虚拟专用网( Virtual Private Networking， V P N )是将I n t e r n e t作为计算机网络主干的一种网络模式。 面上它似乎不那么令人喜欢，但深入研究就会发现，它提供了巨大的潜力。利用V P N，很多企 能够省下一大笔为已有网络租用线路的费用。使用V P N不需要到处布置站点，只需将它们放置 你所在的城镇即可。事实上，构造V P N的技术也可用于你所在大楼中的局域网( L A N )上。

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