C. Multicast.
OSPF uses multicast addresses to communicate routing updates. It sends its updates using the multicast address 224.0.0.5, which is used for all OSPF routers, and the multicast address 224.0.0.6, used for all OSPF designated routers. This method is efficient in terms of network bandwidth, as it allows OSPF routers to receive updates without the need for sending individual updates to each router (unicast) or broadcasting to all devices in the network (broadcast).
C. Multicast
OSPF (Open Shortest Path First) uses multicast to communicate routing updates. Specifically, OSPF routers use multicast addresses to send OSPF routing information updates to other routers in the OSPF area. The OSPF routers form adjacencies and exchange routing information using OSPF multicast addresses. This multicast communication helps in efficiently distributing routing information in OSPF networks.
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