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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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after threshold window size increses linearly. i.e. +1mss
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Answer given in made easy, they have taken 1MSS. So i am confused.

I think answer is also wrong as they have taken 4th transimission two  times

+1

https://gateoverflow.in/39167/size-of-senders-window

In Case of AIMD , Remember following points to solve the questions : -

1 - Start with Given MSS (Min Seq Size)
2 - Increase the Window size in multiples of MSS till the threshold occurs
3 - Once the threshold reached , increase the window size by 1 MSS till the timeout occurs
4 - Once the timeout occurs , reduce threshold to half and again start from Given Start MSS.

+1

@JAYKISHAN

I think answer is also wrong as they have taken 4th transimission two  times

The 0th transmission is 2MSS.

1st transmission is 4MSS.

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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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