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After timeout occurs we should take the congestion window as 1MSS or the value given intialy before the slow start phase?

In standard book it is mentioned to start with 1MSS but on gateoverflow questions are solved taking the initial value as the congestion window size after timeout.

Example - https://gateoverflow.in/2156/gate2012_45 and https://gateoverflow.in/99884/tcp-slow-start

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After time out , cwnd must be initialised by 1MSS...Not the  previous value of cwnd.but to calculate ssthresh=(cwnd/2) previous cwnd value have to consider... Don't be confuse...

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