Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-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 framework that is commonly used in VPNs,to provid secure end-to-end communication?（）
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