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（请给出正确答案）
( ) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network。
A.Certificate
B.Encryption
C.Tunnel
D.Presentation
B.Encryption
C.Tunnel
D.Presentation
参考答案
参考解析
解析：加密可确保私有网络中两个端点间的保密性、完整性和认证性。
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