What is the role of IKE within the IPsec protocol?

A.
peer authentication and key exchange

B.
data encryption

C.
data signature

D.
enforcing quality of service

Explanation:
The main protocols that make up the IPSec suite and their basic functionality are as follows:
Authentication Header (AH) provides data integrity, data origin authentication, and protection from replay
attacks.
Encapsulating Security Payload (ESP) provides confidentiality, data-origin authentication, and data integrity.
Internet Security Association and Key Management Protocol (ISAKMP) provides a framework for security
association creation and key exchange.
Internet Key Exchange (IKE) provides authenticated keying material for use with ISAKMP
Incorrect Answers:
B: The IPsec protocol uses Encapsulating Security Payload (ESP) for encryption, not IKE.
C: The IPSec protocol uses data signatures to provide data integrity. IKE is not used for signing the data
packets.
D: The IPsec protocol does not enforce quality of service.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 705