Learn the concepts on the new CCNA 640-801 and ICND 640-811 exams with the only Cisco authorized self-study guide Master ICND with the Second Edition of the best-selling self-study guide for CCNA Complement instructor-led learning with materials developed in conjunction with Cisco Systems Understand concepts taught via a variety of new and proven learning feature With the introduction in June 2003 of the CCNA 640-801 and ICND 640-811 exams, Cisco Systems also introduced the newest version of the Interconnecting Cisco Network Devices (ICND) course. CCNA Self-Study: Interconnecting Cisco Network Devices (ICND), Second Edition is a Cisco authorized self-paced learning tool that helps CCNA candidates prepare for the new CCNA exams. This book is the second edition of the best-selling title for early-stage CCNA preparation. It is designed in exclusive cooperation with Cisco Systems, and it is the only title authorized by Cisco for self-study learning of the ICND course concepts. Coverage includes a review of the OSI model, routers and switches, Cisco IOS software, command line interface, WAN, and ISDN and Frame Relay. The CCNA program certifies that a professional can install, configure, and operate LAN, WAN, and dial access services for small networks (100 nodes or fewer). It is considered one of the most valuable IT certifications and has been growing in popularity over the last several years.