What feature allows for automatic backup of VPN connections when connections fail?

The correct choice, which is multi-WAN failover configuration, is designed to enhance the reliability of VPN connections by allowing automatic failover to backup connections when the primary connections are disrupted. This feature is crucial in maintaining consistent connectivity and performance, ensuring that traffic can seamlessly reroute through alternative WAN links without significant downtime.

Multi-WAN failover works by monitoring the health of the primary connections and automatically switching to backup connections when issues are detected, thus supporting business continuity and enhancing the robustness of a network's architecture.

In contrast, while SD-WAN and load balancing may improve performance and distribution of traffic across available connections, they do not specifically target automatic backup functionality for individual VPN connections. Similarly, VPN tunnel aggregation refers to the combination of multiple VPN tunnels for increased bandwidth or redundancy, but it does not inherently provide the failover capability that is characteristic of multi-WAN failover configuration.