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The TCP Connection (Revisited)
In the last several lectures, discussion of how an application
protocol operates invariably starts with the phrase:
...the client process opens a TCP connection to a
server, at port number xx...
In this lecture, we examine what this really means from the
perspective of a programmer writing a TCP-based client or (more
complex) a server.
In a major change from previous years, we will use the
Java programming language for our examples.
Previously we used C, the standard system-level
programming language on Unix systems. You should be aware that the
concepts we will introduce in today's lecture were originally (like
most Internet protocols) developed in a Unix environment, and still
retain some of the flavour of Unix -- that is, when you
occasionally wonder why the designers took a particular approach,
the answer is quite likely "...that's how it's done in
Unix..
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