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Multiplexing

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Which OSI layer is responsible for bit rate control and transmission mode (simplex, half-duplex, full-duplex)? A. Data Link Layer B. Physical Layer C. Network Layer D. Transport Layer
B · Physical Layer
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How many layers are there in the OSI model? A. 5 B. 6 C. 7 D. 8
C · 7
The OSI model consists of exactly 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. This standard reference model defines network functions.[7]
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Which protocols work on the Internet Layer of the TCP/IP Model?
B · IP and ICMP
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At which layer of the TCP/IP Model do TCP and UDP protocols work?
B · Transport Layer
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How many layers does the TCP/IP model consist of?
C · 4 layers
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Which of the following statements about the TCP/IP model is true?
A · True
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A network topology in which each node has a direct physical connection to every other node is called?
C · C. Mesh
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Which type of network topology provides the highest level of redundancy?
B · B. Mesh
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A network topology where each node connects to a central switching device is known as?
C · C. Star
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How many types of network topologies are there in total?
C · C. 7
There are **7 main types** of network topologies: 1. Point-to-Point, 2. Star, 3. Ring, 4. Mesh, 5. Tree, 6. Bus, 7. Hybrid. These cover physical and logical arrangements in networks.
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Transmission media are usually categorized as ______.
B · guided or unguided
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Narrow-band LAN technology uses _________ mode of transmission.
C · digital
Narrow-band LAN technology uses digital mode of transmission. It carries voice data on limited frequencies in telecommunication systems, based on simplex communication in one direction.
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The sharing of a medium and its link by two or more devices is called?
B · Multiplexing
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There are three basic multiplexing techniques, and they are frequency-division multiplexing, wavelength-division multiplexing and __________ multiplexing.
B · time-division
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Multiplexing in data communications primarily aims at:
C · Efficient utilization of resources
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Which of the following is a drawback of Synchronous TDM?
A · It wastes slots when no data is available
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In Frequency Division Multiplexing (FDM), what is the purpose of guard bands?
A · To separate channels and avoid cross-talk
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Which multiplexing technique is used to transmit digital signals?
B · TDM
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Multiplexing provides:
D · Both Efficiency & Privacy
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Multiplexing is used in:
B · Circuit switching
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What is the primary purpose of the OSI model in computer networks?
A · To provide a framework for network communication by dividing it into layers
The OSI model provides a conceptual framework that standardizes network communication into seven layers, facilitating interoperability and design.
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Which of the following best describes the OSI model?
A · A seven-layer conceptual model for network communication
The OSI model is a seven-layer conceptual model that standardizes communication functions of a telecommunication or computing system.
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Which of the following is NOT a purpose of the OSI model?
B · To provide a universal set of protocols for all networks
The OSI model does not provide a universal set of protocols; it is a conceptual framework. Protocols are defined separately and may vary.
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Refer to the diagram below showing the OSI model layers. Which layer is responsible for establishing, managing, and terminating sessions between applications?
A · Session Layer
The Session Layer manages sessions between applications, including establishing, maintaining, and terminating connections.
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Which OSI layer is responsible for converting data into signals suitable for transmission over a physical medium?
A · Physical Layer
The Physical Layer converts data into electrical, optical, or radio signals for transmission over the physical medium.
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Which OSI layer provides logical addressing and routing of packets across networks?
A · Network Layer
The Network Layer provides logical addressing (such as IP addresses) and routing to deliver packets across different networks.
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Which of the following correctly lists the OSI layers from bottom to top?
A · Physical, Data Link, Network, Transport, Session, Presentation, Application
The OSI layers from bottom to top are: Physical, Data Link, Network, Transport, Session, Presentation, Application.
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Which OSI layer is responsible for end-to-end communication and error recovery?
A · Transport Layer
The Transport Layer provides end-to-end communication, flow control, and error recovery between hosts.
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Which OSI layer is responsible for data encryption, compression, and translation?
A · Presentation Layer
The Presentation Layer handles data format translation, encryption, and compression to ensure data is in a usable format.
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Which of the following functions is NOT performed by the Data Link Layer?
B · Logical addressing
Logical addressing is the responsibility of the Network Layer, not the Data Link Layer.
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In the OSI model, which sub-layer of the Data Link Layer is responsible for controlling how devices gain access to the medium and permission to transmit data?
A · MAC sub-layer
The MAC (Media Access Control) sub-layer controls access to the physical transmission medium and manages permissions to transmit.
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Which of the following is a function of the LLC sub-layer in the Data Link Layer?
A · Providing error and flow control
The LLC (Logical Link Control) sub-layer provides flow control, error control, and multiplexing of protocols.
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Which of the following statements about MAC and LLC sub-layers is TRUE?
A · MAC handles addressing and access control; LLC handles error checking and flow control
MAC sub-layer manages physical addressing and access control, while LLC sub-layer manages error checking and flow control.
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Which device primarily operates at the Network Layer of the OSI model?
A · Router
Routers operate at the Network Layer, handling logical addressing and routing of packets between networks.
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Which protocol operates at the Transport Layer of the OSI model?
A · TCP
TCP (Transmission Control Protocol) operates at the Transport Layer, providing reliable end-to-end communication.
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Which device primarily functions at the Data Link Layer and uses MAC addresses to forward frames?
A · Switch
Switches operate at the Data Link Layer and forward frames based on MAC addresses.
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Refer to the diagram below illustrating the encapsulation process in the OSI model. At which layer is the data unit called a 'segment'?
A · Transport Layer
Data units are called segments at the Transport Layer during encapsulation.
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During the encapsulation process, which OSI layer adds the IP header to the data?
A · Network Layer
The Network Layer adds the IP header to the data, creating a packet.
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Which of the following best describes the decapsulation process in the OSI model?
A · Removing headers and trailers added by each layer as data moves up the stack
Decapsulation involves removing headers and trailers added by each layer during encapsulation as data moves up the OSI layers.
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Which of the following statements correctly compares the OSI and TCP/IP models?
A · OSI has seven layers; TCP/IP has four or five layers
The OSI model has seven layers, while the TCP/IP model typically has four or five layers.
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Refer to the table below comparing OSI and TCP/IP models. Which OSI layer corresponds to the TCP/IP Internet layer?
A · Network Layer
The OSI Network Layer corresponds to the TCP/IP Internet Layer, responsible for logical addressing and routing.
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Which OSI layer(s) correspond(s) to the TCP/IP Application layer?
A · Application, Presentation, and Session Layers
The TCP/IP Application layer encompasses the OSI Application, Presentation, and Session layers.
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Which of the following is a key difference between the OSI and TCP/IP models?
A · OSI is a theoretical model; TCP/IP is a practical protocol suite
The OSI model is a conceptual framework, while TCP/IP is a practical protocol suite used widely in real networks.
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Refer to the diagram below illustrating data flow between OSI layers. Which layer directly interacts with the Physical Layer during data transmission?
A · Data Link Layer
The Data Link Layer interfaces directly with the Physical Layer to transmit frames over the physical medium.
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Which of the following best describes the flow of data in the OSI model during transmission?
A · Data moves from Application layer down to Physical layer for transmission
During transmission, data flows from the Application layer down through each OSI layer to the Physical layer for sending over the medium.
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Which OSI layer is responsible for reassembling data segments into a complete message at the receiving end?
A · Transport Layer
The Transport Layer reassembles segments into the original message and ensures data integrity.
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Which OSI layer commonly uses CRC (Cyclic Redundancy Check) for error detection?
A · Data Link Layer
The Data Link Layer uses CRC to detect errors in frames during transmission.
