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The DR is a function of a broadcast or NBMA (Non Broadcast Multiple Access) network which operates the OSPF (Open Shortest Path First) routing protocol. The DR has two functions, namely:
§ Generation and transmission of Network LSA (Link State Advertisement) for the entire network, thus reducing the amount of routing traffic.
§ Synchronization with all other routers on the network in order to ensure routing information is current and valid.
