Fill in the blank with the appropriate term.
___________ is a key protocol in the IPSec architecture for establishing security associations (SA) and cryptographic keys in an Internet environment.

A.
ISAKMP

Explanation:
ISAKMP (Internet Security Association and Key Management Protocol) is a protocol for establishing Security Associations (SA) and cryptographic keys in an Internet environment. It provides a framework for the negotiation and management of security associations between peers and traverses on UDP/500 port. ISAKMP defines the procedures for authenticating a communicating peer, creation and management of Security Associations, key generation techniques, and threat mitigation (e.g. denial of service and replay attacks). ISAKMP defines procedures and packet formats to establish, negotiate, modify, and delete Security Associations. Security Associations contain all information required for execution of various network security services, such as the IP layer services (such as header authentication and payload encapsulation), transport or application layer services, or self-protection of negotiation traffic. ISAKMP defines payloads for exchanging key generation and authentication data.