在IPSec虚拟专用网当中，提供数据源认证的协议是（ ）。
- A.SKIP
- B.IP AH
- C.IP ESP
- D.SAKMP
正确答案及解析
正确答案
解析
参见《信息安全工程师5天修炼》VPN部分。认证头（Authentication Header，AH）协议是IPSec体系结构中的一种主要协议，它为IP数据报提供完整性检查与数据源认证，并防止重放攻击。
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