You might want to take a look at "Computer Networks" by A.S. Tanenbaum and D.J. 
Wetherall.  It's available for free online at 
    
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxza21pbmh8Z3g6NjQxMTI2MmYxMTAwZmNjZQ

Or you can buy a copy from your local bookseller.

Enjoy!
Rick

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