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I came across an unjustified statement in my study notes regarding TCP:

If sender receives 3 duplicate ACKS back-to-back, it assumes that the next packet in sequence was lost, and re-transmits.

Is this statement correct and if so how is it justified?

  • There are multiple questions and answers about that here, e.g. the above linked question and answer. You may want to search for more. – Ron Maupin Apr 23 at 22:40