虚拟专用网的创建与实现:本书系统介绍了虚拟专用网的概念、起源、配置、实现和维护，还对虚拟专用网体系结构、加密工具、有关限制、防火墙结构等内容进行了探讨，并提供了大量实例。本书是网络、MIS管理员必备的参考书。

-Virtual Private Network creation and realization : this book system introduced Virtual Private Network concept, the origin, distribution, implementation and maintenance, also Virtual Private Network Architecture, encryption tools, the restrictions, firewall structure on the content and provide a lot of examples. The book is network and MIS managers indispensable reference book.