This book takes a pragmatic, hands-on approach to teaching advanced modern networking concepts from the network administrator's point of view. It introduces each new concept in clear, easy-to-understand language, explaining how each technology is used, and reinforcing every idea and technique with practical examples and exercises. Readers will learn how to design, configure, and manage campus networks, connect networks to the Internet, and apply advanced networking technologies. They will learn today's most valuable techniques for designing network infrastructure; configuring routers with RIPv2, OSPF, EIGRP, IS-IS, and BGP; using network management and analysis tools; running IPv6; networking Linux; securing networks, and using VoIP. This new Third Edition has been revised and reorganized to focus on introductory topics. A new chapter on network infrastructure design has been added. Network management coverage has been expanded significantly; for example, a new chapter on analyzing network data traffic has been added. The book's chapter on network security has been expanded to cover router and switch security, intrusion detection/prevention, VPNs, and wireless security. A new chapter has been added on IPv6 and the BGP coverage has been expanded. VoIP coverage has been updated, and a new chapter has been added on advanced networking that covers planning, appliances, technologies, and wireless networking.