Choose two: Which statements correctly describe NSSA behavior?
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Correct answer: An ASBR inside an NSSA injects redistributed external routes as Type-7 LSAs, An ABR converts Type-7 LSAs into Type-5 LSAs for flooding into non-NSSA areas.
Why this is the answer
An ASBR within an NSSA (Not-So-Stubby Area) injects external routes learned via redistribution as Type-7 LSAs. This allows external routes to be advertised within the NSSA without violating the stub area rule of not allowing Type-5 LSAs. An ABR connected to an NSSA then converts these Type-7 LSAs into Type-5 LSAs before flooding them into other standard OSPF areas. This conversion is necessary because Type-7 LSAs are only understood within an NSSA. Type-5 LSAs are not flooded into an NSSA by default; this is the primary characteristic of a stub area, including NSSAs, to reduce the routing table size. NSSAs do not suppress Type-3 inter-area summary LSAs; these are essential for reachability to other OSPF areas.
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