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I am getting answer as 9, someone please post their solution stepwise, that would be of great help to identify the mistake.

edited | 148 views
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Initial Threshold=12

2  4  8  12  13  14  15    Now timeout. New threshold = 7, start again with 2MSS from the 8th transmission

2  4  7  8  9  10               So as we can see at the end of 12th transmission congestion window size is 10.
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After the timeout new window size will be set to 1MSS and not to 2MSS..

reference: https://gateoverflow.in/2156/gate2012-45

I assume the solution is given as 10MSS because either the new threshold is set to 8MSS instead of 7 or the given solution is wrong.

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yes, I also took 1MSS after Timeout
so whats the final answer then?
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"The question asks the window size at the end of 10th transmission. The window size increases by 1 after the acknowledgment are received, not at the end of the transmission. "

Observe this statement in the above link.

you got 9 add 1 to it. This will make answer as 10.

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initially 2 4 8 12 13 14  15  time out new threshold = floor[15/2] = 7

1 2 4 7 8 , so congestion window after 12th transmission  = 8+1 = 9
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I think it take ceil (15/2) = ceil (7.5) = 8

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@Magma why we take ceil(7.5) can you please elaborate this.