GATE 2012 CS (CS1) – Question 55

Computer Networks · TCP: Flow Control, Congestion Control, Socket API · 2 marks · MTA

TCP AIMD starts slow start with window 2 MSS and initial threshold 8 MSS. A timeout occurs during transmission five. Find congestion window at the end of transmission ten.

8 MSS
14 MSS
7 MSS
12 MSS

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Correct answer: MTA

Explanation

The final key awards marks to all. Before timeout the nominal round windows are 2,4,8,9,10 MSS. A timeout conventionally resets the congestion window to one MSS and halves the flight-size threshold; subsequent slow start and additive increase depend on the exact round/ACK timing and threshold convention. The printed transmission-level wording does not uniquely settle those details. Preserve universal credit rather than impose one of the offered windows.

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