An enterprise uses an MPLS Layer 3 VPN with the company headquarters connected plus 10 remote sites connected to the service. The enterprise uses OSPF at all sites, with one router connected to the service from each site. Which of the following are true about the Layer 3 details most likely used with this service and design? (Choose two answers.)
- The WAN uses one IP subnet.
- The WAN uses 10 or more IP subnets.
- A remote site router would have one OSPF neighbor.
- A remote site router would have 10 or more OSPF neighbors.
Explanation: A Layer 3 MPLS VPN creates an IP service with a different subnet on each access link. With one headquarters router and 10 remote sites, 11 access links exist, so 11 subnets are used.
As for the OSPF neighbor relationships, each enterprise router has a neighbor relationship with the MPLS provider edge (PE) router, but not with any of the other enterprise (customer edge) routers. So each remote site router would have only one OSPF neighbor relationship.
Please login or Register to submit your answer