How much information do the routers in the backbone area (Area 0) have about the topology of Area 1 and Area 2?
What will be an ideal response?
The backbone area routers have interface attached to the backbone (area 0.0.0.0). The area
border routers advertise the addresses of their directly connected areas by originating summary-LSAs into the backbone. So routers in the backbone examine all summary-LSAs, use the best summary-LSA to create a routing table entry for the destination, and then readvertise the destination into its attached area in summary-LSAs of its own. For example, PC1 and PC2. Area topologies are invisible to the outside of it.
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