按照VPN在TCP/IP协议层的实现方式，可以将其分为链路层VPN、网络层VPN、传输层VPN。以下属于网络层VPN实现方式的是（ ）。
- A.多协议标签交换MPLS
- B.ATM
- C.Frame Relay
- D.隧道技术
正确答案及解析
正确答案
解析
数据链路层VPN的实现方式有ATM、Frame Relay、多协议标签交换MPLS；网络层VPN的实现方式有受控路由过滤、隧道技术；传输层VPN的实现方式有SSL技术。而有些资料中，将多协议标签交换MPLS，看成介于数据链路层和网络层的2.5层协议。
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