Rating: 
Summary: Useless
Review: Way too many critical errors. Errors in the diagrams, even errors in the answers to the study questions. DO NOT BUY THIS BOOK. Use Doyle or Caslow and CCO to study for the exam.
Rating:
Summary: Poorly writted (poor grammer, full of mistakes)
Review: When I first scanned through the book, I thought it was worth it to purchase due to its intensive amount of detail on various internetworking protocols at many of the OSI layers. However, as I started to read the various chapters I got a different impression. First, as many others have noted, the book is riddled with mistakes, both syntax errors and flawed "facts". Granted, no book is ever perfect on first print in this sense (I've even found a few mistakes in the Cisco Press books), but this one went well beyond the flaws I've seen in other books. The author and publisher obviously did a very poor job of proof-reading. Second, some of the grammar and explanations in the book were poor. For example, some sentences/paragraphs tended to contradict each other. Others were sometimes very vague in their explanation of a concept or technology. I am not a novice in this field, having done network engineering and have an in-depth knowledge of protocols such as TCP/IP, and network devices and architecture. In short, a major re-editing of this book is required before I even pay a dime for it.
Rating: 
Summary: Good amount of material but poorly written
Review: While this book covers the material that is on the CCIE written exam, the writing style is fairly choppy, sometimes vague and often hard to follow.However, if you are looking for a one stop shop for helping you prepare for the written exam than this has it all. Please note that you aren't going to become a CCIE with this book, it takes a few years of real-world experience in multiprotocol networking environments. You aren't going to get that from a book or a class. Use this book as a supplement to Radia Perlman's "Interconnections" and Chris Lewis' Cisco TCP/IP Networking Reference. Both of these are top notch books that are a must read for those pursuing the CCIE.
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