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TCP slow start and duplicate ack

au flag

In TCP slow start, what happens when 3 duplicate ack is received. I am aware of the recovery process in congestion avoidance, however I read a blog post that if 3 duplicate acks are received in slow start, TCP perform fast recovery. I was under the impression that whether it is RTP or 3 dup ack, in slow start, TCP fall back to initial cwnd value.

"The final way in which slow start can end is if three duplicate ACKs are detected, in which case TCP performs a fast retransmit and enters the fast recovery state."

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