Type 7 LSAs (NSSA External LSAs)are used inNot-So-Stubby Areas (NSSAs)to carry external routing information.
These LSAs aregenerated only by ASBRs within an NSSA, and later converted toType 5 LSAsby theABR.
Stub areas do not allow ASBRs, meaningType 7 LSAs cannot exist in a stub area.
The question incorrectly states thatType 7 LSAs can be generated in stub areas, which isfalse.
????Reference:Huawei HCIA-Datacom Study Guide, OSPF LSA Types and Area Configurations.
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