Routing Protocols and Concepts CCNA Exploration Companion Guide (With CD) is a comprehensive book for networking professionals. The book is the official supplemental textbook for the Routing Protocols and Concepts course in the Cisco Networking Academy, CCNA Exploration syllabus. Designed by Networking Academy instructors, this book helps readers understand the architecture, components, and operation of routers. In addition, the book contains important questions which challenge the readers to apply the concepts in a way which will help them succeed in the examination. The book is an indispensable resource for all CCNA aspirants and the companion CD Rom brings readers additional guides, notes and exercises to help them gain an edge over the competition.