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A "database" is a collection of information, often organized in tables. OSPF routers - i.e., routers that implement the OSPF routing protocols - need to maintain several databases, for example, a neighbor database (a list of connected neighbors), and a link-state database (a list of all the connections between different routers in the same area, which the router has learned about).

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Q: What are OSPF Databases?
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