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讨论了当前计算机网络发展的热点技术：虚拟专用网（ＶｉｒｔｕａｌＰｒｉｖａｔｅ Ｎｅｔｗｏｒｋ）。论述了用虚拟专用网来组建新的Ｅｘｔｒａｎｅｔ安全体系结构，从而带来更好的网络性能和应用前景。
Discussed the current hot technology of computer network development: Virtual Private Network (Virtual Private Network). Discussed the use of virtual private network to build a new Extranet security architecture, resulting in better network performance and application prospects.