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Windows Server® 2008 TCP/IP Protocols and Services by Joseph Davies

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TCP Connection Termination

Just as the TCP connection establishment process requires the sending of a SYN segment and its acknowledgment, the TCP connection termination process requires the sending of a FIN (Finish) segment, a TCP segment in which the FIN flag is set, and its acknowledgment. The FIN segment indicates that the FIN segment sender will send no more data on the connection. Because a TCP connection is made of two logical pipes (an outbound and inbound pipe for each TCP peer), both pipes must be closed and the closure must be acknowledged. Figure 11-5 shows a TCP connection termination.

A TCP connection termination showing the exchange of four TCP segments

Figure 11-5. A TCP connection termination showing ...

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