Data Link Layer Essentials Quiz
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Questions and Answers

What is the role of the data link layer?

  • Manage the network layer
  • Reliably move a message from one computer over one circuit to the next computer (correct)
  • Detect and correct transmission errors
  • Control the physical hardware of the network

    • Which sublayer of the data link layer is the connection to the network layer above it?

  • PDU message sublayer
  • Error control sublayer
  • Logical link control (LLC) sublayer (correct)
  • Media access control (MAC) sublayer

    • What does the media access control (MAC) sublayer control?

  • The physical hardware (correct)
  • Media access protocols
  • Message start and end identification
  • Transmission errors

    • What are the three functions of the data link protocol?

    <p>Controls when computers transmit, detects and corrects transmission errors, identifies the start and end of a message</p> Signup and view all the answers

    What does the logical link control (LLC) sublayer do?

    <p>Connects to the network layer above it</p> Signup and view all the answers

    What is the main responsibility of the data link layer?

    <p>Reliably move a message from one computer over one circuit to the next computer</p> Signup and view all the answers

    What is the role of the media access control (MAC) sublayer?

    <p>Control the physical hardware</p> Signup and view all the answers

    What are the three functions of the data link protocol?

    <p>Controls when computers transmit, detects and corrects transmission errors, identifies the start and end of a message</p> Signup and view all the answers

    What does the logical link control (LLC) sublayer do?

    <p>The data link layer's connection to the network layer above it</p> Signup and view all the answers

    What is one of the key responsibilities of the media access control (MAC) sublayer?

    <p>Both sender and receiver have to agree on protocols for communication</p> Signup and view all the answers

    Study Notes

    • Provides reliable data transfer between adjacent network nodes.
    • Functions as a bridge between the physical layer and the network layer.
    • Responsible for error detection and correction.
    • Provides flow control for reliable data exchange.

    • Logical Link Control (LLC):

      • Manages communication protocols between devices, using address information provided by the network layer.
      • Defines a mechanism for connecting to the network layer.
      • Handles higher-level functions, such as error control and flow control, across the network.

    • Media Access Control (MAC):

      • Focuses on physically accessing the shared network media.
      • Manages the physical addressing on the network.
      • Determines which device can transmit at a given time, preventing collisions.
      • Handles functions like address resolution, frame delimiting, and collision control.

    • Frame Delimiting :

      • Marks the start and end of each data packet.
      • Enables the receiver to identify the beginning and end of a frame.
      • Improves error detection and data integrity.

    • Error Detection :

      • Ensures data accuracy during transmission.
      • Utilizes error detection codes to identify errors introduced during. transmission.
      • Improves data integrity and reliability.

    • Flow Control :

      • Prevents the sender from overwhelming the receiver with data.
      • Regulates the transmission rate to ensure data is received and processed efficiently.
      • Prevents data loss and ensures smooth data transmission.

    MAC Sublayer Responsibilities

    • Collision Control :
      • Manages data traffic to avoid simultaneous transmissions on the same medium.
      • Ensures only one device transmits at a time, preventing data corruption.
      • Improves network efficiency and reliability.

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    Description

    Test your knowledge of the data link layer with this quiz covering its role, access control methods, error prevention techniques, and commonly used protocols.

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