VRF-Lite: which OSPF commands create neighbors on 10.10.10.0/28 for vrf blue and 192.168.0.0/30 for vrf red?
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Correct answer: 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.
Why this is the answer
The correct answer uses the appropriate wildcard masks for each subnet. For the vrf blue network 10.10.10.0/28, the wildcard mask is 0.0.0.15. A /28 subnet has 16 addresses (2^4), so the wildcard mask is 255.255.255.255 - 255.255.255.240 = 0.0.0.15. For the vrf red network 192.168.0.0/30, the wildcard mask is 0.0.0.3. A /30 subnet has 4 addresses (2^2), so the wildcard mask is 255.255.255.255 - 255.255.255.252 = 0.0.0.3. The other options use incorrect wildcard masks, which would either include too many or too few addresses for the specified subnets, preventing OSPF from forming neighbors correctly on those interfaces.
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