What are the advantages of using multiarea OSPF? (Choose two.)
- A backbone area is not required.
- It allows OSPFv2 and OSPFv3 to run together.
- It enables multiple routing protocols to run in a large network.
- It improves routing efficiency by reducing the routing table and linkstate update overhead.
- It improves routing performance by dividing the neighbor table into separate smaller ones.
- Topology changes in one area do not cause SPF recalculations in other areas.
Explanation: A multiarea OSPF network improves routing performance and efficiency in a large network. As the network is divided into smaller areas, each router maintains a smaller routing table because routes between areas can be summarized. Also, fewer updated routes means fewer LSAs are exchanged, thus reducing the need for CPU resources. Running multiple routing protocols simultaneously and implementing both IPv4 and IPv6 are not primary considerations for a multiarea OSPF network. With multiarea OSPF, only routers within an area share the same linkstate database. Changes to the network topology in one area do not impact other areas, which reduces the number of SPF algorithm calculations and the number of link-state databases.
Exam with this question: 1.4.2 Module Quiz - Single-Area OSPFv2 Concepts
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