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Which protocol offers data integrity, encryption, authentication, and antireplay functions for IPsec VPN?
Correct Answer: B
Explanation IP Security Protocol-Encapsulating Security Payload (ESP) Encapsulating Security Payload (ESP) is a security protocol used to provide confidentiality (encryption), data origin authentication, integrity, optional antireplay service, and limited traffic flow confidentiality by defeating traffic flow analysis. http://www.ciscopress.com/articles/article.asp?p=24833