Mike Meyers’ CCNA 3.0 Certification Passport (New Exam 640-607) is the sort of book you buy when you’re studying for the Cisco Certified Network Associate (CCNA) certification even though you feel like you learned everything you need to know at work.

 It’ll help you solidify your knowledge in your areas of experience, and fill the gaps in your knowledge–provided they’re not too big. You’ll be disappointed if you’re expecting to learn the entire CCNA knowledge base from this book–or any other–but then you deserve to be. This book, like the CCNA itself, is for experienced professionals for whom the CCNA exam is a proof of competency, not a goal unto itself.