OSPF inter-area route summarization reduces the routing information exchanged between areas and the size of routing tables, and improves routing performance. OSPF inter-area route summarization enables an ABR to summarize contiguous networks into a single network and advertise the network to other areas.
B & C is the correct answer
benefits of route summarization in ospf
Saves memory: routing tables will be smaller which reduces memory requirements.
Saves bandwidth: there are less routes to advertise so we save some bandwidth.
Saves CPU cycles: less packets to process and smaller routing tables to work on.
Stability: Prevents routing table instability due to flapping networks.
so on
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