Which of the following correctly describes an EIGRP Successor?

The concept of an EIGRP Successor refers specifically to the primary route used to reach a destination network within the Enhanced Interior Gateway Routing Protocol (EIGRP). The Successor is determined by the metric calculated for the route, which takes into account various factors such as bandwidth, delay, load, and reliability.

When EIGRP selects a Successor, it chooses the route that has the lowest feasible distance (FD). The feasible distance is the best metric to reach a destination, and therefore, the Successor represents the most efficient path. This is critical for ensuring maximum performance and reliability in network routing.

In this context, other options describe different aspects of EIGRP routing but do not accurately define the Successor. For instance, the second-best path or alternative route concepts are related to feasible successors, which are backup routes, but they are not the primary choice. Similarly, the best path with a higher metric would not qualify as a Successor, as it would not represent the most efficient route. Understanding these distinctions is key to mastering EIGRP's routing mechanisms and effectively managing network pathways.