Alice and Bob are tasked to integrate a Check Point IPsec VPN solution.

The correct answer isD. In an IPsec VPN, confidentiality, also described by Check Point documentation as privacy, means that VPN data is encrypted so unauthorized parties cannot read the traffic as it crosses an untrusted network. Check Point’s R82 Site-to-Site VPN guide states that the VPN tunnel guarantees authenticity through standard authentication methods, privacy because all VPN data is encrypted, and integrity through industry-standard integrity assurance methods. Option A is wrong because “uses standard authentication methods” describes authenticity, not confidentiality. Option B is wrong because integrity is not the same as encryption; integrity verifies that traffic was not altered in transit. Option C is wrong because authenticity validates peer identity and trust, not data encryption. The correct security-property mapping is:authenticity = peer authentication, confidentiality/privacy = encryption, integrity = tamper detection. This is foundational IPsec terminology and is directly tested in Check Point VPN design questions. Reference topic:Introduction to Site-to-Site VPN / VPN tunnel guarantees.

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