Which technology must be used to implement secure VPN connectivity among company branches over a private IP cloud with any-to-any scalable connectivity?

DMVPN (Dynamic Multipoint VPN) is excellent for hub-and-spoke and partial mesh deployments, but GET VPN is typically preferred for large-scale, full-mesh branch-to-branch communication over a private IP cloud due to its simpler routing and group keying.

FlexVPN is a unified framework for various VPN scenarios using IKEv2, offering flexibility but not specifically designed as a native any-to-any architecture over a private IP cloud in the same way GET VPN is.

IPsec DVTI (Dynamic Virtual Tunnel Interface) is a feature used within other VPN solutions like DMVPN or FlexVPN to simplify dynamic tunnel creation, but it is not a complete end-to-end technology for scalable any-to-any connectivity over a private IP cloud by itself.

Group Encrypted Transport VPN (GET VPN) is specifically designed to provide highly scalable and secure any-to-any VPN connectivity over a private IP cloud, allowing all members of a security group to communicate securely without requiring traditional point-to-point tunnels between every pair of sites, which simplifies routing and management for full-mesh topologies.