Computer Networks (3rd Edition) Tanenbaum, Andrew S.

Primarily intended for junior/senior or graduate level courses in computer networks, data networks, or distributed processing in CS or EE departments. Also useful (with selective omission of sections or chapters) for less advanced students. This is the first book that explains how computer networks work inside, from the hardware technology up to and including the most popular Internet application protocols. While students are not expected to have a background in computer networks or advanced mathematics, a general background in computer systems and programming is assumed.