Does the IPSec protocol suite use IKE or ISAKMP?
RFC 2828 states ISAKMP is the protocol used in IPSec to handle SAs, key management and system authentication. Other sources say IKE is the protocol that used.
From RFC 2828:
$ Internet Security Association and Key Management Protocol (ISAKMP)
(I) An Internet IPsec protocol [R2408] to negotiate, establish, modify, and delete security associations, and to exchange key generation and authentication data, independent of the details of any specific key generation technique, key establishment protocol,encryption algorithm, or authentication mechanism.