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Which OSI layer is responsible for end-to-end error recovery and flow control?
A · Transport Layer
The Transport Layer provides end-to-end error recovery and flow control to ensure reliable communication.
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Which of the following error detection methods is typically used by the Data Link Layer's LLC sub-layer?
A · Checksum
The LLC sub-layer uses checksums to detect errors in frames.
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Which OSI layer uses MAC addresses for addressing and routing frames within a local network?
A · Data Link Layer
The Data Link Layer uses MAC addresses to identify devices and route frames within a local network.
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Which OSI layer is responsible for logical addressing and determining the best path for data delivery?
A · Network Layer
The Network Layer assigns logical addresses (IP addresses) and performs routing to deliver packets across networks.
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Which of the following is TRUE regarding addressing in the OSI model?
A · MAC addresses are used at the Data Link Layer; IP addresses are used at the Network Layer
MAC addresses are physical addresses used at the Data Link Layer; IP addresses are logical addresses used at the Network Layer.
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Which OSI layer is responsible for routing decisions based on logical addresses?
A · Network Layer
The Network Layer makes routing decisions using logical addresses such as IP addresses.
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Which of the following is a common misconception about the OSI model?
B · The OSI model is a strict protocol standard implemented in all networks
The OSI model is a conceptual framework, not a strict protocol standard implemented universally.
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Which of the following is an example of a layer violation in the OSI model?
A · A Network Layer device making decisions based on MAC addresses
Network Layer devices should use logical addresses (IP), not MAC addresses, so using MAC addresses at this layer is a layer violation.
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Which of the following scenarios illustrates a violation of the OSI layering principle?
A · An Application Layer protocol directly accessing the Physical Layer hardware
The Application Layer should not directly access Physical Layer hardware; this bypasses the intermediate layers and violates the OSI layering principle.
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Which OSI layer is primarily responsible for establishing, managing, and terminating sessions between applications?
B · Session Layer
The Session Layer (Layer 5) manages sessions between applications, including establishing, maintaining, and terminating connections.
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Which of the following is NOT a function of the Network Layer in the OSI model?
C · Error detection and correction
Error detection and correction is primarily handled by the Data Link Layer, not the Network Layer.
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At which OSI layer is data encrypted and decrypted to provide security services?
A · Presentation Layer
Encryption and decryption of data are functions of the Presentation Layer (Layer 6).
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Refer to the diagram below showing the OSI layer stack. Which layer adds the header containing the logical IP address during encapsulation?
B · Network Layer
The Network Layer adds the header with the logical IP address during encapsulation.
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In the OSI model, which layer is responsible for segmenting data and providing reliable end-to-end communication?
B · Transport Layer
The Transport Layer segments data and provides reliable end-to-end communication using mechanisms like acknowledgments and retransmissions.
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Which of the following best describes the process of encapsulation in the OSI model?
A · Adding headers and trailers to data as it moves down the layers
Encapsulation involves adding headers (and sometimes trailers) to data as it passes down through the OSI layers.
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Which OSI layer corresponds to the Internet layer in the TCP/IP model?
B · Network Layer
The Network Layer in OSI corresponds to the Internet layer in the TCP/IP model, responsible for logical addressing and routing.
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Which OSI layer combines the functions of the OSI Session, Presentation, and Application layers in the TCP/IP model?
D · Application Layer
The TCP/IP Application Layer combines the OSI model's Session, Presentation, and Application layers.
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Refer to the protocol stack comparison chart below. Which TCP/IP layer corresponds to the OSI Data Link and Physical layers combined?
A · Network Interface Layer
The TCP/IP Network Interface Layer corresponds to both the OSI Data Link and Physical layers.
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Which sub-layer of the Data Link Layer is responsible for controlling how devices access the medium and share it?
B · Media Access Control (MAC)
The MAC sub-layer controls access to the physical transmission medium and manages channel sharing.
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Which sub-layer of the Data Link Layer provides error checking and framing services to the Network Layer?
A · Logical Link Control (LLC)
The LLC sub-layer provides error control, flow control, and framing services to the Network Layer.
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Refer to the diagram below illustrating the Data Link Layer sub-layers. Which sub-layer handles physical addressing and frame delimiting?
B · Media Access Control (MAC)
The MAC sub-layer handles physical addressing (MAC addresses) and frame delimiting.
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Which OSI layer is responsible for converting data into signals suitable for transmission over the physical medium?
A · Physical Layer
The Physical Layer converts bits into electrical, optical, or radio signals for transmission.
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Which OSI layer ensures reliable data transfer by providing error recovery and flow control?
B · Transport Layer
The Transport Layer provides reliable data transfer with error recovery and flow control mechanisms.
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Refer to the diagram below showing the data flow from sender to receiver. At which OSI layer is the data segmented into smaller units called segments?
A · Transport Layer
Segmentation of data into segments occurs at the Transport Layer.
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Which device operates primarily at the OSI Network Layer to forward packets based on logical addressing?
B · Router
Routers operate at the Network Layer and forward packets based on IP addresses.
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Which protocol operates at the Transport Layer and provides connection-oriented communication with flow control and error recovery?
B · TCP
TCP (Transmission Control Protocol) operates at the Transport Layer and provides reliable, connection-oriented communication.
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Refer to the diagram below showing devices and protocols mapped to OSI layers. Which device is correctly matched with the Data Link Layer?
A · Switch
Switches operate primarily at the Data Link Layer to forward frames based on MAC addresses.
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Which error detection method is commonly used at the Data Link Layer to detect corrupted frames?
C · Cyclic Redundancy Check (CRC)
CRC is widely used at the Data Link Layer for error detection in frames.
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Which OSI layer typically implements error correction through retransmission and acknowledgments?
D · Transport Layer
The Transport Layer implements error correction using retransmissions and acknowledgments for reliable delivery.
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Refer to the diagram below illustrating error detection and correction. Which layer is responsible for detecting errors using CRC and requesting retransmission if needed?
A · Data Link Layer
The Data Link Layer detects errors using CRC and can request retransmission of corrupted frames.
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Which OSI layer uses flow control techniques such as sliding window to prevent overwhelming the receiver?
C · Transport Layer
The Transport Layer uses flow control mechanisms like sliding window to regulate data flow between sender and receiver.
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Which OSI layer is responsible for congestion control to avoid network overload?
B · Transport Layer
The Transport Layer implements congestion control mechanisms to prevent network congestion.
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Refer to the diagram below showing flow control in the sliding window protocol. What happens when the receiver's window is full?
B · Sender stops sending frames until window opens
When the receiver's window is full, the sender must stop sending frames until the receiver processes some frames and opens the window.
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Which addressing scheme is used at the OSI Network Layer for identifying devices across different networks?
B · IP Address
The Network Layer uses logical IP addressing to identify devices across networks.
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Which type of address is used at the Data Link Layer to identify devices on the same local network segment?
B · MAC Address
MAC addresses are used at the Data Link Layer to identify devices within the same local network.
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Refer to the addressing scheme illustration below. Which address type is represented by the 16-bit number used to identify a specific application process on a host?
C · Port Number
Port numbers identify specific application processes and are used at the Transport Layer.
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Which of the following is a common misconception about the OSI model?
A · The Physical Layer handles error correction
Error correction is mainly handled by the Data Link and Transport Layers, not the Physical Layer.
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Which of the following incorrect layer-function mappings is commonly made by students?
D · Physical Layer - Routing
Routing is a Network Layer function, not a Physical Layer function.
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Refer to the diagram below showing incorrect layer-function mappings. Which pair is INCORRECT?
