For excellent reference material on Internetworking .... read on :

Internetworking Technology Handbook

Internetwork Design Guide

Internetworking Terms and Acronyms

Internetworking Case Studies

Happy networking !!!
Amit Ray.

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. (Rich Cook)