Can an OSPF neighbor relationship be established between devices that are on different subnets

A neighbor relationship can be established between two routers that are not on the same subnet only when the devices are connected through point-to-point (P2P) links.

On a Point-to-Multipoint (P2MP) network, you can determine whether adjacencies can be formed between neighbors that are not on the same subnet.

In all other cases, the devices must be on the same subnet.

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