TCP Transmission Control Protocol is the main protocol that is been used in the networking.

It is mainly being used for the data transmission in the communication network.

• TCP is reliable protocol. This means if data gets lost in any case the acknowledgement is being sent to the sender who sends the data and resending is been done.

• TCP ensures that the sequencing of the data is maintained.

• TCP is connection based protocol. It requires that the connection should be established before any communication can take place

• TCP provides error-checking and recovery mechanism.

• TCP provides end-to-end communication.

• TCP provides flow control and quality of service.

• TCP operates in Client/Server point-to-point mode.

• TCP provides full duplex server, i.e. it can perform roles of both receiver and sender.

• Source Port (16-bits) 

• Destination Port (16-bits)

• Sequence Number (32-bits)

• Acknowledgement Number (32-bits)

• Data Offset (4-bits)

• Reserved (3-bits)

• Flags (1-bit each)

TCP communication works in Server/Client model. The client initiates the connection and the server either accepts or rejects it. Three-way handshaking is used for connection management.