What is involved in the 3 way handshake (TCP)? — SYN=1 - synchronize, gives a Seq number and expects that number + 1 in response ACK=1 - sent by acknowledging server with incremented number, who also sends a SYN=1 and a Seq SYN=0 ACK=1 and the Seq (incremented number) back to the server Now you're talking!