本书详细介绍了在Cisco路由器上实现TCP/IP的技术和配置实例。主要内容有：路由器基础、TCP/IP通信、TCP/IP上使用的路由协议、对Cisco路由器的配置、Cisco对传统局域网和流行广域网技术的支持、一个基于TCP/IP的互连网络实例以及故障排除技术等。本书新增了有关Cisco硬件特性、VPN的实现、管理和安全性，以及IOS防火增特性等新内容，书中的所有配置实例已全部更新为使用Cisco IOS 11.0和12.0版本。本书易于理解，适合于初学者参考，也适合经验丰富的网络专业人员使用。-The book described in detail in the Cisco routers to achieve TCP/IP technology and configuration examples. The main contents are as follows: router basis, TCP/IP communications, TCP/IP routing protocol used on Cisco router configuration, Cisco LAN and prevalence of traditional wide area network technology, based on TCP/IP interoperability even the network examples and troubleshooting technology. This book added on the Cisco hardware features, VPN realization, management and security, as well as by features such as IOS fire new content, all the configuration examples of the book have all been updated to use the Cisco IOS 11.0 and 12.0 versions. This book easy to understand, is suitable for beginners and reference, but also suitable for experienced network professionals.