CiscoPress's "Cisco DQOS Exam Certification Guide" by Odom is a best-of-class book. The book is not for the meek - weighing in at over 850 pages, the book is a sizable investment of time and energy to properly appreciate. While the book was mainly written to be utilized for a few QoS exams, I'd expect to see this book on the bookshelf of many CCIEs or CCIE wannabes (including myself).



The beauty of this book is that it covers QoS in a depth that is not equaled elsewhere. For example, the book's first chapter, simply an overview of QoS, is almost 80 pages (some overview)! The first chapter succinctly describes the differences and nuances of the enemies of QoS - delay, jitter, bandwidth and packet loss. The second and third chapters do a great justice at trying to explain the dizzying array of tools available to adjust QoS - the different classes of tools and the differences between classification and marking. And so forth..., each chapter does a great job at explaining the mysteries of QoS.



Of course, with any book of such complexity, typos must be expected. Two typos that I noticed are:

-on page 333, I believe the correct Bc should be 93.75ms.

-on page 456, FRED can match on layer 4, not layer 3 protocols



If I had a `Top 10' for books that I feel would be necessary for the CCIE, I would place this book on the list. I have not been able to find the same explanations for QoS on Cisco's website or in other networking books.



I give this book 5 pings out of 5:

!!!!!