Cisco Systems, Inc. is the leading global supplier of internetworking solutions, including routers, LAN and ATM switches, dial-up access servers, and network management software. This core of this book is a collaboration of multiple authors and experts over time to develop the ultimate and definitive course in Cisco router configuration, making this guide a perfect choice candidates pursuing Cisco networking certifications. Michael Wenstrom is an education specialist in the Security Internet Services Training Unit at Cisco Systems. He has over 15 years experience in training development, technical writing, and the networking and telecommunications industry. Michael contributed to the development of the most recent version of the MCNS course, upon which this book is based.