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本文对 ＶＰＮ（Ｖｉｒｔｕａｌ Ｐｒｉｖａｔｅ Ｎｅｔｗｏｒｋ）的概念、分类及常用技术作了基本介绍和评述，并以 Ｗｉｎｄｏｗｓ ＮＴ为例，介绍了ＶＰＮ的实际实现方案。
In this paper, the concept, classification and common technology of VPN are introduced and reviewed. Taking Windows NT as an example, the actual implementation scheme of VPN is introduced.