C · Physical Layer - Logical addressing
Logical addressing is a Network Layer function, not Physical Layer.
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Which of the following best describes the TCP/IP model?
B · A practical suite of protocols used for internetworking
The TCP/IP model is a practical suite of protocols designed for internetworking and forms the basis of the Internet.
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The primary purpose of the TCP/IP model is to:
B · Provide a layered framework for communication protocols
TCP/IP provides a layered framework that standardizes communication protocols to enable interoperability across diverse networks.
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Which of the following statements about the TCP/IP model is TRUE?
B · It was developed before the OSI model
The TCP/IP model was developed before the OSI model and has four layers, unlike OSI's seven layers.
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Refer to the diagram below showing the layers of the TCP/IP model. Which layer is responsible for establishing, managing, and terminating connections?
C · Transport Layer
The Transport Layer manages end-to-end communication, including connection establishment, management, and termination.
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Which layer of the TCP/IP model corresponds to the OSI Network Layer?
B · Internet Layer
The Internet Layer in TCP/IP corresponds to the Network Layer in the OSI model and handles logical addressing and routing.
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Which of the following is NOT a layer in the TCP/IP model?
B · Session Layer
The Session Layer is part of the OSI model but does not exist as a separate layer in the TCP/IP model.
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In the TCP/IP model, which layer is responsible for physical addressing and framing?
B · Network Interface Layer
The Network Interface Layer handles physical addressing (MAC addresses) and framing for data transmission over the physical medium.
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Refer to the diagram below comparing the OSI and TCP/IP models. Which TCP/IP layer combines the functionalities of OSI's Session, Presentation, and Application layers?
C · Application Layer
The TCP/IP Application Layer encompasses the OSI model's Session, Presentation, and Application layers.
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Which of the following is a key difference between the TCP/IP and OSI models?
B · OSI model is protocol-independent, TCP/IP is protocol-specific
The OSI model is a conceptual framework independent of protocols, while TCP/IP is a protocol suite designed for practical implementation.
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Which layer in the TCP/IP model is responsible for logical addressing and routing?
C · Internet Layer
The Internet Layer handles logical addressing (IP addresses) and routing of packets across networks.
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Which function is NOT performed by the Transport Layer in the TCP/IP model?
C · Routing of packets between networks
Routing is handled by the Internet Layer, not the Transport Layer.
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Refer to the diagram below illustrating the TCP/IP layers and their functions. Which layer is responsible for providing end-to-end communication services for applications?
C · Transport Layer
The Transport Layer provides end-to-end communication services such as connection management and reliability.
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Which protocol is associated with the Transport Layer of the TCP/IP model?
B · TCP
TCP (Transmission Control Protocol) operates at the Transport Layer providing reliable communication.
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Which protocol is primarily used at the Internet Layer in the TCP/IP model?
C · IP
IP (Internet Protocol) is the main protocol at the Internet Layer responsible for logical addressing and routing.
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Which of the following protocols operates at the Application Layer of the TCP/IP model?
A · SMTP
SMTP (Simple Mail Transfer Protocol) is an Application Layer protocol used for email transmission.
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Which protocol is used for address resolution at the Network Interface Layer?
A · ARP
ARP (Address Resolution Protocol) resolves IP addresses to MAC addresses at the Network Interface Layer.
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Refer to the diagram below showing the encapsulation process in the TCP/IP model. What is the correct order of headers added from top to bottom?
A · Application, Transport, Internet, Network Interface
Data is encapsulated by adding headers in the order: Application, Transport, Internet, and then Network Interface.
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During data encapsulation in the TCP/IP model, which layer adds the IP header?
C · Internet Layer
The Internet Layer adds the IP header which contains logical addressing information.
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Which of the following best describes the data flow process in the TCP/IP model during transmission?
B · Data is encapsulated at each layer starting from Application down to Network Interface
Data is encapsulated at each layer starting from the Application Layer down to the Network Interface Layer before transmission.
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Refer to the diagram below illustrating IP addressing and routing. Which device is responsible for forwarding packets based on IP addresses?
B · Router
Routers forward packets based on IP addresses at the Internet Layer.
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Which of the following IP addresses is a valid IPv4 address?
B · 10.0.0.1
10.0.0.1 is a valid IPv4 address; the other options have octets exceeding 255.
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Which routing protocol is commonly used in TCP/IP networks for exchanging routing information within an autonomous system?
B · OSPF
OSPF (Open Shortest Path First) is a common interior gateway protocol used within an autonomous system.
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Refer to the routing schematic below. If Router A receives a packet destined for 192.168.2.10, which interface should it forward the packet to based on the routing table?
B · Interface 2 (192.168.2.0/24)
The destination IP 192.168.2.10 falls within the 192.168.2.0/24 subnet, so the packet should be forwarded via Interface 2.
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Which mechanism is used by TCP to ensure reliable data transfer?
A · Sequence numbers and acknowledgments
TCP uses sequence numbers and acknowledgments to track data delivery and retransmit lost packets.
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Which flow control technique is used by TCP to prevent the sender from overwhelming the receiver?
A · Sliding window protocol
TCP uses the sliding window protocol to manage flow control between sender and receiver.
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Which protocol is used for error reporting and diagnostic functions in the TCP/IP suite?
A · ICMP
ICMP (Internet Control Message Protocol) is used for error reporting and diagnostics such as ping.
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Refer to the diagram below showing TCP flow control using sliding windows. If the receiver advertises a window size of 5000 bytes, what does this indicate?
A · The sender can send up to 5000 bytes before waiting for acknowledgment
The advertised window size tells the sender how much data it can send before receiving an acknowledgment.
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Which of the following applications uses the TCP protocol for reliable data transmission?
A · HTTP
HTTP uses TCP to ensure reliable transmission of web data.
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Which application layer protocol is used for transferring files over a TCP/IP network?
A · FTP
FTP (File Transfer Protocol) operates at the Application Layer and uses TCP for file transfers.
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Which of the following protocols is connectionless and used by applications requiring fast transmission without reliability?
B · UDP
UDP (User Datagram Protocol) is connectionless and used when speed is preferred over reliability.
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Which layer of the TCP/IP model is responsible for providing end-to-end communication and reliable data transfer?
C · Transport Layer
The Transport Layer in the TCP/IP model provides end-to-end communication and ensures reliable data transfer using protocols like TCP.
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Which of the following is NOT a function of the Application Layer in the TCP/IP model?
C · Routing packets between networks
Routing packets between networks is a function of the Internet Layer, not the Application Layer.
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In the TCP/IP model, which layer corresponds to the OSI model's Data Link and Physical layers combined?
B · Network Interface Layer
The Network Interface Layer in TCP/IP corresponds to the OSI model's Data Link and Physical layers.
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Refer to the diagram below showing the TCP/IP and OSI models side by side. Which TCP/IP layer combines the functionalities of the OSI model's Session, Presentation, and Application layers?
C · Application Layer
The TCP/IP Application Layer encompasses the OSI model's Session, Presentation, and Application layers.
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Which of the following is a key difference between the TCP/IP and OSI models?
D · TCP/IP has fewer layers and combines some OSI layers
The TCP/IP model has fewer layers and combines some OSI layers, such as combining the OSI’s Session, Presentation, and Application layers into one Application layer.
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Which protocol operates at the Internet Layer of the TCP/IP model and is responsible for logical addressing and routing?
B · IP
The Internet Protocol (IP) operates at the Internet Layer and handles logical addressing and routing of packets.
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Which protocol is NOT part of the TCP/IP Transport Layer?
