Connectionless Integrity and Data Origin Authentication of IP Packets

B.

The protocol that provides connectionless integrity and data origin authentication of IP packets is the Authentication Header (AH).

AH is an Internet Protocol Security (IPSec) protocol that provides connectionless integrity and data origin authentication for IP packets. It ensures that the data in the IP packet has not been tampered with during transmission and that the sender of the packet is authenticated.

AH provides protection for the entire IP packet, including the IP header and the data payload. It uses a message authentication code (MAC) algorithm to generate a checksum for the packet, which is included in the packet header. The receiver of the packet can use the same algorithm to generate a checksum for the packet it received, and compare it with the checksum in the packet header to verify the integrity of the packet.

In addition to providing integrity protection, AH also provides data origin authentication, which means that the receiver can be sure that the packet was sent by the expected sender. AH achieves data origin authentication by including a cryptographic hash of the packet's source IP address in the packet header.

The other protocols listed in the options are as follows:

• ESP (Encapsulating Security Payload) is another IPSec protocol that provides confidentiality, authentication, and integrity protection for IP packets.
• IKE (Internet Key Exchange) is a protocol used to establish IPSec security associations (SAs) between two devices, allowing them to securely communicate with each other.
• ISAKMP (Internet Security Association and Key Management Protocol) is a protocol used to establish SAs and manage the exchange of keys for IPSec communication.

Therefore, the correct answer to the question is option B. AH.