FlexVPN Tunnel Configuration

D.

In a Flex VPN tunnel, the configuration construct that must be used is an IKEv2 profile.

Flex VPN is a versatile VPN solution that can be used to build a variety of VPN topologies, including point-to-point, hub-and-spoke, and fully-meshed VPN networks. It is based on the Internet Key Exchange version 2 (IKEv2) protocol, which provides strong security and flexibility.

IKEv2 is a protocol used to establish a secure connection between two devices. In Flex VPN, IKEv2 is used to establish a secure tunnel between the VPN endpoints. An IKEv2 profile is a configuration construct that defines the parameters of the IKEv2 exchange.

The IKEv2 profile specifies the following parameters:

• Authentication method: The method used to authenticate the VPN endpoints, such as digital certificates or pre-shared keys.
• Encryption algorithm: The algorithm used to encrypt the data transmitted over the VPN tunnel.
• Hash algorithm: The algorithm used to ensure data integrity.
• Diffie-Hellman group: The algorithm used to generate the shared secret used for key exchange.
• Lifetime: The duration for which the security association is valid.

An IKEv2 profile can be used to configure both the initiator and the responder of the VPN tunnel. It can also be used to configure different VPN topologies, such as point-to-point, hub-and-spoke, and fully-meshed VPN networks.

Therefore, the correct answer to the question is D. IKEv2 profile. Multipoint GRE tunnel interface is a feature that can be used to create a virtual interface for multiple GRE tunnels, but it is not a required configuration construct in Flex VPN. EAP configuration and IKEv1 policy are not relevant to Flex VPN, as they are associated with different VPN protocols (EAP is associated with L2TP/IPSec and IKEv1 is associated with IPsec VPNs).