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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.

Both routers are configured in different areas.

An ACL is configured on the routing protocol.

The Process ID's are configured differently on each router.

A passive interface is configured on a router.

The Router-ID was not configured on each router.



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