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Consider the effect of using slow start on a line with 12 msec round trip time. The size of the congestion window is set to 40 KB. The sender side threshold is set to 20 KB. After 7th transmission a time-out occurs, after timeout the time taken to send the first full window of 20 KB is (in msec). ? [ Assume window size at the start of the slow start phase is 2 KB, MSS=2KB]

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First transmission: 2KB


Second Transmission:  4KB


Third transmission: 8KB


Fourth transmission: 16 KB


Fifth transmission: 20 KB [ Threshold reached]


Sixth transmission: 22 KB


Seventh transmission: 24 KB [ Timeout occurs, new th = 24 / 2 = 12 KB]


Eighth transmission: 2 KB


Ninth transmission: 4 KB


Tenth transmission: 8 KB


Eleventh Transmission: 12 KB [ Th reached]


Twelfth transmission: 14 KB


Thirteenth transmission: 16


Fourteenth transmission: 18 KB


Fifteen transmission: 20 KB


So 8RTT after timeout.


=> 8 x 12 = 96  msec 

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