Refer to the exhibit.

AS65000 has core network P1 – P6. The eBGP peers to another AS are through ASBR1-2 and
ASBR3-4. All business and residential customer POPs are connected to the P1 – P2 core.

AS65000 has decided to enable MPLS LDP on all BGP routers, and disable BGP on the core
network (P1 – P6). What is the drawback of this BGP core-free network?

A.
MPLS LDP is slower compared to BGP.

B.
All IP addresses of nodes and links within AS65000 are exposed to any external AS.

C.
The BGP configuration must be full-mesh between the ASBR and PE routers.

D.
The core router will not be involved in the BGP path selection process.

Explanation:
Although removing the core routers so that they are not burdened with running BGP is a goal of
many service providers, one drawback is that they are then no longer participating in the BGP path
selection process.