Fortunately, this is not the typical High Speed Newtworks book. Unlike most authors, Stallings goes as deep as required. Beginning with descriptions for ATM and high speed LANs, the book explain how to modelate and estimate the actual network performance, by using statistics models. (An overview of probability and stochastic processes is included).
The mechanisms for improve the network performance (as different queueing strategies), and managing network congestion are explained.
Some IP related topics (routinng protocols, RSVP, Multicast)are also included.
Part 7 (optional for most readers) is concerned with compression and information theory (JPEG and MPEG algorithms are explained).
As you see, a serious book, not a "bubbleware" book.