H12-821_V1.0 Exam Dumps | On an OSPF network, if the network type is NBMA, a router unicasts all protocol packets; if the network

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Question 67/140

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.

A. TRUE

B. FALSE

Correct Answer: B

Comprehensive and Detailed In-Depth Explanation:
* 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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