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In the GO back N ARQ sender is sending the 20 packets to the destination with a window size of 4. Every sixth packet is lost and after a packet loss sender is sending one dummy packet outside the window for ensuring everything is correct [ dummy packet is an outside packet not the part of the window]. How many number of transmissions will be there?

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Total number of transmission = 54

1 2 3 4 5 6 7 8 9 6 7 8 9 10 11 8 9 10 11 12 13 10 11 12 13 14 15 12 13 14 15 16 17 14 15 16 17 18 19 16 17 18 19 20 18 19 20

(Bold numbers represent one window)

= 47

Also we need to send 7 dummy packet for 7 windows.

Therefore total = 47 + 7

54 transmissions.

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