ABRs advertise link state information about non-backbone areas into backbone areas. The backbone area then advertises the routing information into other non-backbone areas. Link state information about the backbone area cannot be advertised into non-backbone areas.

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Quizplus · Accepted Answer

Link state information about the backbone area can be advertised into non-backbone areas. This is a fundamental aspect of OSPF (Open Shortest Path First) where Area Border Routers (ABRs) distribute routing information between backbone and non-backbone areas.

ABRs Advertise Link State Information About Non-Backbone Areas into Backbone