The ABR of an NSSA does not advertise Type-4 and Type-5 LSAs to an NSSA instead it imports external routes into the NSSA,

Name: The ABR of an NSSA does not advertise Type-4 and Type-5 LSAs to an NSSA instead it imports external routes into the NSSA,
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In an NSSA (Not-So-Stubby Area), the ABR (Area Border Router) does not advertise Type-4 and Type-5 LSAs into the NSSA. Instead, it uses Type-7 LSAs to import external routes into the NSSA, which are then translated to Type-5 LSAs when they leave the NSSA.

The ABR of an NSSA Does Not Advertise Type-4 and Type-5