Which statements are true about EIGRP successor routes? (Choose two.)
A.
A successor route is used by EIGRP to forward traffic to a destination.
B.
Successor routes are saved in the topology table to be used if the primary route fails.
C.
Successor routes are flagged as ‘active’ in the routing table.
D.
A successor route may be backed up by a feasible successor route.
E.
Successor routes are stored in the neighbor table following the discovery process.
Explanation:
Introduction to EIGRP
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml
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.