If the primary path goes down, what will EIGRP use to reach a destination?
A.
administrative distance
B.
advertised successor
C.
successor
D.
feasible successor
Explanation:
The key to this question is the four terminology about DUAL.Enhanced Interior Gateway Routing Protocol (EIGRP) is an enhanced distance-vector protocol
based on the diffusing update algorithm (DUAL). It is capable of (conservatively) finding all loopfree paths to any given destination based on route advertisements from neighbors. The neighbor
(or neighbors) with the best path to a destination is called the successor. The remaining neighbors
with loop-free paths to the destination are called feasible successors. To reduce traffic load on the
network, EIGRP maintains neighbor relationships and exchanges routing information only as
needed, using a query process to find alternate paths when all loop-free paths to a destination
have failed.