Need these answered in 20 mins. please help!! do not answer if not by 6:15 pacif

Question

Need these answered in 20 mins. please help!! do not answer if not by 6:15 pacific time on Sept 16, 2017. THANKS!!!

Given that two hosts A and B use 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

1)

a) Pkt3 received, buffered, ACK3 sent

b) PK3 received, discarded, ACK2 sent

c) PK3 received, discarded, ACK3 sent

d) receiver window will move to begin at 3

2) At Event B, the following actions will take place

a) ACK0 received, pk4 sent, sender window doesn't move

b) ACK0 received, pk4 sent, sender window moves to start at 1

c) ACK0 received, pk2 resent

d) ACK0 received, pk1, pk2 and pk3 resent

3) At event F, the following actions will take place

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

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

pk2 resent, sender window moves by one location

a) ACK0 received, pk4 sent, sender window doesn't move

b) ACK0 received, pk4 sent, sender window moves to start at 1

c) ACK0 received, pk2 resent

d) ACK0 received, pk1, pk2 and pk3 resent

3) At event F, the following actions will take place

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

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

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 0 1 2 3 4 5 6 7 8 9 pkt0 rcvd, delivered, ACKO sent :01 2 3 456 7 pkt1 revd, delivered, ACKi sent 0 1 2 3 4 5 6789 _pkt2 sent 0 1 2 3 4 5 67 8 9 (loss) pkt3 sent, window full 01 234567 89 : Event A Event B :Event C Event F Event D _pkt2 TIMEOUT, : Event E

Explanation / Answer

At event A : [B] PK3 received, discarded, ACK2 sent
At event B : [C] ACK0 received, pk2 resent
At event F : [A] ACK1 received, pk4 sent, sender window moves to start at 1
[4] [D] pk2 resent, sender window moves by one location

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