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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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Chapter 11. Overview of TCP/IP

IP version 6: All the pain of version 4, plus brand-new problems!

Securing a computer is easy: Disconnect it from all networks, remove all input and output, and lock it in a bunker. Oh, wait—did you want the system to do something? Then you’ll probably want to connect your system to the Internet.

Many system administrators have a vague familiarity with the basics of networking, but to be a truly competent sysadmin, you need a real understanding of how everything fits together. You don’t need to know when to use rapid spanning trees, how to choose between BGP and OSPF, or even what those acronyms represent. ...

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