Standard area - every router knows every prefix
Stub area - does not accept type 5 external summary routes, default is provided by ABR
Totally stubby area - does not accept type 3,4,5 summary routes, default is provided by ABR
Not So Stubby area (NSSA) - stubby areas that can have an ASBR, type 5 LSA are disguised by type 7 LSA and converted to type 5 on ABR
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