The third edition of this best-seller, with updates and improvements throughout, presents the details about TCP/IP protocols that are not covered in Volume I. It provides an in-depth look at individual TCP/IP protocols in light of design alternatives, implementation techniques with actual ANSI C Code, and the internals of protocol software. To enable the reader to clearly understand the interaction among protocols, the complete implementation process, and the internal structure, the authors use a working system, designed and built by them using ANSI C, that serves as a central example throughout the text. This text is suitable for courses in networking for engineering students of computer science and is a must for programmers working with TCP/IP suite of protocols.