What is an advantage of a hub and spoke IPsec VPN configuration over a fully-meshed configuration?

A hub and spoke IPsec VPN configuration is advantageous primarily because it requires fewer tunnels compared to a fully-meshed configuration. In a hub and spoke setup, all remote sites (the spokes) connect to a central site (the hub). This means that each spoke only needs to establish a tunnel to the hub rather than to every other spoke.

In a fully meshed configuration, every site must be directly connected to each other, creating a significant number of tunnels. The number of tunnels in a fully-meshed network grows exponentially as additional sites are added, leading to increased management complexity and resource consumption. In contrast, the hub and spoke model streamlines the number of connections, facilitating easier management, reduced overhead, and lower likelihood of errors, making it a more scalable solution for connecting multiple remote locations.