Computer Networks Lecture 10: Data Link Layer
14 Questions
5 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main responsibility of the Data Link layer?

  • Encapsulating frames into packets
  • Assembling data into recognizable frame format
  • Transferring datagram from one node to the physically adjacent node over a link (correct)
  • Sending electrical signals over the network

    • How does the Data Link layer transfer data from one node to the adjacent node?

  • By encrypting the data and sending it over the network
  • By compressing the data and transmitting it wirelessly
  • By converting data into packets and sending them through routers
  • By converting data stream to signals bit by bit and sending them over the hardware (correct)

    • Which hardware can implement the Data Link layer?

  • USB printer
  • Ethernet card and 802.11 card (correct)
  • Bluetooth speaker
  • HDMI cable

    • What is the function of the Data Link layer in terms of framing?

    <p>Encapsulating packets into frames</p> Signup and view all the answers

    Which layer takes packets from the network layer and encapsulates them into frames?

    <p>Data-link layer</p> Signup and view all the answers

    What are the datagrams transferred by different link protocols over different links?

    <p>Ethernet on one link, 802.11 on another link</p> Signup and view all the answers

    What is the responsibility of the Logical Link Control (LLC) sublayer in the data link layer?

    <p>Dealing with framing, flow of data, and error detection/correction</p> Signup and view all the answers

    What is the main responsibility of the Media Access Control (MAC) sublayer in the data link layer?

    <p>Controlling physical media access</p> Signup and view all the answers

    What type of error involves two or more bits in the data unit changing from 0 to 1 or vice-versa, regardless of whether they occur in consecutive bits?

    <p>Burst Error</p> Signup and view all the answers

    Which error detection mechanism organizes the block of bits in the form of a table and calculates parity check bits for each row and column?

    <p>Two-dimensions Parity Check</p> Signup and view all the answers

    What is the purpose of using Cyclic Redundancy Check (CRC) for error detection?

    <p>Detecting errors by generating a checksum</p> Signup and view all the answers

    What is the basic concept behind simple parity checking or one-dimension parity check for error detection?

    <p>Appending a redundant bit to ensure an even number of 1s in the data unit</p> Signup and view all the answers

    What problem does error control in the data link layer aim to address?

    <p>Correcting bit errors without retransmission</p> Signup and view all the answers

    In the context of the data link layer, what does flow control ensure?

    <p>Exchange of data at different speeds between machines</p> Signup and view all the answers

    Study Notes

    • The main responsibility of the Data Link layer is to transfer data from one node to an adjacent node.

    Data Transfer Process

    • The Data Link layer transfers data by encapsulating packets from the Network layer into frames.
    • Frames are then transmitted over a single link to the adjacent node.

    Hardware Implementation

    • The Data Link layer can be implemented using network interface cards (NICs) and Ethernet switches.

    Framing Function

    • The Data Link layer is responsible for framing, which involves breaking data into frames and adding headers and trailers.

    Sublayers

    • The Logical Link Control (LLC) sublayer is responsible for managing and controlling the flow of data between devices.
    • The Media Access Control (MAC) sublayer is responsible for controlling access to the shared network medium.

    Error Detection

    • A multi-bit error involves two or more bits in the data unit changing from 0 to 1 or vice-versa, regardless of whether they occur in consecutive bits.
    • Two-dimensional parity checking calculates parity check bits for each row and column to detect errors.
    • Cyclic Redundancy Check (CRC) is used for error detection to ensure that the received data is accurate and error-free.
    • Simple parity checking, or one-dimension parity check, adds a single bit to the data to detect errors.

    Error Control and Flow Control

    • Error control in the Data Link layer aims to address errors in data transmission.
    • Flow control ensures that the sender does not send more data than the receiver can handle, preventing data loss.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz covers the content from Lecture 10 of Computer Networks by Dr. Dina Fawzy, focusing on the introduction to the Data Link layer, its functions, protocols, error detection and correction, and the terminology related to hosts, routers, and communication channels.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser