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Consider a TCP connection using the multiplicative additive congestion control algorithm where the window size is 1 MSS and the threshold is 32 MSS. At the $8^{th}$ transmission timeout occurs and enters in the congestion detection phase. The value of the window size (in MSS) at the end of $12^{th}$ transmission is ______.

Ans given 8 but I got 16.

Though there are numerous questions of this sort being posted here on GO. But since my answer didn’t match with them, I wanted to clarify.

It says at the end of $12^{th}$ transmission. So we have to take the window size after the 12 RTTs right and not at 12th RTT?

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4 Comments

supporting to aambazinga,

there may be chance of TO or 3 duplicates, then sender window changes

∴ we have to return the window size at 12th transmission if it ask what is the window size at end of 12 th transmission.
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Ok..got it..thanks! :) @MiNiPanda @Shaik Masthan

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there may be chance of TO or 3 duplicates, then sender window changes

or may be not.

so both answers should be correct.(8 and 16).

gate question will either mention it clearly or they will provide a range in the answer.
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