What condition must a route meet to be considered a feasible successor in EIGRP?

In EIGRP (Enhanced Interior Gateway Routing Protocol), a route is considered a feasible successor if its reported distance is lower than the feasible distance of the current best route. The feasible distance is the lowest calculated distance to reach a destination, while the reported distance is the metric for a neighboring router's route to that same destination.

This is a key aspect of EIGRP's efficient routing capabilities, allowing it to have backup routes readily available for quick switching if the primary route fails. By ensuring that a potential successor's reported distance is lower than the best feasible distance, EIGRP guarantees that the route can be used to provide an alternate path when needed.

Other options do not accurately reflect the criteria for determining a feasible successor. For example, having a higher reported distance or matching the feasible distance would not qualify the route as a viable alternative. These conditions would not ensure that the alternative route is actually more efficient than the current best route.