以下关于虚拟专用网VPN描述错误的是（ ）。
- A.VPN不能在防火墙上实现
- B.链路加密可以用来实现VPN
- C.IP层加密可以用来实现VPN
- D.VPN提供机密性保护
正确答案及解析
正确答案
解析
本题考查VPN相关知识。
VPN中文翻译为虚拟专用网，其基本技术原理是把需要经过公共网传递的报文加密处理后，再由公共网络发送到目的地。利用VPN技术能够在不信任的公共网络上构建一条专用的安全通道，经过VPN传输的数据在公共网上具有保密性。VPN和防火墙有3方面的关系：VPN和防火墙都是属于网络安全设备；VPN设备可集成在防火墙设备内；VPN和防火墙的功能不同。故本题选A。
VPN的安全服务有三种：保密性服务、完整性服务、认证服务。VPN多种实现技术可分为三种：链路层VPN、网络层VPN、传输层VPN。
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