Final answer:
The second-best entry in the EIGRP topology table is the c)Feasible Successor, which is a backup route meeting specific criteria to ensure a loop-free alternate path in case the primary route fails.
Step-by-step explanation:
In EIGRP, the second-best entry in the topology table is known as the c)Feasible Successor.
This term refers to an alternate route that is considered loop-free and is eligible for quick installation in the routing table if the primary route, called the Successor, fails. It is important to understand that for a route to be considered a Feasible Successor, it must satisfy the Feasibility Condition, which ensures that its reported distance is less than the feasible distance of the current best route.
To further clarify, the topology table in EIGRP holds information about routes to all destinations learned from neighboring routers. Each route within this table is tagged with specific metrics used to determine the best path which is installed in the routing table. The Feasible Successor is essentially a backup plan, providing redundancy that enhances the stability and resiliency of the network.