An engineer connects routers R13 and R14 to the same Ethernet LAN and configures them to use OSPFv2. Which answers describe a combination of settings that would prevent the two routers from becoming OSPF neighbors?
- Both routers’ interface IP addresses reside in the same subnet.
- Both routers’ OSPF process uses process ID 13.
- Both routers’ OSPF process uses router ID 13.13.13.13.
- Both routers’ interfaces use an OSPF Dead interval of 40.
Explanation: As worded, the correct answers should be a scenario that would prevent the neighbor relationship. The answers all list values that are identical or similar on the two routers. Of those, the use of an identical OSPF router ID (RID) on the two routers prevents them from becoming neighbors, making that one answer correct.
Of the incorrect answers, both routers must have the same Dead interval, so both using a Dead interval of 40 causes no issues. The two routers can use any OSPF process ID (the same or different value, it does not matter), making that answer incorrect.
Finally, the two routers’ IP addresses must be in the same subnet, so again that scenario does not prevent R13 and R14 from becoming neighbors.
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