Which of the following is NOT a component of IPSec?

A. Authentication Header

B. Encapsulating Security Payload

C. Key Distribution Center

D. Internet Key Exchange

AH, ESP and IKE are the three main components of IPSec. A KDC (Key Distribution Center) is a component of Kerberos, not IPSec.

Source: Information Systems Audit and Control Association, Certified Information Systems Auditor 2002 review manual, Chapter 4: Protection of Information Assets (page 217).