C · ICMP
ICMP operates at the Internet Layer, not the Transport Layer.
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Which of the following protocols is used for resolving IP addresses to MAC addresses in a local network?
B · ARP
Address Resolution Protocol (ARP) resolves IP addresses to MAC addresses within a local network.
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Refer to the diagram below illustrating encapsulation in the TCP/IP model. Which header is added immediately after the Transport Layer data?
B · Internet Layer Header
After the Transport Layer data, the Internet Layer header (such as IP header) is added during encapsulation.
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What is the correct order of encapsulation from top to bottom in the TCP/IP model?
B · Application, Transport, Internet, Network Interface
Data flows from Application to Transport to Internet to Network Interface layers during encapsulation.
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Which addressing scheme is used at the Internet Layer of the TCP/IP model?
B · IP Address
IP addressing is used at the Internet Layer for logical addressing and routing.
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Refer to the routing path diagram below. If a packet originates from Host A and is destined for Host D, which router will perform the first routing decision?
A · Router R1
Router R1 is the first router the packet encounters and will make the first routing decision.
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Which of the following is TRUE about TCP compared to UDP?
B · TCP provides reliable data transfer, UDP does not
TCP provides reliable, connection-oriented data transfer, while UDP is connectionless and does not guarantee delivery.
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Which TCP feature ensures that data is received in the same order it was sent?
B · Sequencing
Sequencing ensures that TCP segments are reassembled in the correct order at the receiver.
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Which of the following is NOT a flow control mechanism used in TCP?
C · Checksum
Checksum is used for error detection, not flow control.
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Refer to the packet structure diagram below. Which field in the TCP header is used to verify data integrity?
B · Checksum
The Checksum field is used to verify the integrity of the TCP segment.
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Which security protocol provides encryption and authentication at the Internet Layer in TCP/IP?
B · IPsec
IPsec operates at the Internet Layer to provide encryption and authentication.
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Which of the following is a common vulnerability in TCP/IP networks related to IP addressing?
A · IP Spoofing
IP Spoofing involves forging the source IP address to masquerade as another system.
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Which application protocol uses TCP port 25 by default?
C · SMTP
SMTP (Simple Mail Transfer Protocol) uses TCP port 25 for sending emails.
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Which of the following services is NOT typically associated with the TCP/IP Application Layer?
C · IPsec
IPsec is a security protocol at the Internet Layer, not an Application Layer service.
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Which of the following best describes the function of the Window Size field in the TCP header?
B · Specifies the amount of data the sender is willing to receive
The Window Size field specifies the amount of data the sender is willing to receive, enabling flow control.
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Which of the following protocols is connectionless and does NOT guarantee delivery of packets?
B · UDP
UDP is a connectionless protocol that does not guarantee delivery or order of packets.
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Which TCP mechanism helps to avoid congestion in the network?
A · Slow Start
Slow Start is a TCP congestion control mechanism to avoid network congestion.
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Refer to the diagram below showing the encapsulation process in TCP/IP. Which layer adds the MAC address to the frame?
D · Network Interface Layer
The Network Interface Layer adds the MAC address in the frame header for delivery on the local network.
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Which of the following is NOT a header field in the IPv4 packet structure?
C · Sequence Number
Sequence Number is a field in the TCP header, not in the IPv4 header.
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Which of the following best describes ARP spoofing attack in TCP/IP networks?
B · Sending fake ARP messages to associate attacker’s MAC with victim’s IP
ARP spoofing involves sending fake ARP messages to associate the attacker’s MAC address with the IP address of another host.
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Which protocol provides secure remote login and command execution over an unsecured network using TCP/IP?
B · SSH
SSH (Secure Shell) provides encrypted remote login and command execution.
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Which of the following TCP header fields is used to acknowledge receipt of data?
B · Acknowledgment Number
The Acknowledgment Number field indicates the next expected byte from the sender, acknowledging receipt.
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Which protocol is used to translate domain names into IP addresses in the TCP/IP suite?
B · DNS
DNS (Domain Name System) translates domain names to IP addresses.
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Which of the following is TRUE about UDP compared to TCP?
B · UDP is faster due to lack of connection establishment
UDP is faster than TCP because it does not establish a connection or provide reliability mechanisms.
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Refer to the diagram below showing a TCP three-way handshake. What is the correct sequence of messages exchanged between client and server?
A · SYN, SYN-ACK, ACK
The three-way handshake sequence is SYN from client, SYN-ACK from server, and ACK from client.
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Which of the following is NOT a feature of the Internet Layer in the TCP/IP model?
C · Error detection and correction
Error detection and correction is primarily handled at the Transport and Network Interface layers, not the Internet Layer.
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Which of the following protocols is used for error reporting and diagnostic functions in TCP/IP networks?
A · ICMP
ICMP (Internet Control Message Protocol) is used for error reporting and diagnostics.
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Which TCP/IP layer is responsible for converting data into electrical signals for transmission over physical media?
D · Network Interface Layer
The Network Interface Layer handles physical transmission including conversion to electrical signals.
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Which of the following is an example of a connectionless protocol in the TCP/IP suite?
B · UDP
UDP is a connectionless protocol that does not establish a connection before sending data.
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Which of the following TCP/IP layers is responsible for host-to-host communication and multiplexing?
B · Transport Layer
The Transport Layer provides host-to-host communication and multiplexing using port numbers.
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Which of the following is NOT a typical use of the TCP/IP Application Layer?
C · Routing packets
Routing packets is handled by the Internet Layer, not the Application Layer.
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Which of the following fields in the IPv4 header specifies how many hops a packet can traverse before being discarded?
B · Time to Live (TTL)
TTL limits the lifespan of a packet to prevent it from circulating indefinitely.
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Which of the following best describes the function of the three-way handshake in TCP?
A · To establish a reliable connection between sender and receiver
The three-way handshake establishes a reliable connection before data transfer.
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Which of the following is NOT a security feature provided by IPsec in the TCP/IP suite?
D · Application layer encryption
IPsec operates at the Internet Layer and does not provide application layer encryption.
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What is the primary purpose of a network topology in computer networks?
A · To define the physical and logical arrangement of network devices
Network topology defines how devices are physically or logically arranged and connected in a network, which affects communication and management.
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Which of the following best describes a network topology?
B · The layout pattern of interconnections between nodes in a network
Network topology refers to the layout pattern of how nodes and devices are interconnected physically or logically.
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Which of the following is NOT a reason for choosing a specific network topology?
C · Color of the network cables
The color of network cables does not influence the choice of network topology; factors like cost, manageability, scalability, and fault tolerance are important.
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Which topology connects all devices to a single central device, typically a hub or switch?
B · Star topology
In star topology, all devices connect to a central hub or switch, which manages data traffic.
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In which network topology are devices connected in a closed loop, where each device has exactly two neighbors?
C · Ring topology
Ring topology connects devices in a circular fashion, where each device connects to two others forming a closed loop.
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Refer to the diagram below showing a network layout. Which topology is represented here?
B · Star topology
The diagram shows multiple devices connected to a single central node, which is characteristic of a star topology.
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Which topology is most suitable for a network requiring high fault tolerance and redundancy?
C · Mesh topology
Mesh topology provides multiple paths between devices, offering high fault tolerance and redundancy.
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Which of the following is a disadvantage of bus topology?
B · Difficult to add new devices without disrupting the network
In bus topology, adding new devices can disrupt the network because all devices share a common communication line.
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Which topology is characterized by a single point of failure that can bring down the entire network?
A · Star topology
In star topology, the central device is a single point of failure; if it fails, the entire network is affected.
