AH, ESP, IKE

In IPsec (Internet Protocol Security), Authentication, Integrity, and Confidentiality are provided by the following components:

1. Authentication Header (AH): Provides authentication and integrity without encryption. It ensures that the data received has not been tampered with and comes from the expected sender.

2. Encapsulating Security Payload (ESP): Provides authentication, integrity, and confidentiality by encrypting the data payload. It ensures that the data is not only authentic and integral but also confidential and protected from eavesdropping.

3. IKE (Internet Key Exchange): A protocol used to set up a security association (SA) in the IPsec protocol suite. It is used to negotiate cryptographic keys for secure communication.

Therefore, the correct answer in this context would be ESP (Encapsulating Security Payload).