Question

Which type of EIGRP route entry describes a feasible successor?

A.	a backup route, stored in the routing table
B.	a primary route, stored in the routing table
C.	a backup route, stored in the topology table
D.	a primary route, stored in the topology table

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Accepted Answer

a backup route, stored in the topology table

Accepted Answer

Feasible Successors:

A destination entry is moved from the topology table to the routing table when there is a feasible successor. All minimum cost paths to the destination form a set. From this set, the neighbors that have an advertised metric less than the current routing table metric are considered feasible successors.

Feasible successors are viewed by a router as neighbors that are downstream with respect to the destination. These neighbors and the associated metrics are placed in the forwarding table.

When a neighbor changes the metric it has been advertising or a topology change occurs in the network, the set of feasible successors may have to be re-evaluated. However, this is not categorized as a route recomputation.