The Transmission Control Protocol (TCP) is a transport protocol, as it dictates the way data is sent and received. Before transmitting data, TCP opens a connection with the recipient and ensures that all packets arrive in order once the transmission begins. It is via TCP that the recipient acknowledges receiving each packet that arrives. Missing packets are sent again if receipt is not acknowledged. Hence this is a reliable protocol, but not fast.
TCP and IP were originally designed to be used together, and these are often referred to as the TCP/IP suite. However, other transport protocols can be used with IP. The TCP header has a default size of 20 bytes. Up to 40 bytes of options can be added.
TCP flow
Step 1: Establish the connection TCP needs a valid connection as a prerequisite. To establish a connection, it follows a three-way handshake method. ƒ First, the requesting client sends the server a SYN packet
• SYN: SYN stands for synchronise.
• SEQ: SEQ is a unique, random number that ensures full transmission in the correct order and without duplicates.
Once the server has received the packet, it agrees to the connection by returning a SYN-ACK packet. The ACK includes the client’s sequence number plus 1. The client will send some random SEQ number.
• ACK: ACK stands for acknowledging its own sequence number to the client.
Finally, the client acknowledges the receipt by sending its own ACK packet, which in this case contains the server’s sequence number plus 1. The client can now begin transferring data to the server.
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