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If the bandwidth of a medium is 100 Mbps and round-trip time is 50 microseconds then calculate the sequence bits in Go Back N ARQ flow control policy is applied and frame size 100 bits has to be transfer.

A )     5

B)      6

C)      7

D)      None of these
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Round trip time = 2* Tp (propagation delay) = 50 * 10-6 sec

Transmission time ( Tt)= frame size(L) /Bandwidth (B) = 100 / (100 * 106 ) sec = 10-6 sec

Total window size = 1+ 2* (Tp / Tt )

                              =  1+ (50 * 10-6 / 10-6)

                               = 51

No of bits for sequence number = ceil of (log2 51) = 6

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