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Consider an instance of TCP’s Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 MSS and the threshold at the start is 1st transmission is 16 MSS. Assume TCP use over a lossy link i.e., timeout occur after transmission of 7th packet . The congestion window size at the end of 14 RTT is _________ (in MSS).

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at t1 2MSS

at t2 4 MSS

at t3 8 MSS

at t4 16MSS (reach at threshold)

at t5 17MSS

at t6 18 MSS

at t7 19 MSS (time out occurs so threshold will be n/2 i.e. 19/2 )

it will start again with 1MSS

t8 1 MSS

t9 2 MSS

t10 4 MSS

t11 8 MSS

t12 9 MSS

t13 10 MSS

t14 11 MSS

so, at the end of 14 MSS will be 12MSS

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