Which IPsec security protocol should be used when confidentiality is required?
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A. B. C. D.D
The correct answer is D. ESP (Encapsulating Security Payload).
IPsec (Internet Protocol Security) is a protocol suite used to provide secure communication over IP networks. IPsec can be used to provide confidentiality, integrity, and authentication of network traffic. There are two main IPsec protocols: Authentication Header (AH) and Encapsulating Security Payload (ESP).
AH provides authentication and integrity for IP packets, but it does not provide confidentiality. In contrast, ESP provides confidentiality, as well as authentication and integrity, by encrypting the entire IP packet.
MD5 (Message Digest 5) is a hash function used for integrity checking, but it does not provide confidentiality. PSK (Pre-Shared Key) is a method of authentication, but it does not provide confidentiality.
Therefore, the correct answer is D. ESP, as it provides both confidentiality and authentication/integrity for IP packets.