在详细介绍VPN技术的概念、工作原理、实现方案之关键技术等基础上，并对这项技术的应用、发展现状，及市场前景做了的分析。%This paper describs in detail on the basis of VPN technology concept, working principle, key technology of implementation scheme and so on. It analyzes application, development status and market prospect of this technology.
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