On the Cisco IOS XR router, you have noticed lately that OSPF adjacency on one interface is
flapping occasionally; three flaps in the last 5 hours. The log in each of the three flap cases has an
error message showing that the OSPF state changed from EXCHANGE to DOWN with the
description “Neighbor Down: dead timer expired.” What is the most likely cause for this problem?

A.
The CPU on the adjacent router is pegged at 100%.

B.
The RP CPU on the Cisco IOS XR router is pegged at 100%.

C.
The adjacent router is sending corrupted OSPF packets.

D.
There is a routing loop between the Cisco IOS XR router and the adjacent router.

E.
The link between the Cisco IOS XR and the adjacent router is severely degraded.