At event F, the following actions will take place ACK1 received, pk4 sent, sende

Question

At event F, the following actions will take place

ACK1 received, pk4 sent, sender window moves to start at 1

ACK1 received, pk5 sent, sender window moves to start at 2

ACK1 received, pk6 sent , window moves to start at 3

ACK1 received, pk2 resent, window doesn't move

A)

ACK1 received, pk4 sent, sender window moves to start at 1

B)

ACK1 received, pk5 sent, sender window moves to start at 2

C)

ACK1 received, pk6 sent , window moves to start at 3

D)

ACK1 received, pk2 resent, window doesn't move

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: ACK1 received, pk4 sent, sender window moves to start at 1

Explanation: ACK1 will be received at EVENT F, Since 3 was send so 4 will be sent now.
Sender window will move to start at 1

THANKS, Let me know if there is any concern.

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