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Cn

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station X needs to send a consisting of 12 packets to station Y using a sliding window(window size 4) and go back n error control stragedy.All packets are ready and immidiately available for transmission.If every 7th packet   that X transmits gets lost,then the no of packets that X will transmit for sending the message to Y are
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Sequence num. packet to be send
1 1
2 2
3 3
4 4
5 5
6 6
7(lost) 7 
8 8
9 9
10 10
11 7
12 8
13 9
14 10(lost)
15 11
16 12
17 10
18 11
19 12
   

So ans should be 19

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