Title: Great practical guide, missing conceptual background
Review: Overall, I would say, this is an great on the job reference. You'll find page after page of detailed and practical configurations, and all the debug and show commands that'll help troubleshoot a WAN configuration gone wrong. If you're looking for an on the job reference, or as the author said, a CCIE study guide, then this is a great addition to your collection. However, I gave it four stars, because it was also toted as a good prep for the BCRAN/CTMD, and I thought it lacked the in depth conceptual explanations that so many of the test objectives cover. If you're looking for a guide to prepare for either of these tests, you'll either have to supplement this book with material from cisco.com, or get the Cisco Press book.
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