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Which topology provides the best scalability but may have higher cabling costs?
D · Star topology
Star topology is scalable as devices can be added easily, but requires more cabling compared to bus or ring topologies.
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Refer to the diagram below. Which topology is illustrated and what is its main disadvantage?
B · Ring topology; failure of one node affects entire network
The diagram shows a ring topology where each node connects to two others forming a loop. A failure in one node or link can disrupt the entire network.
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Which of the following correctly differentiates physical and logical topology?
B · Physical topology shows cable layout; logical topology shows data flow
Physical topology refers to the actual physical layout of cables and devices, while logical topology refers to the way data flows within the network.
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Refer to the diagram below showing two network layouts. Which one represents the logical topology if the physical layout is a star?
A · The star layout is physical; the bus layout is logical
The diagram shows a physical star topology with devices connected to a central node, while the logical topology is a bus where data flows along a single communication line.
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Which statement is TRUE regarding physical and logical topologies?
B · Logical topology defines the data transmission path regardless of physical layout
Logical topology defines how data flows in the network, which may differ from the physical arrangement of devices and cables.
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Which of the following is a key criterion when selecting a network topology for an organization?
B · The number of users and required scalability
Number of users and scalability needs are critical factors in choosing an appropriate network topology.
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Which topology is most suitable for a small office network requiring easy management and low cost?
C · Bus topology
Bus topology is cost-effective and simple to implement for small networks but has limitations in scalability and fault tolerance.
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Refer to the diagram below of a hybrid network topology. Which two topologies are combined here?
A · Star and bus topologies
The diagram shows a star topology connected to a bus topology, forming a hybrid topology.
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What is a major advantage of hybrid topology over simple topologies?
B · It combines strengths and mitigates weaknesses of multiple topologies
Hybrid topology integrates multiple topologies to leverage their advantages and reduce individual limitations.
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Which of the following is a challenge when implementing hybrid topologies?
B · Increased complexity and cost
Hybrid topologies can be complex to design and manage, leading to higher costs.
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Which topology generally offers the best fault tolerance due to multiple redundant paths?
D · Mesh topology
Mesh topology provides multiple redundant paths between nodes, enhancing fault tolerance.
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Which topology is most scalable but may suffer from performance degradation as the number of nodes increases?
A · Bus topology
Bus topology is scalable to an extent, but performance degrades as more devices share the same communication medium.
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Which topology is preferred in environments where performance and scalability are critical, and cost is less of a concern?
C · Mesh topology
Mesh topology supports high performance and scalability due to multiple direct links, though it is costly.
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What is the primary purpose of implementing a network topology in computer networks?
A · To define the physical layout of devices and connections
Network topology defines how devices are physically or logically arranged and connected in a network, which helps in designing and managing the network.
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Which of the following best describes a network topology?
B · The arrangement of network devices and their interconnections
Network topology refers to the arrangement or layout of devices and how they are interconnected in a network.
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How does the choice of network topology influence network design?
B · It determines the physical placement and communication paths of devices
The topology determines how devices are connected and communicate, influencing performance, fault tolerance, and scalability.
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Refer to the diagram below showing a Bus topology. Which statement correctly describes this topology?
C · All devices share a common communication line
In a Bus topology, all devices share a single communication line or backbone for data transmission.
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Which topology connects all devices to a central node, and if the central node fails, the entire network is affected?
B · Star topology
In a Star topology, all devices connect to a central hub or switch. Failure of this central node disrupts the entire network.
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In which topology are devices connected in a closed loop, where each device has exactly two neighbors?
C · Ring
Ring topology connects devices in a circular fashion, each device connected to two others forming a closed loop.
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Which topology provides the highest fault tolerance by having multiple redundant paths between devices?
C · Mesh
Mesh topology connects each device to multiple others, providing multiple paths and high fault tolerance.
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Which of the following is a characteristic of a Tree topology?
B · Hierarchical structure combining characteristics of Star and Bus topologies
Tree topology is hierarchical, combining Star topology’s central nodes with Bus topology’s linear connections.
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Refer to the diagram below showing a Hybrid topology. Which statement is true about this topology?
A · It is a combination of two or more different topologies
Hybrid topology integrates two or more different topologies to leverage their advantages and minimize disadvantages.
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Which topology is most vulnerable to a single point of failure disrupting the entire network?
C · Bus
In Bus topology, failure of the main communication line (bus) causes the entire network to fail.
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What is a major advantage of Star topology compared to Bus topology?
B · Easier fault isolation and troubleshooting
Star topology allows easy identification and isolation of faults because each device connects individually to the central node.
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Which topology offers the best fault tolerance but is often expensive and complex to implement?
C · Mesh
Mesh topology provides multiple redundant paths, enhancing fault tolerance but requiring more cabling and configuration.
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Refer to the diagram below comparing Star and Ring topologies. Which topology is more scalable for adding new devices without disrupting the network?
B · Star topology
Star topology allows easy addition of devices by connecting them to the central hub without affecting others, unlike Ring topology which requires breaking the loop.
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Which of the following best distinguishes physical topology from logical topology?
B · Physical topology shows device layout; logical topology shows data flow
Physical topology refers to the actual physical layout of devices and cables, while logical topology describes how data flows within the network.
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Refer to the diagram below showing physical and logical topologies of a network. Which statement is correct?
A · Physical topology is a Star; logical topology is a Bus
The diagram shows devices physically connected in a Star pattern but data flows logically in a Bus manner.
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Which of the following is TRUE about logical topology in a network?
B · It defines the path that data takes between devices
Logical topology describes how data flows through the network, which may differ from the physical connections.
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Which scenario best illustrates a difference between physical and logical topologies?
A · Devices physically connected in a Star, but data flows in a Ring
Physical and logical topologies can differ; for example, devices physically connected in Star can logically communicate in a Ring pattern.
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How does network topology affect fault tolerance in a network?
A · Topologies with redundant paths improve fault tolerance
Topologies like Mesh with multiple redundant paths allow the network to continue functioning even if some links fail, enhancing fault tolerance.
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Refer to the diagram below showing a Mesh and a Bus topology. Which topology will provide better fault tolerance and why?
B · Mesh, because it has multiple redundant paths
Mesh topology provides multiple paths between devices, so failure of one link does not disrupt the network, improving fault tolerance.
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Which topology is likely to have the highest network latency due to data passing through multiple devices before reaching its destination?
C · Ring
In Ring topology, data passes sequentially through multiple devices, potentially increasing latency.
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Which factor is NOT typically considered when selecting a network topology based on network size and application?
C · Color of network devices
Color of devices is irrelevant; cost, scalability, and fault tolerance are key criteria for topology selection.
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For a small office network requiring easy maintenance and moderate cost, which topology is most suitable?
B · Star
Star topology is cost-effective, easy to maintain, and suitable for small to medium-sized networks.
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Refer to the diagram below showing a Tree topology used in a campus network. Why is this topology preferred for large networks?
A · It provides hierarchical scalability and easy fault isolation
Tree topology supports hierarchical growth and allows faults to be isolated within branches, making it ideal for large networks.
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Which real-world application commonly uses a Star topology?
A · Home Wi-Fi networks with a central router
Home Wi-Fi networks typically use a Star topology where devices connect to a central router.
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Which topology is often used in metropolitan area networks (MANs) due to its fault tolerance and redundancy?
B · Mesh
Mesh topology is preferred in MANs for its multiple redundant paths and high reliability.
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Refer to the diagram below showing a Ring topology used in a token ring network. What is a key advantage of this topology in such networks?
