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Suppose Host A and Host B use a GBN protocol with window size N = 3 and a long-enough range of sequence numbers. Assume

 

   

Suppose Host A and Host B use a GBN protocol with window size N = 3 and a long-enough range of sequence numbers. Assume Host A sends six application messages to Host B and that all messages are correctly received, except for the first acknowledgment and the fifth data segment. Draw a timing diagram (similar to the Figure below), showing the data segments and the acknowledgments sent along with the corresponding sequence and acknowledge numbers, respectively. Sender send pkto send pktl send pkt2 Receiver rev pkto send ACKO rev pkt1 send ACK1 send pkt3 (wait) (loss) rev pkt3, discard send ACK1 rev ACKO send pkt4 rev ACK1 send pkt5 pkt2 timeout send pkt2 send pkt3 send pkt4 send pkt5 rev pkt4, discard. send ACK1 rev pkt5, discard send ACK1 rev pkt2, deliver send ACK2 rev pkt3, deliver send ACK3 Go-back-N in operation

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