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Within a network segment where a router may have several neighbors, such as an Ethernet network, the OSPF routers elect a designated router (DR). Due to the importance of the DR, a backup DR (BDR) is also elected. The DR will centralize communications - all other routers in that segment will only have a full adjacency with the DR and the BDR - and partial adjacencies with all other routers in the segment.

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Q: What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present?
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