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Tcp connection termination

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

TCP connection termination is the process of closing a TCP connection after the necessary data has been exchanged.

TCP connection termination closes a connection after data exchange. Each host sends a segment with the FIN flag and acknowledges the other host’s FIN with ACK. section 22.2.1

The usual termination sequence is:

PC1 and SRV1

After PC1 and SRV1 finish exchanging data, PC1 sends FIN. SRV1 returns ACK, sends FIN when ready, and PC1 returns ACK.

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes
Defines the usual four-message FIN-and-ACK sequence but does not detail exceptional termination behavior.
Examples
Uses PC1 and SRV1 exchanging FIN and ACK segments in a four-way handshake.
What it assumes
Assumes basic TCP connection establishment and data exchange, while defining FIN and ACK behavior.
What you can do after
Evaluate TCP packet sequences by identifying FIN segments, their ACKs, and the usual four-way closure.
How it connects
Connects TCP connection termination with connection establishment, data exchange, TCP flags, FIN, ACK, and the three-way handshake.
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Related concepts

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