Which protocol is an open standard protocol frame work that is commonly used in VPNs，to provid secureend-to-end communication？（）
- A、L2TP
- B、IPsec
- C、PPTP
- D、RSA
正确答案:B
答案解析:有
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Which protocol is an open standard protocol frame work that is commonly used in VPNs，to provid secureend-to-end communication？（）
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