A · Data packets travel in one direction, reducing collisions
Token Ring networks use Ring topology where data circulates in one direction, minimizing collisions.
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Which topology generally has the lowest initial installation cost but is less scalable and fault tolerant?
B · Bus
Bus topology requires less cabling and hardware initially but is less scalable and vulnerable to failures.
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Which topology is easiest to maintain and troubleshoot but may have higher cabling costs compared to Bus topology?
A · Star
Star topology simplifies maintenance and troubleshooting due to centralized connections but requires more cabling.
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Refer to the table below comparing cost, scalability, and maintenance of Bus, Star, and Mesh topologies. Which topology offers the best scalability but at the highest cost?
C · Mesh
Mesh topology offers excellent scalability and fault tolerance but is expensive due to extensive cabling and hardware.
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Which topology requires the least amount of cabling but is most affected by a single cable failure?
B · Bus
Bus topology uses a single backbone cable; if it fails, the entire network is affected.
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Which of the following is the correct classification of transmission media?
A · Guided media and Unguided media
Transmission media are broadly classified into guided media, where signals are confined to a physical path, and unguided media, where signals are transmitted through the air or space.
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Which of the following is NOT a guided transmission medium?
D · Radio Waves
Radio waves are an example of unguided media as they propagate through the air without a physical conductor.
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Which statement best describes the difference between guided and unguided media?
A · Guided media transmit signals through physical paths, while unguided media transmit signals through free space.
Guided media use physical conductors like cables to direct signals, whereas unguided media transmit signals through the atmosphere or space without physical conductors.
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Which of the following is a characteristic feature of twisted pair cables?
B · Consists of two insulated copper wires twisted together
Twisted pair cables consist of two insulated copper wires twisted around each other to reduce electromagnetic interference.
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Which guided media type offers the highest bandwidth and lowest attenuation?
C · Optical Fiber
Optical fiber uses light signals, which provide very high bandwidth and low attenuation compared to copper-based cables.
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Which of the following correctly matches the guided media with its typical use?
B · Coaxial Cable - Cable TV networks
Coaxial cable is commonly used in cable TV networks due to its shielding and bandwidth capabilities.
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Refer to the diagram below showing the structure of a coaxial cable. Which part acts as the shield to reduce electromagnetic interference?
C · Metallic outer conductor (shield)
The metallic outer conductor or shield in a coaxial cable protects the inner conductor from electromagnetic interference.
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Which unguided transmission medium uses infrared light for communication?
C · Infrared
Infrared communication uses infrared light waves, typically for short-range communication such as remote controls and some wireless devices.
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Which of the following is a correct characteristic of microwave transmission?
A · Requires line-of-sight between transmitter and receiver
Microwaves require line-of-sight paths because they travel in straight lines and cannot bend around obstacles easily.
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Which unguided medium is most suitable for long-distance satellite communication?
C · Microwaves
Microwaves are used for satellite communication due to their ability to penetrate the atmosphere and carry high-frequency signals over long distances.
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Refer to the diagram below showing frequency ranges of unguided media. Which frequency band corresponds to radio waves?
C · 3 kHz to 300 MHz
Radio waves typically occupy the frequency range from 3 kHz to 300 MHz.
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Which characteristic of transmission media refers to the range of frequencies it can carry?
B · Bandwidth
Bandwidth is the range of frequencies that a transmission medium can carry effectively.
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Which of the following causes signal degradation by reducing signal strength over distance?
B · Attenuation
Attenuation refers to the loss of signal strength as it travels through the transmission medium.
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Which type of noise is caused by random fluctuations in the electrical signal?
B · Thermal noise
Thermal noise is caused by the random motion of electrons in a conductor and affects all electronic devices.
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Propagation delay in a transmission medium is primarily influenced by:
B · Distance and speed of signal propagation
Propagation delay depends on the distance the signal travels and the speed at which it propagates through the medium.
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Refer to the comparison table below. Which transmission medium offers the lowest attenuation and highest bandwidth?
C · Optical Fiber
Optical fiber has the lowest attenuation and highest bandwidth compared to copper-based media and wireless media.
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Which of the following is an advantage of optical fiber over coaxial cable?
B · Higher immunity to electromagnetic interference
Optical fiber is immune to electromagnetic interference because it uses light signals instead of electrical signals.
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Which transmission medium is most suitable for a noisy industrial environment?
C · Optical Fiber
Optical fiber is immune to electromagnetic noise, making it ideal for noisy industrial environments.
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Refer to the table below comparing transmission media. Which medium has the highest susceptibility to interference?
A · Twisted Pair
Twisted pair cables are more susceptible to electromagnetic interference compared to coaxial cable and optical fiber.
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Which physical property helps reduce crosstalk in twisted pair cables?
B · Twisting of wires
Twisting the wires reduces electromagnetic interference and crosstalk between adjacent pairs.
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Which of the following physical properties primarily affects signal propagation speed in a medium?
A · Dielectric constant
The dielectric constant of the insulating material affects the speed at which signals propagate through the medium.
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Which shielding type provides the best protection against electromagnetic interference?
B · Braided shielding
Braided shielding provides better coverage and flexibility, offering superior protection against interference.
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Refer to the signal propagation diagram below. Which factor is responsible for the bending of signal paths in guided media?
B · Refraction
Refraction causes the bending of signals when they pass through different media, which is utilized in optical fibers.
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Which transmission mode allows data transmission in both directions simultaneously?
C · Full-duplex
Full-duplex mode allows simultaneous two-way communication between devices.
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In which transmission mode can data flow in only one direction at a time, but both directions are possible alternately?
B · Half-duplex
Half-duplex allows communication in both directions, but only one direction at a time.
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Which transmission mode is used in keyboard to CPU communication where data flows only from keyboard to CPU?
A · Simplex
Simplex mode allows data transmission in only one direction, such as from keyboard to CPU.
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Which of the following criteria is MOST important when selecting transmission media for a high-speed data center network?
B · Bandwidth and attenuation
High-speed networks require media with high bandwidth and low attenuation to maintain signal quality over distances.
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For a wireless sensor network deployed in a forested area, which transmission medium selection criterion is most critical?
B · Resistance to environmental interference
Environmental interference such as foliage and weather affects wireless signals, so resistance to interference is critical.
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Refer to the network topology diagram below. Which transmission medium is most suitable for connecting the central office to remote branch offices over 50 km?
C · Optical Fiber
Optical fiber supports long-distance communication with low attenuation, making it suitable for 50 km links.
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What is the primary purpose of multiplexing in communication systems?
B · To combine multiple signals for transmission over a single medium
Multiplexing allows multiple signals to share a single communication channel, increasing efficiency by combining them for simultaneous transmission.
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Which of the following best defines multiplexing?
B · A method to combine multiple signals into one signal over a shared medium
Multiplexing is the process of combining multiple signals into one signal for transmission over a shared medium.
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How does multiplexing improve the utilization of communication channels?
B · By allowing multiple signals to share the same channel simultaneously or sequentially
Multiplexing enables multiple signals to share the same channel either simultaneously or in time slots, improving channel utilization.
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Which of the following is NOT a type of multiplexing?
C · Packet Switching Multiplexing (PSM)
Packet Switching Multiplexing (PSM) is not a recognized multiplexing technique; the others are standard multiplexing types.
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Which multiplexing technique divides the available bandwidth into frequency bands for each signal?
B · Frequency Division Multiplexing (FDM)
Frequency Division Multiplexing (FDM) allocates separate frequency bands to each signal within the available bandwidth.
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Which of the following correctly lists multiplexing techniques that use time as a resource?
