Computer Networks Lecture 10: Data Link Layer
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Questions and Answers

What mechanism for error detection involves appending a redundant bit to every data unit to make the total number of 1s in the unit even?

  • Logical Link Control (LLC)
  • Two-dimensions Parity Check
  • Cyclic Redundancy Check (CRC)
  • Simple Parity Checking (correct)

    • Which sublayer of the data link layer is responsible for hardware addressing mechanism and controlling physical media access?

  • 802.11 for wireless links
  • Logical Link Control (LLC)
  • Point-to-Point Protocol (PPP)
  • Media Access Control (MAC) (correct)

    • What is the term used to describe an error where two or more bits in the data unit have changed from 0 to 1 or vice-versa, without necessarily occurring in consecutive bits?

  • Burst Error (correct)
  • Error Correction
  • Flow Control
  • Single-bit Error

    • Which data link layer protocol is commonly used for wireless links?

    <p>802.11</p> Signup and view all the answers

    Which error detection mechanism organizes the block of bits in a table and calculates parity check bits for each row and column to not only detect but also correct errors?

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

    What is the responsibility of the data link layer?

    <p>Transferring datagram from one node to physically adjacent node over a link</p> Signup and view all the answers

    What does the data link layer do with packets from the network layer?

    <p>Encapsulates them into frames</p> Signup and view all the answers

    Which hardware example illustrates the implementation of the data link layer?

    <p>Ethernet card and 802.11 card</p> Signup and view all the answers

    What is the primary function of the data link layer?

    <p>Framing</p> Signup and view all the answers

    How does the data link layer transfer frames on the hardware?

    <p>Bit-by-bit</p> Signup and view all the answers

    What is the responsibility of the data link layer in a computer network?

    <p>Transferring datagram from one node to the physically adjacent node over a link by converting data stream to signals bit by bit and sending them over the underlying hardware.</p> Signup and view all the answers

    How does the data link layer handle datagrams at the adjacent node?

    <p>The data link layer picks up data from the hardware, assembles them into a recognizable frame format, and hands them over to the upper layer.</p> Signup and view all the answers

    What is the function of framing in the data-link layer?

    <p>Encapsulating packets from the network layer into frames and sending each frame bit-by-bit on the hardware.</p> Signup and view all the answers

    Give an example of the implementation of the data link layer in hardware.

    <p>Ethernet card and 802.11 card</p> Signup and view all the answers

    What is the primary purpose of data link layer protocols in a computer network?

    <p>To transfer datagrams by different link protocols over different links, such as Ethernet on one link and 802.11 on another link.</p> Signup and view all the answers

    What are the two sub-layers of the data link layer, and what are their respective functions?

    <p>Logical Link Control (LLC) and Media Access Control (MAC). LLC deals with framing, flow control, error detection, and correction. MAC is responsible for hardware addressing and controls physical media access.</p> Signup and view all the answers

    Explain the difference between single-bit error and burst error in data transmission.

    <p>Single-bit error means that only one bit of a data unit is changed, while burst error means that two or more bits in the data unit have changed, not necessarily in consecutive bits.</p> Signup and view all the answers

    What is the primary purpose of the Cyclic Redundancy Check (CRC) mechanism in error detection?

    <p>The primary purpose of CRC is to detect errors in transmitted data.</p> Signup and view all the answers

    How does the simple parity check mechanism improve error detection?

    <p>The simple parity check appends a redundant bit to every data unit to ensure that the total number of 1s in the unit, including the parity bit, is even.</p> Signup and view all the answers

    What types of errors are addressed by the Error Control function of the data link layer, and how are these errors handled?

    <p>Error Control handles errors caused by signal attenuation, noise, and bit flips. These errors are detected and attempted to be recovered through error detection and correction mechanisms.</p> Signup and view all the answers

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