CCNA Exam Certification Guide, Third Edition is a comprehensive late-stage study tool for CCNA exam preparation. Complete coverage of all exam topics as provided by Cisco Systems®, the creators of the exam, ensures readers will arrive at a complete understanding of what they need to master to succeed on the exam. Every chapter of CCNA Exam Certification Guide, Third Edition has been completely revised to bring the content up to date and increase it's readability and reference. Key updates and additions include hands-on lab exercises to help increase a user's confidence in their ability to apply concepts, updates to LAN, Subnetting and Frame Relay sections, "Extra Credit" sections that highlight content that is above and beyond the scope of the exam but critical for CCNA engineers to know in their daily jobs, new appendix on subnetting, one of the more difficult areas of the exam, and more.