In which situation would a company implement an OSPF NSSA?

In which situation would a company implement an OSPF NSSA?

• when external routes need to connect to an OSPF area
• when one or more non-OSPF networks connect to an OSPF stub area
• when external routes need to be suppressed throughout all of the OSPF areas
• when one or more non-OSPF networks need to connect to the OSPF backbone

Explanation: When an OSPF not-so-stubby area (NSSA) is implemented, external routes are allowed to travel through a stub area that has other external routes prohibited. The way this is accomplished is through the use of type 7 LSAs which are used to carry the external routes across the stub area, but still keep other type 5 external routes out of the area. When the type 7 LSAs reach the ABR for the stub area, the ABR changes these LSAs to type 5s for transmission through the rest of the OSPF areas that allow type 5 LSAs.

Exam with this question: CCNP ENARSI v8 Certification Practice Exam