Final answer:
In EIGRP, the second best entry in the topology table is known as a Feasible Successor, which is a backup route that satisfies the feasibility condition for quick convergence.
Step-by-step explanation:
The correct term for the second best entry in the topology table in EIGRP (Enhanced Interior Gateway Routing Protocol) is a Feasible Successor. A Feasible Successor in EIGRP is a route which is not the primary (best) route to a destination but is a backup route that is loop-free and satisfies the feasibility condition.
This condition requires that the Reported Distance (RD) from a neighbor to a destination must be less than the Feasible Distance (FD) of the current best route. When the primary route (Successor) fails, the Feasible Successor can immediately take over without needing to recalculate the best path, which helps in achieving quick convergence.
EIGRP, or Enhanced Interior Gateway Routing Protocol, is a routing protocol used in computer networks to help routers exchange information and make decisions about the best paths for data to travel. In the EIGRP topology table, the second best entry is called the Feasible Successor. The Feasible Successor is a backup route that is precomputed and ready to take over if the primary route fails.