Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 323
An engineer configured VRF-Lite on a router for VRF blue and VRF red. OSPF must be enabled on each VRF to peer to a directly connected router in each VRF. Which configuration forms OSPF neighbors over the network 10.10.10.0/28 for VRF blue and 192.168.0.0/30 for VRF red?
Answer options
- A. router ospf 1 vrf blue network 10.10.10.0 0.0.0.252 area 0 router ospf 2 vrf red network 192.168.0.0 0.0.0.240 area 0
- B. router ospf 1 vrf blue network 10.10.10.0 0.0.0.15 area 0 router ospf 2 vrf red network 192.168.0.0 0.0.0.3 area 0
- C. router ospf 1 vrf blue network 10.10.10.0 0.0.0.240 area 0 router ospf 2 vrf red network 192.168.0.0 0.0.0.252 area 0
- D. router ospf 1 vrf blue network 10.10.10.0 0.0.0.3 area 0 router ospf 2 vrf red network 192 168.0.0 0.0.0.15 are 0
Correct answer: B
Explanation
Option B is correct because it uses the correct wildcard masks to match the specified subnets for OSPF. The mask 0.0.0.15 for the network 10.10.10.0 allows for the full /28 range, while the mask 0.0.0.3 for 192.168.0.0 covers the /30 range. The other options either use incorrect wildcard masks or contain syntax errors that would prevent OSPF from functioning properly.