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Suppose TCP’s additive increase and multiplicative decrease algorithm is used as a congestion control algorithm. The slow start phase begins with 4 MSS and threshold at start of first transmission is 16 MSS. Assume that a time-out occurs during 6 th transmission, what will be the congestion window at 10 th transmission.

source: https://gateoverflow.in/2156/gate2012_45

I'm not satisfied with the answer here. Shouldn't it start with 1 MSS again? 

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4mss-8mss-16mss-17mss-18mss-19mss threshold occur 19/2=9 again ,,4mss-8mss-9mss-10mss
So total 10

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