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单项选择题Which of the following are suitable protocols for securing VPN connections at the lower layers of the OSI model?在OSI的低层模型中,以下哪项协议适合用于VPN的安全连接()

A、PKCS#10 and X.509

B、TLS and SSL

C、IPsec and L2TP

D、S/MIME and SSH

  • C
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