When Pk2 timer finally expires, the following action(s) will take place pk2, pk3

Question

When Pk2 timer finally expires, the following action(s) will take place

pk2, pk3, pk4 and pk5 are resent

pk2 resent, sender window moves by 4 location

pk2 resent, sender window doesn't move

pk2 resent, sender window moves by one location

A)

pk2, pk3, pk4 and pk5 are resent

B)

pk2 resent, sender window moves by 4 location

C)

pk2 resent, sender window doesn't move

D)

pk2 resent, sender window moves by one location

Host A Host B pkt0 sent 01234567 pktl sent 1 2 3 4 5 6 789 pkt0 rcvd, delivered, ACKO sent :01 2 3 4567 pkt2 sent 01 23 456789 pkt1 revd, delivered, ACK1 sent :0123 456789 (loss) pkt3 sent, window full: 01234567 8 9 : Event A Event B : Event C Event F Event D pkt2 TIMEOUT : Event E

Explanation / Answer

Answer : c) pk2 resent and sender window doesn't move

This is because sender window has already moved two location before at event B and F, now the first frame itself is packet 2 in sender window, window moves only when acknowledgement is received for the packets in increasing order from start if window.

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