An ABR is connected to an NSSA, which configuration disables the exporting of Type 7 LSAs into the connected NSSA?

In an OSPF (Open Shortest Path First) network, an ABR (Area Border Router) connects different OSPF areas. When an ABR connects to a Not-So-Stubby Area (NSSA), it can receive Type 7 LSAs (Link-State Advertisements) but may need to control how these LSAs are handled to maintain the proper OSPF routing environment.

The correct configuration that disables the exporting of Type 7 LSAs into the connected NSSA is known as "no-nssa-abr." This command effectively prevents the ABR from translating any Type 7 LSAs received from the NSSA into Type 5 external LSAs, which would then be flooded into other areas. By doing this, the ABR ensures that the characteristics of the NSSA are preserved and that external routing information does not inadvertently propagate into the NSSA, which could lead to routing inefficiencies or even loops.

In contrast, the other options do not specifically achieve this outcome. The "no-type7" command is not a valid OSPF command. The "NSSA" option doesn't specify a configuration command that would prevent Type 7 LSAs from being exported. The "area-range" command is used to