This CCNA site has a lot of good links to more information about TCP/IP and the issues with it.
The Cisco Press books are good and most are available as pdf . From the TCP/IP First Step book to the very comprehensive 2 volume ‘Routing TCP/IP’ they cover all aspects, depending on your existing knowledge level.
The TCP/IP guide online is where I go for a lot of answers to questions. You can get an electronic or hard copy also.
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