Lecture 20

Error Control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Automatic repeat request (ARQ) – turn an unreliable data link into a reliable one Anytime an error is detected in an exchange, a negative ack (NAK) is returned and the specified frames are retransmitted. Retransmission of data in three cases: damaged frame, lost frame, and lost ack.

Stop and Wait ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Damaged frame ,[object Object],[object Object]

Lost data frame ,[object Object],[object Object],[object Object],[object Object]

Lost acknowledgment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Stop and Wait - Pros and Cons ,[object Object],[object Object]

Sliding window ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sliding window ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object]

Go Back n ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object]

Lost Data Frame ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lost Acknowledgement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lost Acknowledgement ,[object Object],[object Object],[object Object],[object Object]

Selective Reject ARQ ,[object Object],[object Object],[object Object],[object Object],[object Object]

Selective Reject- Damaged frame

Lost frames ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lost Acknowledgement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

In Sliding Window Flow Control/ ARQ, The window size need not be the maximum possible size for a given sequence number length. The size of the window is n-1. Why? Question

Problem 1 ,[object Object],[object Object],[object Object],[object Object]

Problem 2 ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Lecture 20