In an NSSA with two ABRs, what translates Type 7 LSAs to Type 5 LSAs?

In a Not-So-Stubby Area (NSSA), Type 7 LSAs are generated to allow external routing information to be injected into the area while still retaining the stub area characteristics. When Type 7 LSAs need to be translated to Type 5 LSAs for distribution to other areas, the process is managed by the Area Border Routers (ABRs) that connect the NSSA to other OSPF areas.

The correct answer is predicated on the behavior of ABRs in OSPF. Specifically, when multiple ABRs are present in an NSSA, the translation of Type 7 LSAs to Type 5 LSAs is performed by the ABR with the highest Router ID (RID). This mechanism ensures that only one ABR is responsible for the translation, preventing multiple type 5 LSAs from being created for the same external route, which could lead to inconsistencies and routing loops.

The selection of the ABR based on the highest RID helps in maintaining a stable routing environment and avoids potential conflicts that could arise if multiple ABRs attempted to translate the same Type 7 LSAs simultaneously. Understanding this aspect of OSPF operation in NSSAs is crucial as it highlights the significance of the RID and the role