下列关于VPN的叙述中,错误的是
A.VPN是将物理上分布在不同地点的网络,通过专用网络连接而成的虚拟予网
B.VPN技术采用鉴别、访问控制、保密性、完整性等措施,防止信息被泄露、篡改和复制
C.按照实现原理划分,VPN可以分为重叠VPN和对等VPN技术
D.VPN利用已有的公网建立专用数据传输通道,从而实现点到点的连接
正确答案是A
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