Via Sam Gentile, via Peter Drayton, this looks like a good introduction to TCP/IP.
Everyone knows that TCP/IP is a network protocol used on LANs, WANs and the Internet, but not everyone who uses it understands how it works. It's possible to use TCP/IP with little more than a knowledge of how to configure the protocol stack, but a better understanding will give you a clearer picture of what is going on in your network and why the protocol needs to be set up in a particular way.
The aim of this multi-part article is to explain the key concepts behind TCP/IP.
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