ABOUT THE AUTHORTODD LAMMLE, Cisco certified in almost every category, is the authority on Cisco networking and certification. His three decades of real-world experience is prevalent in his writing. He is an experienced networking engineer with very practical experience working on the largest bounded and unbounded networks in the world at such companies as Xerox, Hughes Aircraft, Texaco, AAA, Cisco, and Toshiba, among many others. Todd has published over 60 books, including the very popular and bestselling CCNA Routing and Switching Study Guide. Todd runs an international training company from Texas, and a large-scale consulting business out of Colorado. You can reach Todd through his forum and blog at www.lammle.com/ccna.Wiley has partnered up with Practice Labs, the IT Competency Hub, to give IT learners discounted access to their live, virtual Practice Labs. Connect to real devices using actual hardware and software straight from a web browser. Practice labs allow you to cement your theoretical studies with practical, hands-on experience. Master your IT skills and gain virtual world experience to increase your employability. Each purchase provides 6 months' unlimited access. Ready to practice your IT skills?