Which of the following protocols would MOST likely be used in the establishment of an IPSec VPN tunnel?

ISAKMP (Internet Security Association and Key Management Protocol) is a protocol defined by RFC 2408 for establishing Security Associations (SA) and cryptographic keys in an Internet environment. ISAKMP only provides a framework for authentication and key exchange and is designed to be key exchange independent

Temporal Key Integrity Protocol or TKIP /tiːˈkɪp/ was a stopgap security protocol used in the IEEE 802.11 wireless networking standard.

IEEE 802.1Q is the networking standard that supports virtual LANs (VLANs) on an Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames. The standard also contains provisions for a quality of service prioritization scheme commonly known as IEEE 802.1p and defines the Generic
Attribute Registration Protocol.

The Advanced Encryption Standard (AES) is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001.
AES is based on the Rijndael cipher

D. Correct answer.