Which protocol suite provides data security by using Encapsulating Security Payload (ESP), Authentication Header (AH), and Internet Key Exchange (IKE) to secure communication between VPN endpoints?

Which protocol suite provides data security by using Encapsulating Security Payload (ESP), Authentication Header (AH), and Internet Key Exchange (IKE) to secure communication between VPN endpoints?

• A. Encapsulating Security Payload (ESP)
• B. Authentication Header (AH)
• C. IKE
• D. IPsec

Answer: (D)

IPsec provides data security for VPN endpoints by protecting IP packets as they traverse an untrusted network. It is a protocol suite that combines two security protocols—Encapsulating Security Payload (ESP) and Authentication Header (AH)—with a key management protocol, Internet Key Exchange (IKE). ESP is used to encrypt the payload, offering confidentiality and optional integrity/authentication. AH provides data integrity and authentication for the entire packet but does not encrypt the payload, so it’s more limited in terms of confidentiality. IKE handles negotiating and establishing the cryptographic keys and security associations that ESP and AH rely on, automating the setup of secure tunnels between endpoints. Putting these components together creates the secure VPN communication: ESP for encryption, AH for integrity/authentication, and IKE for managing the keys and relationships between the endpoints. The other items are individual parts of this system or a separate protocol, whereas IPsec is the complete suite that integrates ESP, AH, and IKE to secure VPN traffic.

IPsec provides data security for VPN endpoints by protecting IP packets as they traverse an untrusted network. It is a protocol suite that combines two security protocols—Encapsulating Security Payload (ESP) and Authentication Header (AH)—with a key management protocol, Internet Key Exchange (IKE). ESP is used to encrypt the payload, offering confidentiality and optional integrity/authentication. AH provides data integrity and authentication for the entire packet but does not encrypt the payload, so it’s more limited in terms of confidentiality. IKE handles negotiating and establishing the cryptographic keys and security associations that ESP and AH rely on, automating the setup of secure tunnels between endpoints. Putting these components together creates the secure VPN communication: ESP for encryption, AH for integrity/authentication, and IKE for managing the keys and relationships between the endpoints. The other items are individual parts of this system or a separate protocol, whereas IPsec is the complete suite that integrates ESP, AH, and IKE to secure VPN traffic.