In Go-Back-N window, when the timer of the packet times out, several packets have to be resent even some may have arrived safe. Whereas in Selective Repeat window, the sender resends ___________(a) Packet which are not lost(b) Only those packets which are lost or corrupted(c) Packet from starting(d) All the packetsThis question was posed to me in a national level competition.I need to ask this question from Congestion Control topic in portion Frame Relay of Computer Network

In Go-Back-N window, when the timer of the packet times out, several p

1.	In Go-Back-N window, when the timer of the packet times out, several packets have to be resent even some may have arrived safe. Whereas in Selective Repeat window, the sender resends ___________(a) Packet which are not lost(b) Only those packets which are lost or corrupted(c) Packet from starting(d) All the packetsThis question was posed to me in a national level competition.I need to ask this question from Congestion Control topic in portion Frame Relay of Computer Network
Answer» Right option is (b) Only those packets which are lost or corrupted Explanation: In Selective REPEAT, the sender SIDE uses a searching algorithm to find the packets which NEED to be retransmitted based on the negative ACKNOWLEDGEMENTS received and then resends only those packets thus saving bandwidth.

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