Given that two hosts A and Buse a selective-repeat protocol with a sliding-windo

Question

Given that two hosts A and Buse a selective-repeat protocol with a sliding-window of size 4 packets and a 3-bit sequence number. Suppose that host A has transmitted 6 packets to host B and that the third packet was lost in transit. Answer the following questions about the diagram. At event A, the following actions will take place Host A Host B pkt0 sent 01 2 34 56 pktl sent 0123456789 pkt0 revd, delivered, ACKO sent 0 1 2 3 4 56 pktl revd, delivered, ACKi sent pkt2 sent 0 1 2 3 4 5 6789(s) : 012 3 4 56789 Loss) pkt3 sent, window full 0 1 2 3 4 5 6789 Event A Event B EventC EventF Event D pkt2 TIMEOUT Event E Pkt3 receved,buffered, ACK3 sent O PK3 received, discarded, ACK2 sent O PK3 received, discarded, ACK3 sent receiver window will move to begin at3

Explanation / Answer

Option 1: PK3 received buffered ACK3 sent:

Expalanation:

In SRP (selective repeat protocol) the sender keeps on sending the packets in its sequence and resends only the NACK(negative acknowledged) packed or timed out packets. Here PK3 will be received and ACK 3 will be sent.

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