Which WAN topology has the highest degree of reliability?

In a full mesh topology, each device has a direct connection to every other device in the network, meaning if one path fails, there are many alternative paths available, ensuring maximum redundancy and fault tolerance. This design eliminates single points of failure between nodes.

Point-to-point connections only connect two nodes, offering no redundancy if that single link fails.

A hub-and-spoke topology has a central point of failure; if the hub fails, all spokes lose connectivity to each other.

Router-on-a-stick describes a configuration for VLAN routing, not a WAN topology, and it inherently has a single point of failure (the router's interface).