![]() ![]() Both uses piggybacked acknowledgements where possible and does not acknowledge every frame explicitly.The sender has a window defining maximum number of outstanding frames in both the protocols.Frame Formats are similar in both the protocols.The selective repeat protocol is similar to Go back N except in the following way. In SR Protocol, only the required frame is retransmitted and not the entire window.įrames through 0 to 4 have been transmitted. Now, imagine that 0 times out, 5 (a new frame) is transmitted, 1 times out, 2 times out and 6 (another new frame) is transmitted.Īt this point, what will be the outstanding packets in sender’s window? In SR protocol, suppose frames through 0 to 4 have been transmitted. Therefore, maximum window size possible of sender and receiver = 2 n-1
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