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Consider an instance of  TCP additive increase multiplicative decrease (AIMD) algorithm where the window size at the start of  the slow start phase is 2 MSS and the threshold at the start of the first transmission is  12 MSS. Assume that a time out occurs during the 7th transmission. The congestion window size at the end of 12th transmission is ______. (in MSS)

My question is, After reached to threshold, should we have to increase congestion window with 1MSS or with 2MSS.
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Is it  compulsory to give 0th number to first transmission.
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we have to count number of transmissions. . so by default we start with 1. like 1st transmission then 2nd then 3rd and so on.
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answer will be 9 mss like  2 4 8 12 13 14 15 1 2 4 7 8 9 10

after 12 the transmission window size will be 9 mss

chek this link below

https://www.geeksforgeeks.org/gate-gate-cs-2012-question-45/

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