Transmission Control Protocol | TCP Header Format

In this video we will see complete header fields of Transmission Control Protocol (TCP). As we know when data comes from the application layer it goes to the transport layer in the TCP/IP model. And we have seen in earlier videos how transport layer provide services like End-to-End Connection, Reliability, Flow Control, Congestion Control, Addressing and Multiplexing. To manage all these services TCP adds 20 to 60 bytes of additional information called header.

We will understand various fields in the TCP segment header like source port address, destination port address, sequence number, acknowledgement number, header length, flags like URG for urgent data, ACK for acknowledgement, PSH for push, RST for reset, SYN for synchronization, FIN for termination of connection, window size, checksum, urgent pointer and options. At the end of this video we will see practically how TCP header looks in the packet capturing tools like wireshark for complete understanding about TCP header.

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