Three-Way Handshake

It is a method used by TCP to SET UP a connection

Steps

  1. Host A sends a SYN packet

  2. Host B sends a SYN-ACK packet

  3. Host A sends ACK packet

Then TCP socket connection is ESTABLISHED

SYN and ACK

SYN stands for synchronize ACK stands for acknowledge

SYN and ACK messages are indicated by a either the SYN bit, or the ACK bit inside the TCP header SYN-ACK message has both the SYN and the ACK bits turned on (set to 1) in the TCP header.

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