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OSPF routers "R1" and "R2" are not forming an adjacency. Which of the following could cause the problem? (choose three)
Each router has different costs in the directly connected link.
A passive interface is configured on a router.
Both routers are configured in different areas.
An ACL is configured on the routing protocol.
The Router-ID was not configured on each router.
The Process ID's are configured differently on each router.
For two routers to form an OSPF adjacency, they must be in the same area, must be in the same subnet, and must have the same authentication (if configured). If an ACL or a passive interface is set, it might avoid OSPF updates to be transmitted or received.
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