[Chapter 7 Quiz] Comp 20173 Data Communication And Networking

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  • 1/10 Questions

    To ensure that the content of the received frame at the destination matches that of the frame that left the source node, a transmitting node creates a logical summary of the contents of the frame. This is known as the CRC value. CRC means ________

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About This Quiz

This quiz for COMP 20173 Data Communication and Networking assesses knowledge on network protocols, MAC strategies, and data link layer functions. It evaluates understanding of CRC checks, frame contents, virtual circuits, and logical topologies, essential for networking professionals.

[Chapter 7 Quiz] Comp 20173 Data Communication And Networking - Quiz

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  • 2. 

    Which of the following describes a virtual circuit?

    • Is an error-detection technique

    • Provides an encapsulation technique

    • Is used only with point-to-point physical topologies

    • Establishes a logical connection between two network devices

    Correct Answer
    A. Establishes a logical connection between two network devices
    Explanation
    A virtual circuit is a communication path that is established between two network devices. It is a logical connection rather than a physical one. Unlike a physical circuit, a virtual circuit does not require a dedicated physical connection, but rather uses existing network infrastructure to create a logical connection. This allows for efficient use of resources and enables data to be transmitted between the devices in a reliable and efficient manner. Virtual circuits are commonly used in packet-switched networks, such as the internet, where data is divided into packets and routed through the network.

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  • 3. 

    Which of the following is a characteristic of contention-based MAC?

    • Used on nonshared media.

    • Nodes compete for the use of the medium.

    • Leaves MAC to the upper layer.

    • Each node has a specific time to use the medium.

    Correct Answer
    A. Nodes compete for the use of the medium.
    Explanation
    Contention-based MAC is a protocol used on nonshared media where nodes compete for the use of the medium. In this type of MAC, multiple nodes attempt to transmit data simultaneously and collisions may occur if two or more nodes transmit at the same time. The nodes then compete for retransmission by employing algorithms like CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) to avoid further collisions. This characteristic allows for efficient sharing of the medium among multiple nodes.

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  • 4. 

    What are the contents of the data field in a frame?

    • 64 bytes

    • The network layer PDU

    • The Layer 2 source address

    • The data directly from the application that generated the data

    Correct Answer
    A. The network layer PDU
    Explanation
    The correct answer is "The network layer PDU." In a frame, the data field contains the network layer Protocol Data Unit (PDU). The PDU includes the actual data that needs to be transmitted over the network. The data could be in the form of packets or segments, depending on the network layer protocol being used. The data field does not include the Layer 2 source address or the data directly from the application.

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  • 5. 

    If a node receives a frame and the calculated CRC does not match the CRC in the FCS, what action will the node take?

    • Drop the frame

    • Reconstruct the frame from the CRC

    • Forward the frame as it is to the next host

    • Disable the interface on which the frame arrives

    Correct Answer
    A. Drop the frame
    Explanation
    If a node receives a frame and the calculated CRC does not match the CRC in the FCS, the node will drop the frame. This is because the CRC (Cyclic Redundancy Check) is used to detect errors in the frame during transmission. If the calculated CRC does not match the CRC in the FCS (Frame Check Sequence), it indicates that there is an error in the frame. Therefore, the node will discard the frame to prevent the transmission of corrupted data.

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  • 6. 

    Which of the following functions does the data link layer perform?

    • Provides user interfaces

    • Ensures end-to-end delivery of data between hosts

    • Connects the network software to the network hardware

    • Establishes and maintains sessions between applications

    Correct Answer
    A. Connects the network software to the network hardware
    Explanation
    The data link layer is responsible for connecting the network software to the network hardware. This means that it provides the necessary interface for the network software to communicate with the physical network hardware, such as Ethernet cards or Wi-Fi adapters. It ensures that the data being sent by the network software is properly formatted and transmitted over the physical network, and also handles error detection and correction. By performing this function, the data link layer establishes a reliable connection between the network software and the network hardware, enabling the transmission of data between hosts.

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  • 7. 

    Which of the following protocols are typically used in WANs? (CHOOSE TWO)

    • 802.11

    • Ethernet

    • HDLC

    • PPP

    Correct Answer(s)
    A. HDLC
    A. PPP
    Explanation
    HDLC (High-Level Data Link Control) and PPP (Point-to-Point Protocol) are typically used in WANs. HDLC is a synchronous data link layer protocol that provides error detection and flow control. It is commonly used in leased line connections. PPP is a data link layer protocol that provides a secure and reliable connection between two nodes. It is commonly used in dial-up connections and is also widely used in WAN connections. Ethernet and 802.11 are LAN protocols and are not typically used in WANs.

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  • 8. 

    Which of the following protocols are typically used in LANs? (CHOOSE TWO)

    • 802.11

    • Ethernet

    • HDLC

    • PPP

    Correct Answer(s)
    A. 802.11
    A. Ethernet
    Explanation
    802.11 and Ethernet are typically used in LANs. 802.11 is a wireless protocol commonly known as Wi-Fi, which allows devices to connect to a network without the need for physical cables. Ethernet, on the other hand, is a wired protocol that uses cables to connect devices in a LAN. Both protocols are widely used in local area networks to enable communication between devices within a limited geographic area.

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  • 9. 

    Which of the following is true about the logical topology of a network?

    • Is always multiaccess

    • Provides the physical addressing

    • Is determined by how the nodes in the network are connected

    • Influences the type of MAC used in the network

    Correct Answer
    A. Influences the type of MAC used in the network
    Explanation
    The logical topology of a network refers to how the nodes in the network are connected. It determines the flow of data and the communication paths between devices. The type of logical topology chosen for a network can influence the type of Media Access Control (MAC) used. MAC protocols determine how devices on a network gain access to the communication medium and avoid collisions. Different logical topologies may require different MAC protocols to ensure efficient and reliable communication. Therefore, the statement "Influences the type of MAC used in the network" is true about the logical topology of a network.

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  • 10. 

    Which of the following are common data link sublayers used in LANs? (Choose two.)

    • Protocol data unit

    • Logic Link Control

    • Media Access Control

    • Network interface card

    • Carrier Access MultiAccess

    Correct Answer(s)
    A. Protocol data unit
    A. Logic Link Control
    A. Media Access Control
    Explanation
    The correct answer is Protocol data unit, Logic Link Control, and Media Access Control. These three options are common data link sublayers used in LANs. The Protocol Data Unit (PDU) is the information that is being transmitted between two devices in a network. Logic Link Control (LLC) is responsible for error control and flow control in the data link layer. Media Access Control (MAC) is responsible for controlling access to the network media and ensuring that data is transmitted correctly. Network interface card and Carrier Access MultiAccess are not data link sublayers but rather hardware components used in LANs.

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  • Current Version
  • Jul 11, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 19, 2019
    Quiz Created by
    Homer Santos
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