Content: Go-Back-N Vs Selective Repeat. SR protocol may be considered as a combination of advantages of Stop and Wait ARQ and Go back N. SR protocol is superior to other protocols but because of its complexity, it is less used. If the ACK is not received, it re-transmits the previous packet again. Go-Back-N Protocol And Selective Repeat Protocol Go-Back-N protocol also referred to as Go-Back-N Automatic Repeat reQuest, is a data link layer protocol that uses a sliding window method for reliable and sequential delivery of data frames. Go Back N –
GO-BACK- N SLIDING WINDOW PROTOCOL: Go-back-N is also one of the sliding window protocols.
The retransmitted frame in the selective repeat protocol is always received out of sequence. Comparison Chart; Definition There major flow control protocols – Stop and Wait, Go Back N, and Selective Repeat. It is a case of sliding window protocol having to send window size of N and receiving window size of 1. The “selective repeat protocol” retransmits only that frame which is damaged or lost.
The Selective repeat protocol basically only retransmits the damaged or lost frame. This protocol mechanism is essentially used to control and detect the errors occurring in the data link layer. Go back N and Selective Repeat are similar in terms of efficiency if sender window sizes are same. Stop and Wait – The sender sends the packet and waits for the ACK (acknowledgement) of the packet.
Once the ACK reaches the sender, it transmits the next packet in row. The basic difference between go-back-n protocol and selective repeat protocol is that the “go-back-n protocol” retransmits all the frames that lie after the frame which is damaged or lost.
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