You are working as a Tier 3 NOC engineer at a large service provider. Supporting the core
network is part of your job responsibility. An escalation has come to you after Tier 2 determines
that a problem lies within the core of the network and is affecting every customer. You have

analyzed the information in the trouble ticket, performed your own troubleshooting, and have
determined that a BGP session is flapping between two core routers. Which two steps should you
take before escalating to the router vendor? (Choose two.)

A.
Verify that the routers are sending keepalives.

B.
Determine if there is a Layer 2 or 3 transport problem.

C.
Enable path MTU discovery.

D.
Restart the BGP router process.