When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, the service provider MPLS backbone looks like what to the CE routers?

When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, the service provider MPLS backbone looks like what to the CE routers?
A . the backbone (Area 0)
B . an external routing domain
C . a superbackbone that is transparent to the CE OSPF routers
D . a transit area (similar to a transit area for supporting virtual links)

View Answer

Answer: C