B · TDM and STDM
Time Division Multiplexing (TDM) and Statistical Time Division Multiplexing (STDM) allocate time slots to signals for transmission.
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Which multiplexing technique uses unique codes to separate signals transmitted over the same frequency band?
C · Code Division Multiplexing (CDM)
Code Division Multiplexing (CDM) assigns unique codes to each signal allowing them to share the same frequency band simultaneously.
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Which of the following is a characteristic of Statistical Time Division Multiplexing (STDM) compared to TDM?
B · STDM dynamically allocates time slots based on demand
STDM dynamically assigns time slots to users based on their data transmission needs, unlike TDM which uses fixed time slots.
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Refer to the diagram below showing frequency bands allocated to different signals. Which multiplexing technique does this diagram represent?
B · Frequency Division Multiplexing (FDM)
The diagram shows separate frequency bands allocated to different signals, characteristic of Frequency Division Multiplexing.
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Which of the following is a disadvantage of Frequency Division Multiplexing (FDM)?
B · Susceptible to crosstalk and intermodulation noise
FDM is prone to crosstalk and intermodulation noise due to overlapping frequency bands if not properly filtered.
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In Frequency Division Multiplexing, what is the purpose of guard bands?
B · To separate adjacent frequency bands and prevent interference
Guard bands are small frequency gaps between channels to prevent overlap and interference in FDM.
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Which of the following best describes the working of Time Division Multiplexing (TDM)?
B · Multiple signals share the same frequency but transmit in different time slots
TDM divides time into slots and assigns each signal a specific time slot for transmission over the same frequency.
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Refer to the time slot allocation chart below. Which multiplexing technique is illustrated?
B · Time Division Multiplexing (TDM)
The chart shows different signals assigned to sequential time slots, characteristic of TDM.
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Which of the following is a limitation of Time Division Multiplexing (TDM)?
B · Inefficient when some channels have no data to transmit during their time slots
TDM allocates fixed time slots whether or not data is present, leading to inefficient bandwidth use if some channels are idle.
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In TDM, what is the role of synchronization between sender and receiver?
B · To ensure receiver knows the start and end of each time slot
Synchronization ensures the receiver correctly identifies the boundaries of each time slot to demultiplex signals accurately.
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Which multiplexing technique is commonly used in optical fiber communication to increase capacity by using different wavelengths?
C · Wavelength Division Multiplexing (WDM)
Wavelength Division Multiplexing (WDM) uses multiple wavelengths (colors) of light to transmit several signals simultaneously over a single optical fiber.
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Refer to the wavelength allocation diagram below. What does this diagram illustrate?
C · Wavelength Division Multiplexing (WDM)
The diagram shows multiple distinct wavelengths allocated to different signals, characteristic of WDM.
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Which of the following is an advantage of Wavelength Division Multiplexing (WDM)?
B · Allows multiple optical signals to be transmitted simultaneously without interference
WDM allows multiple optical signals at different wavelengths to be transmitted simultaneously over the same fiber without interference.
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Which of the following is a challenge when implementing Wavelength Division Multiplexing (WDM)?
B · Complexity in managing multiple wavelengths and their precise alignment
WDM requires precise control and alignment of multiple wavelengths, making hardware complex and costly.
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Code Division Multiplexing (CDM) separates signals based on:
C · Unique codes assigned to each signal allowing simultaneous transmission
CDM uses unique codes to encode each signal, allowing multiple signals to be transmitted simultaneously over the same frequency band.
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Which of the following is a key advantage of Code Division Multiplexing (CDM)?
B · High resistance to interference and eavesdropping
CDM provides good resistance to interference and is difficult to intercept due to unique coding of signals.
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In CDM, what is the role of orthogonal codes?
B · To prevent interference by ensuring codes do not overlap
Orthogonal codes ensure that signals encoded with different codes do not interfere with each other, enabling simultaneous transmission.
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Which of the following is a disadvantage of Code Division Multiplexing (CDM)?
A · Requires complex encoding and decoding hardware
CDM requires complex hardware for encoding and decoding the unique codes assigned to each signal.
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Which of the following best describes Statistical Time Division Multiplexing (STDM)?
B · Allocates time slots dynamically based on data availability
STDM dynamically assigns time slots to channels based on whether they have data to transmit, improving efficiency over fixed TDM.
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Which of the following is an advantage of STDM over TDM?
B · More efficient bandwidth utilization by allocating slots on demand
STDM improves bandwidth efficiency by allocating time slots only to channels with data to send, unlike TDM's fixed allocation.
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Which of the following is a challenge when implementing STDM?
A · Requires complex address and control information to manage dynamic slot allocation
STDM requires additional control information to manage dynamic time slot allocation, increasing complexity.
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Which of the following is a disadvantage of Statistical Time Division Multiplexing (STDM)?
B · Increased complexity due to dynamic slot allocation and addressing
STDM's dynamic allocation requires complex control and addressing, increasing system complexity.
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Which of the following is NOT an advantage of multiplexing?
C · Increased data security by encrypting signals
Multiplexing improves channel utilization and reduces infrastructure costs but does not inherently provide data encryption or security.
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Which of the following is a disadvantage of multiplexing?
A · Increased complexity of multiplexing and demultiplexing equipment
Multiplexing requires additional equipment for combining and separating signals, increasing system complexity.
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Which of the following is an advantage of multiplexing in communication systems?
B · Efficient use of bandwidth by sharing a single channel among multiple signals
Multiplexing allows multiple signals to share a single channel, leading to efficient bandwidth utilization.
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Which of the following is a disadvantage of multiplexing?
A · Increased complexity and cost of equipment
Multiplexing requires complex equipment to combine and separate signals, increasing cost and complexity.
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Which of the following is a disadvantage specifically associated with Frequency Division Multiplexing (FDM)?
B · Susceptible to intermodulation distortion and crosstalk
FDM can suffer from intermodulation distortion and crosstalk due to overlapping frequency bands if not properly filtered.
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Which of the following is a typical application of multiplexing?
B · Combining multiple telephone calls over a single communication line
Multiplexing is commonly used to combine multiple telephone calls over a single physical line to optimize resource use.
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Which of the following applications typically uses Wavelength Division Multiplexing (WDM)?
B · Optical fiber communication
WDM is widely used in optical fiber communication to increase data capacity by using multiple wavelengths.
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Which of the following is an application of Statistical Time Division Multiplexing (STDM)?
A · Digital telephony systems to efficiently handle bursty data
STDM is used in digital telephony and data networks to efficiently allocate bandwidth based on demand, especially for bursty data.
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Which multiplexing technique is most suitable for combining multiple analog voice signals over a single channel?
A · Frequency Division Multiplexing (FDM)
FDM is traditionally used to combine multiple analog voice signals by allocating different frequency bands to each call.
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Refer to the table below comparing multiplexing techniques. Which technique provides the highest bandwidth efficiency for bursty data traffic?
C · Statistical Time Division Multiplexing (STDM)
STDM dynamically allocates bandwidth based on demand, making it efficient for bursty data traffic compared to fixed allocation in FDM and TDM.
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Which multiplexing technique requires the most complex synchronization between sender and receiver?
B · Time Division Multiplexing (TDM)
TDM requires precise synchronization to ensure correct timing of time slots between sender and receiver.
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Which multiplexing technique is best suited for optical fiber communication to maximize data throughput?
C · Wavelength Division Multiplexing (WDM)
WDM is widely used in optical fiber communication to increase throughput by transmitting multiple wavelengths simultaneously.
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Which multiplexing technique allows multiple users to transmit simultaneously over the same frequency band using unique codes?
