Chapter 18. TCP Connection Establishment and Termination
Introduction
TCP is a connection-oriented protocol. Before either end can send data to the other, a connection must be established between them. In this chapter we take a detailed look at how a TCP connection is established and later terminated.
This establishment of a connection between the two ends differs from a connectionless protocol such as UDP. We saw in Chapter 11 that with UDP one end just sends a datagram to the other end, without any preliminary handshaking.
Connection Establishment and Termination
To see what happens when a TCP connection is established and then terminated, we type the following command on the system svr4:
svr4 % telnet bsdi discard Trying 140.252.13.35 ... Connected ...Get TCP/IP Illustrated, Volume 1: The Protocols now with the O’Reilly learning platform.
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