TCP

tcp-3-way-handshake

TCP (Transmission Control Protocol)

TCP (Transmission Control Protocol) is the most important Transport Layer Protocol. It is also one of the important Protocols of network world. TCP is used in many cases in the computer networks. Here, we will focus on an overview of this important Protocol.

First of all, TCP is a Connection Oriented Transport Protocol. A TCP session must be established to use TCP. This TCP Session is established with a Three-way Handshake mechanims. And it can be terminated with a Four-way Handshake mechanism.

Three-way Handshake mechanism consist of three messages as its name implies. These Messages are :

• SYN
• SYN-ACK
• ACK


tcp-3-way-handshake

Four-Way Handshake mechanism consist of two messages sent fom both ends, in total 4 message is sent. These messages are :

• FIN
• ACK


tcp-4-way-handshake

TCP is a Secure and Reliable Protocol. TCP guarantees the Transport of the data. It controls the bits with ACK mechanism and if are there any missing bits it Retransmits these missing bits. So, it prevent data loose. TCP is for the applications that require high reliability.


tcp-ack-mechanism

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