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Computer Networks Lecture 10: Data Link Layer Functions and Protocols
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Computer Networks Lecture 10: Data Link Layer Functions and Protocols

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Questions and Answers

What is the main responsibility of the Data Link layer?

  • Handling routing between different networks
  • Transferring datagram from one node to the physically adjacent node over a link (correct)
  • Transferring datagram from one node to any node in the network
  • Encapsulating data into packets

    • Which hardware implements the Data Link layer?

  • Ethernet card and 802.11 card (correct)
  • USB flash drive
  • External hard drive
  • Bluetooth adapter

    • What does the Data Link layer do with the packets received from the network layer?

  • Encapsulates them into frames (correct)
  • Transmits them wirelessly
  • Converts them into electrical signals
  • Routes them to the correct destination

    • What kind of links can the Data Link layer work with?

    <p>Wired links and wireless links</p> Signup and view all the answers

    What type of protocols can be used for transferring datagrams over different links?

    <p>Different link protocols like Ethernet and 802.11</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 Logical Link Control (LLC) sublayer?

    <p>Handling framing and error detection</p> Signup and view all the answers

    Which mechanism for error detection appends a redundant bit to every data unit?

    <p>Simple Parity Checking</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?

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

    What is the role of the Media Access Control (MAC) sublayer?

    <p>Managing hardware addressing</p> Signup and view all the answers

    Which protocol is commonly used for wired links at the data link layer?

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

    What does the Data Link layer do to ensure flow control?

    <p>Enables machines to exchange data at the same speed</p> Signup and view all the answers

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

    <p>Detecting and correcting bit errors</p> Signup and view all the answers

    In which error detection mechanism are parity check bits calculated for each row and column?

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

    What does the term 'burst error' mean in the context of data transmission?

    <p>Two or more bits in the data unit have changed from 0 to 1 or vice-versa.</p> Signup and view all the answers

    What is the main function of the Simple Parity Checking mechanism?

    <p>Ensures that the number of 1s in the unit becomes even for error detection.</p> Signup and view all the answers

    What is the primary responsibility of the Data Link layer?

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

    What hardware implements the Data Link layer?

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

    In what format does the Data Link layer assemble the electrical signals received from the hardware?

    <p>Frame format</p> Signup and view all the answers

    Which protocol is commonly used for wireless links at the Data Link layer?

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

    What does the Logical Link Control (LLC) sublayer handle at the Data Link layer?

    <p>Addressing and multiplexing</p> Signup and view all the answers

    Which error detection mechanism involves appending a redundant bit to every data unit?

    <p>Parity checking</p> Signup and view all the answers

    What is the primary responsibility of the Logical Link Control (LLC) sublayer?

    <p>Managing framing and flow of data</p> Signup and view all the answers

    What is the main purpose of the Media Access Control (MAC) sublayer?

    <p>Managing physical media access and hardware addressing</p> Signup and view all the answers

    What type of errors does the term 'burst error' refer to in the context of data transmission?

    <p>Errors involving two or more bits changing in a data unit</p> Signup and view all the answers

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

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

    What type of error detection mechanism appends a redundant bit called parity bit to every data unit to ensure the number of 1s is even?

    <p>Simple Parity Checking</p> Signup and view all the answers

    What does the Data Link Layer do to ensure flow control for data exchange?

    <p>It enables both machines to exchange data at the same speed</p> Signup and view all the answers

    Which protocol is commonly used for wireless links at the Data Link layer?

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

    What are the two sub-layers of the Data Link layer?

    <p><strong>Logical Link Control (LLC)</strong> and Media Access Control (MAC)</p> Signup and view all the answers

    What does the term 'single-bit error' mean in the context of data transmission?

    <p><strong>Only one bit</strong> of a given data unit is changed from 1 to 0 or from 0 to 1</p> Signup and view all the answers

    Why does the Data Link layer provide a hardware addressing mechanism?

    <p><strong>To uniquely identify devices on the link</strong></p> Signup and view all the answers

    Study Notes

    • The Data Link layer is responsible for providing error-free transfer of data frames between two devices on the same network.
    • It ensures flow control to avoid overflow of data at the receiver's end.

    Hardware Implementation

    • The Data Link layer is implemented on network interface cards (NICs) and other network devices.

    Packet Handling

    • The Data Link layer receives packets from the network layer and breaks them down into frames for transmission.
    • It also receives frames from the physical layer and reassembles them into packets for the network layer.
    • The Data Link layer can work with both point-to-point and point-to-multipoint links.

    Protocols

    • Protocols such as PPP and Ethernet are used for transferring datagrams over different links.

    Frame Transfer

    • The Data Link layer transfers frames onto the hardware using framing and arbitration mechanisms.

    LLC Sublayer

    • The Logical Link Control (LLC) sublayer is responsible for multiplexing, flow control, and error detection.

    Error Detection Mechanisms

    • The parity check mechanism appends a redundant bit to every data unit for error detection.
    • The Cyclic Redundancy Check (CRC) mechanism is used for error detection and correction.
    • The term 'burst error' refers to multiple-bit errors in a single data unit.

    MAC Sublayer

    • The Media Access Control (MAC) sublayer is responsible for resolving collisions and allocating bandwidth.

    Common Protocols

    • Ethernet is commonly used for wired links at the Data Link layer.
    • Wi-Fi is commonly used for wireless links at the Data Link layer.

    Sublayers

    • The two sub-layers of the Data Link layer are the Logical Link Control (LLC) sublayer and the Media Access Control (MAC) sublayer.

    Addressing

    • The Data Link layer provides a hardware addressing mechanism to physically address devices on a network.

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    Quiz Team

    Description

    This quiz covers the introduction to the Data Link layer, its functions, protocols, types of errors, error detection and correction, as well as the terminology related to hosts, routers, and communication channels. Test your understanding of transferring datagrams between nodes over communication links.

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