IPSec Architecture uses these individual protocols:

AH: Authentication Header is a protocol within IPSec that guarantees the integrity and authentication of the IP Packet sender.

ESP: Encapsulation Security Payload provides both data authentication  and encryption for the sender.IKE: Internet Key Exchange is the protocol responsible for managing the exchange of encryption keys between hosts.

Oakley: A protocol that uses Diffie-Hellman to create master and session keys.ISAKMP: Internet Security Association Key Management Protocol facilitates encrypted communication between endpoints.