this site is very helpful , especially if you want to learn more about the internet .


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Welcome! The Internet Encyclopedia is my attempt to take the Internet tradition of open, free protocol specifications, merge it with a 1990s Web presentation, and produce a readable and useful reference to the technical operation of the Internet.


http://www.freesoft.org/CIE/index.htm

QUOTE
Full text search of Connected: An Internet Encyclopedia and all RFCs 
100+ Internet engineering essays 
Five-part Programmed Instruction Course (good DNS section) 
     
Every RFC ever published 
Questions readers have asked (with answers) 
Other sites to check out 
     
The Encyclopedia is mirrored around the world; find a copy close to you

In the free software tradition, everything is available for download


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http://www.private.org.il/tcpip_rl.html