What is a key characteristic of a full mesh VPN topology?

A full mesh VPN topology is characterized by the ability of all peers to communicate directly with each other. In a full mesh configuration, every network node is interconnected, allowing for multiple pathways for data to travel between any two points in the network. This direct communication enhances redundancy and reliability, as the failure of one connection does not disrupt the overall network connectivity, since alternate paths can be utilized.

In contrast, the other choices do not accurately represent the defining attributes of a full mesh topology. For instance, a single point of connection or limiting communication to a central server describes more centralized or hub-and-spoke topologies, which do not provide the direct intercommunication feature found in a full mesh setup. Lastly, stating that it's the simplest form of VPN topology misrepresents its complexity in terms of management and configuration compared to other topologies, such as star or hub-and-spoke arrangements.