This is the only Cisco-authorized companion guide to the official Cisco Networking Academy curriculum for the new CCNA Version 5 certification. An invaluable resouce for hundreds of thousands of Cisco Networking Academy students worldwide, this portable desk reference is ideal for anytime/anywhere take-home study and reference. Fully aligned to CNA's online course chapters, it offers additional book-based pedagogy to reinforce key concepts, enhance student comprehension, and promote retention. Using it, students can focus scarce study time, organize review for quizzes and exams, and get the day-to-day reference answers they're looking for. The Companion Guide also offers instructors additional opportunities to assign take-home reading or vocabulary homework, helping students prepare more for in-class lab work and discussions. A companion CD-ROM contains additional visual and interactive learning aids designed to accelerate mastery and deepen understanding.