In which scenario can we see the DOWN state of ospf neighbor ?

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A neighbor that is discovered dynamically through reception of HELLO packets can fall back to a down state if it is being deleted, for example when OSPF does not receive HELLO packets from the neighbor for period of time longer than the Dead timer interval. 

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If you dont have route in routing table, you can say when you interface is shutdown the neighbor will see down state.

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Area mismatch, authentication mismatch, hello and Dead intervals mismatch

 

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