You are redesigning an OSPF v2 network and must migrate some links. You are concerned that there are different subnet masks. Which two link types will still form an OSPF adjacency even if there are su

Virtual links in OSPF are treated internally as unnumbered point-to-point connections, and the subnet mask field in hello packets is not validated during adjacency setup. This allows virtual link neighbors to form adjacency regardless of subnet mask differences.

Broadcast OSPF links require subnet mask agreement in hello packets, and a mismatch causes the neighbor relationship to fail.

Point-to-multipoint links do perform subnet mask validation during OSPF neighbor formation, so mismatched masks prevent adjacency.

Non-broadcast (NBMA) OSPF link types include and verify the subnet mask in hello packets, preventing adjacency when masks do not match.

On point-to-point OSPF link types, the subnet mask transmitted in hello packets is not checked against the receiving router's configured mask, so a mismatch does not prevent adjacency. This behavior supports unnumbered links and other configurations where addresses may not share a common prefix.