TCP takes 3 RTT time I have read from one stack overflow answer to make a connection with server. We know that TCP takes triple (Syn, Syn/Ack, Ack) to make a connection by 3-way handshake with server. But 3 RTT don't understand this.

1 Answer 1


The triple handshake take three single trips between the connection partners A and B:

  1. A->B: SYN
  2. B->A: SYN+ACK [A is fully synchronized after receiving B's SYN/ACK]
  3. A->B: ACK [A can already send data through the socket right after ACKing B's sequence number]

A round trip is both ways: A->B->A.

Assuming A->B and B->A delays are equal, the triple handshake takes exactly 1.5 RTT.

  • why the answer is saying 3Rtt?
    – S. M.
    Sep 22, 2021 at 19:50
  • 1
    @AlokMaity You'll need to ask the author...
    – Zac67
    Sep 22, 2021 at 20:00

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.