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OSPF is configured on the router but the OSPF neighbor list is shows no entry. Which of the following is not a possible cause for this problem?
There is an authentication mismatch.
OSPF is not enabled on the interface.
There is a Process ID mismatch.
The area has been configured differently.
The interface is passive under OSPF.
To enable OSPF on an interface the command "network" must include the interfaces IP address. OSPF adjacencies only form if the following hello fields match: 1) Area ID, 2) Hello and dead timers, 3) Authentication and 4)Stub ID. The Process ID is a local value and can be defined on the router locally.
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