Data Link Layer

Data Link Layer

Data link layer is the second layer in OSI model.

As shown in image:


OSI model layers

As seen in the image above, the data link layer uses the services of the physical layer.

These services are used in lending and receiving the bits over the communication channel.

Functions of data link layer:

  1. Providing a well-defined service interface to the network layer
  2. Dealing with transmission errors.
  3. Regulating the flow of data so that slow receivers are not swamped by fast senders.

How data link layer accompanies its functions ?

From network layer data link layer takes packets. (you can see the image above)

These packets are encapsulated into frames for transmission.

A frame contains (see the image below),

  1. A frame header
  2. A payload field for holding the packet
  3. A frame trailer



Frame management is the heart of data link layers working.

How data link layer provides services to the network layer?

This is the function of data link layer to provide the srvices to the network layer.



Data link layer provide the service of data trnsfer from the network layer on the source machine to the network layer on the destination machine. See in the image above.

The job of the data link layer is to transmit the bits to the destination machine.

Data flow works takes place like, from Source machine network layer to source machine data link layer to source machine physical layer to destination machine physical layer to destination machine data link layer to destination machine network layer.

That means data transfer passes through network layer, data link layer and physical layer.




More topics from Computer Network to read.
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EasyExamNotes.com covered following topics in Computer Network.
  1. Data Link Layer
  2. Framing
  3. Byte count framing method
  4. Flag bytes with byte stuffing framing method
  5. Flag bits with bit stuffing framing method
  6. Physical layer coding violations framing method
  7. Error control in data link layer
  8. Stop and Wait scheme
  9. Sliding Window Protocol
  10. One bit sliding window protocol
  11. A protocol Using Go-Back-N
  12. Selective repeat protocol
  13. Application layer
References:
  1. Andrew S. Tanenbaum, David J. Wetherall, “Computer Networks” Pearson Education.
  2. Douglas E Comer, “Internetworking with TCP/IP Principles, Protocols, And Architecture", Pearson Education
  3. Kaveh Pahlavan, Prashant Krishnamurthy, “Networking Fundamentals”, Wiley Publication.
  4. Ying-Dar Lin, Ren-Hung Hwang, Fred Baker, “Computer Networks: An Open Source Approach”, McGraw Hill.
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EasyExamNotes.com covered following topics in these notes.

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    Computer Network ↓ 👆
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    EasyExamNotes.com covered following topics in these notes.
    1. Data Link Layer
    2. Framing
    3. Byte count framing method
    4. Flag bytes with byte stuffing framing method
    5. Flag bits with bit stuffing framing method
    6. Physical layer coding violations framing method
    7. Error control in data link layer
    8. Stop and Wait scheme
    9. Sliding Window Protocol
    10. One bit sliding window protocol
    11. A protocol Using Go-Back-N
    12. Selective repeat protocol
    13. Application layer
    References:
    1. Andrew S. Tanenbaum, David J. Wetherall, “Computer Networks” Pearson Education.
    2. Douglas E Comer, “Internetworking with TCP/IP Principles, Protocols, And Architecture",Pearson Education
    3. KavehPahlavan, Prashant Krishnamurthy, “Networking Fundamentals”, Wiley Publication.
    4. Ying-Dar Lin, Ren-Hung Hwang, Fred Baker, “Computer Networks: An Open Source Approach”, McGraw Hill.