On an OSPF network, if the network type is NBMA , a router unicasts all protocol packets; if the network type is broadcast , a router multicasts all protocol packets.
OSPF network types affect how protocol packets (Hello, LSA updates) are transmitted:
NBMA (Non-Broadcast Multi-Access) networks (e.g., Frame Relay) do not support multicast , so routers must unicast OSPF packets to neighbors.
Broadcast networks (e.g., Ethernet) support multicast and use 224.0.0.5 for Hello packets and 224.0.0.6 for DR/BDR communication .
The statement is false because:
NBMA does not unicast all packets —only Hello packets must be manually configured to be unicast.
LSAs and routing updates can still be multicast if an NBMA network is configured as point-to-multipoint .
???? Reference: Huawei HCIA-Datacom Study Guide, OSPF Network Types and Packet Transmission.
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