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Authentication Header (AH) provides data integrity, data origin authentication, and an optional anti-replay service.

Encapsulating Security Payload (ESP) provides confidentiality, data origin authentication, data integrity, and an optional anti-replay service.

Internet Key Exchange (IKE) is used to set up a secure, authenticated communications channel by negotiating cryptographic parameters.

Security Association (SA) defines the parameters for secure communication between two network entities.

Internet Security Association and Key Management Protocol (ISAKMP) provides a framework for authentication and key exchange.

Security Policy Database (SPD) specifies what traffic should be protected by IPsec and the specific parameters for protection.

Security Association Database (SAD) contains parameters for each SA, including encryption and authentication keys.

Internet Key Exchange version 2 (IKEv2) is the second-generation protocol for negotiation of SAs and key exchange.

NAT Traversal (NAT-T) allows IPsec traffic to pass through NAT devices by encapsulating IPsec packets in UDP.