Chapter 10 Data Link Control by 49aS9M

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									Data Link Control

   • Line Discipline
    • Flow Control
    • Error Control
Functions of
Data Link Layer
Point-to-point Discipline


       ENQ/ACK
ENQ/ACK
Multipoint Discipline
Select
Poll
Flow control – set of procedures that tells the sender
how much data it can transmit before it must wait for
an acknowledgement from the receiver
Stop and Wait
Sliding Window
Sender Sliding Window
Receiver Sliding Window
Sliding Window Example
Error Control
Damaged Frame –Stop & Wait
         Lost Frame –Stop & Wait

                                                  Receiver
Sender

   The data frame will be retransmitted when it is lost


          Lost ACK–Stop & Wait

Sender                                            Receiver



The data frame will be retransmitted when the ACK is lost
Damaged Frame –
Sliding Window (Go back-n)
Lost Data Frame –
Sliding Window (Go back-n)
LOST ACK Frame –
Sliding Window (Go back-n)
Damaged Frame –
Sliding Window (Selective Reject)

								
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