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. 63

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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Given slow start phase start at cwnd = 2MSS

Threshold = 16MSS

Now it given that TO occcurs after 7th transmission

2 | 4 | 8 | 16 | 17 | 18 | 19 (Timeout New TH = 19/2 = 7.5 ==> 8) | 1 | 2 | 4 | 8 (Threshold reached CA now) | 9 | 10 | 11 | 12

| ==> RTT

after 14 RTT ==> 12MSS

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