Error Control in Data link layer

Error Control in Data link layer:

In previous article Framing we had seen than, sender transmits packets in the form of frame to the receiver. But there is a travel of frame between sender to the receiver.  So there is chances of error to occur in this travel. 


Now in this article we will see how error is control in data link layer.

With positive and negative acknowledgement about a frame.
  1. If the sender receives a positive acknowledgement about a frame, the frame has received safely. 
  2. A negative acknowledgement means that something has gone wrong and the frame must be transmitted again.
What if frame not received by receiver?
  1. Here timer concept is used.
  2. When the sender transmits a frame, it also starts a timer. 
  3. Before expiry of this timer acknowledgement from receiver must reach to the sender.
  4. In absent of acknowledgement sender will again transmit the frame.
What is acknowledgement sent by receiver not reached to sender?
  1. In this case may possible sender sent multiple frames.
  2. To prevent from receiving same frames by receiver sender assign a sequence number to the frame. 
  3. By seeing sequence number receiver identifies that its duplicate frame.




More topics from Computer Network to read.
Computer Network
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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Previous years solved papers:
A list of Video lectures References:
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  2. Louden, “Programming Languages: Principles & Practices” , Cengage Learning 
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    Computer Network ↓ 👆
    Computer Network

    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.