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After receiving 3 duplicate ACKs sender will go to slow start phase or congestion avoidance?

Somewhere, I read that, 3 duplicacy means the weak-possibility of congestion. When does global timer expire?

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When Global timer expires, it's Strong possibility of congestion. Rest you can check in diagram. 

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Na462 asked Dec 2, 2018
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Assume the scenario where size of the congestion window of a TCP connection be 40KB when timeout occurs. The MSS is 2KB. Propagation delay be 200msec. Time taken by TCP c...