C · Code Division Multiplexing (CDM)
CDM allows simultaneous transmission over the same frequency band by assigning unique codes to each user.
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Which of the following multiplexing techniques is LEAST efficient for bursty data traffic?
B · Time Division Multiplexing (TDM)
TDM allocates fixed time slots regardless of data presence, making it inefficient for bursty data traffic.
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Refer to the block diagram below of a multiplexing system. Which component is responsible for combining multiple input signals into one output signal?
B · Multiplexer
The multiplexer combines multiple input signals into a single output signal for transmission.
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What is the primary purpose of multiplexing in communication systems?
B · To combine multiple signals for transmission over a single medium
Multiplexing allows multiple signals to share a single communication channel, optimizing resource usage.
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Which of the following best defines multiplexing?
B · Combining multiple signals into one for transmission
Multiplexing combines multiple signals into one to efficiently use the transmission medium.
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How does multiplexing improve the efficiency of communication networks?
A · By reducing the number of required transmission channels
Multiplexing allows multiple signals to share a single channel, reducing the need for multiple physical channels.
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Which of the following is NOT a type of multiplexing?
C · Packet Switching Multiplexing (PSM)
Packet Switching Multiplexing is not a standard multiplexing technique; FDM, TDM, and WDM are common types.
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Which multiplexing technique assigns unique codes to each signal for simultaneous transmission over the same frequency band?
C · Code Division Multiplexing (CDM)
Code Division Multiplexing (CDM) uses unique codes to separate signals transmitted simultaneously over the same frequency.
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Which multiplexing technique is most suitable for optical fiber communication?
C · Wavelength Division Multiplexing (WDM)
Wavelength Division Multiplexing (WDM) is used in optical fibers to multiplex signals by different light wavelengths.
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Which of the following statements about Time Division Multiplexing (TDM) is TRUE?
C · TDM allocates distinct time slots to multiple signals sequentially
TDM works by dividing time into slots and assigning each signal a unique time slot for transmission.
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Which multiplexing technique uses orthogonal codes to separate multiple users in the same frequency band?
C · Code Division Multiplexing (CDM)
CDM uses orthogonal codes to allow multiple users to transmit simultaneously over the same frequency band.
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In Frequency Division Multiplexing (FDM), what is the main reason for including guard bands between frequency channels?
B · To prevent overlapping and interference between adjacent channels
Guard bands prevent frequency overlap and interference between adjacent channels in FDM.
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Which of the following is a typical application of Frequency Division Multiplexing (FDM)?
B · Cable television broadcasting
Cable TV uses FDM to transmit multiple channels simultaneously over a single coaxial cable.
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In Time Division Multiplexing (TDM), what happens if a device does not have data to transmit during its assigned time slot?
B · The time slot remains unused, causing inefficiency
In synchronous TDM, unused time slots remain idle, leading to inefficient bandwidth usage.
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Which of the following is an advantage of Time Division Multiplexing (TDM) over Frequency Division Multiplexing (FDM)?
D · No guard bands are required between channels
TDM does not require guard bands, unlike FDM, which needs them to avoid frequency overlap.
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Which of the following is a common application of Time Division Multiplexing (TDM)?
B · Digital telephony systems
Digital telephony commonly uses TDM to allocate time slots to multiple voice channels.
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Which characteristic distinguishes Wavelength Division Multiplexing (WDM) from Frequency Division Multiplexing (FDM)?
B · WDM uses different wavelengths of light instead of radio frequencies
WDM multiplexes signals by different light wavelengths in optical fibers, unlike FDM which uses radio frequencies.
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Which of the following is a disadvantage of Wavelength Division Multiplexing (WDM)?
B · High cost of optical components
WDM requires expensive optical components, making it costly compared to other multiplexing techniques.
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Which multiplexing technique allows multiple users to share the same frequency band simultaneously by using unique spreading codes?
C · Code Division Multiplexing (CDM)
CDM uses unique spreading codes to allow simultaneous use of the same frequency band by multiple users.
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Which of the following is an advantage of Code Division Multiplexing (CDM) over Frequency Division Multiplexing (FDM)?
B · Allows simultaneous transmission over the same frequency band
CDM allows multiple users to transmit simultaneously over the same frequency band using unique codes.
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Which of the following is a disadvantage of Code Division Multiplexing (CDM)?
B · Complexity in code generation and synchronization
CDM requires complex code generation and precise synchronization to maintain orthogonality and avoid interference.
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Which multiplexing technique generally requires guard bands to prevent interference between channels?
A · Frequency Division Multiplexing (FDM)
FDM requires guard bands between frequency channels to avoid overlap and interference.
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Which of the following is an advantage of Time Division Multiplexing (TDM) compared to Frequency Division Multiplexing (FDM)?
B · No guard bands required
TDM does not require guard bands, making it more bandwidth efficient than FDM.
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Which multiplexing technique is most vulnerable to the near-far problem, requiring power control to avoid interference?
C · Code Division Multiplexing (CDM)
CDM systems suffer from the near-far problem where stronger signals can overpower weaker ones, requiring power control.
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Which of the following best describes the relationship between multiplexing and demultiplexing?
A · Multiplexing combines signals; demultiplexing separates them at the receiver
Multiplexing combines multiple signals for transmission; demultiplexing separates them back at the receiver.
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Which of the following statements about demultiplexing is TRUE?
B · It separates combined signals into individual streams at the receiver
Demultiplexing occurs at the receiver to separate multiplexed signals into their original individual streams.
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Which of the following is NOT a typical application of multiplexing in networks?
B · Increasing the physical distance of fiber optic cables
Multiplexing does not increase physical distance; it combines multiple signals for efficient transmission.
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Which multiplexing technique is commonly used in cellular networks to allow multiple users to share the same frequency band?
C · Code Division Multiplexing (CDM)
Cellular networks often use CDM (CDMA) to allow multiple users to share the same frequency band simultaneously.
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At which OSI layer does multiplexing primarily occur when combining multiple data streams into a single physical channel?
A · Physical Layer
Multiplexing occurs mainly at the Physical Layer where multiple signals are combined for transmission over the physical medium.
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Which OSI layer is responsible for demultiplexing incoming signals to deliver data to appropriate upper-layer protocols?
D · Transport Layer
The Transport Layer demultiplexes data by using port numbers to deliver data to the correct application process.
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Which of the following best explains multiplexing's role in the OSI model's Physical Layer?
A · Combining multiple bit streams into one physical signal
At the Physical Layer, multiplexing combines multiple bit streams into a single physical signal for transmission.
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In a scenario where four users share a single communication channel using TDM, if each user is allocated 5 ms time slots in a 20 ms frame, what is the effective data rate for each user if the channel capacity is 1 Mbps?
B · 250 kbps
Each user gets 5 ms out of 20 ms (1/4th of the time), so effective data rate = 1 Mbps * 1/4 = 250 kbps.
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In a CDM system, if the spreading code length is increased, what is the expected effect on the system performance?
B · Decreased data rate and improved interference rejection
Longer spreading codes reduce data rate but improve interference rejection and signal separation in CDM.
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A fiber optic link uses WDM to multiplex 4 channels each operating at 10 Gbps. What is the total data rate transmitted over the fiber?
C · 40 Gbps
Total data rate = number of channels × data rate per channel = 4 × 10 Gbps = 40 Gbps.
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A multiplexing system uses WDM with 8 wavelengths, each wavelength using TDM to share among 5 users with equal time slots. The total channel capacity is 640 Mbps. What is the data rate available to each user?
A · 16 Mbps

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