Quick area type overview

Unless specified otherwise, all OSPF area starts out as a standard area. Of course, area 0 is always the backbone and needs the correct details. This means that the type of area 0 is always normal. A normal network will always reatin all information. The information just gets aggregated at area borders1)This assumes you aren’t doing any manual summarisation..
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1. This assumes you aren’t doing any manual summarisation.