Which OSPF LSA type is generated by an ASBR to advertise external routes within an NSSA area?
- Type 3
- Type 4
- Type 5
- Type 7
Explanation: According to the sources, an OSPF Not-So-Stubby Area (NSSA) is a special area type designed to allow the injection of external routes while maintaining stub-like properties. When redistribution is performed within an NSSA, the ASBR generates a specific Link-State Advertisement known as a Type 7 External LSA, which exists only within that area. To propagate these routes to the rest of the OSPF domain, an ABR must translate the Type 7 LSAs into standard Type 5 LSAs.
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