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 _______

Question: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 _______

1.Packet which are not lost

2. Only those packets which are lost or corrupted

3.Packet from starting

4.All the packets


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