The ABR of an NSSA will not advertise Type-4 and Type-5 LSAs to an NSSA but can import external routes into the NSSA.

Name: The ABR of an NSSA will not advertise Type-4 and Type-5 LSAs to an NSSA but can import external routes into the NSSA.
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An ABR of an NSSA (Not-So-Stubby Area) does not advertise Type-4 and Type-5 LSAs into the NSSA, but it can import external routes into the NSSA using Type-7 LSAs, which are then translated to Type-5 LSAs by the ABR for other areas.

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