Explain the TCP connection establishment using a three way handshake mechanism.

Explain the TCP connection establishment using a three way handshake mechanism.
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Answer :

Connection Establishment

TCP uses a Three way handshaking mechanism to establish a connection between client and server machines. The three steps in three way handshaking mechanism are as follows. 

SYN:

The client sends the first segment, a SYN segment, in which only the SYN flag is set. This segment is for synchronization of sequence numbers.

SYN + ACK

The server sends the second segment, a SYN +ACK segment, with 2 flag bits set.

ACK

The client sends the third segment. This is just an ACK segment. It guarantees the completion of three way handshaking.

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