This is my 1st presentation on 24/07/2009 at 3 pm with cik Marina.

3 way handshake

The three-way handshake in Transmission Control Protocol - TCP (also called the three message handshake) is the method used to establish and tear down network connections. This handshaking technique is referred to as the 3-way handshake or as "SYN-SYN-ACK" (or more accurately SYN, SYN-ACK, ACK).

• SYN = Synchronize
• ACK = Acknowledge

The TCP handshaking mechanism is designed so that two computers attempting to communicate can negotiate the parameters of the network connection before beginning communication. This process is also designed so that both ends can initiate and negotiate separate connections at the same time.

Host A sends a TCP SYNchronize packet to Host B

Host B receives A's SYN

Host B sends a SYN-ACK

Host A receives B's SYN-ACK

Host A sends ACK

Host B receives ACK. TCP connection is ESTABLISHED