It is broad, refined, and accurate. This is easily one of the best networking books of the decade. Feit's prose is a model of technical writing.
Every sentence states a fact.
Every fact is germane to the discussion, and proceeds smoothly from what came before. The author has as close to an exhaustive knowledge of the subject as could be desired by the most exigent reader, and is expert at demonstrating how disparate elements fit together. By the standards of contemporary American computer engineering literature, this book is above criticism. Cognoscenti such as network administrators and router technicians already up to the elbows in IPv4 might consider this book as their heads-up on IPv6. It has taken most of a decade to assemble this material into the present form.