350-501 Networking Practice Question
In an OSPF network, an area is configured as a Not-So-Stubby Area (NSSA). Which statement about LSA types in this area is correct?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Type 7 LSAs are originated by ASBR within the NSSA and converted to Type 5 by the ABR.
NSSA areas allow Type 7 LSAs to carry external routes, which are translated to Type 5 at the ABR. Type 5 LSAs are not allowed within the NSSA, and Type 4 LSAs are also blocked. Type 3 LSAs (summary) are allowed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Type 1 and Type 2 LSAs are not allowed in NSSA.
Why it's wrong here
Type 1 and 2 are always present in any area.
- ✗
Type 4 LSAs are used to advertise the ABR to other areas.
Why it's wrong here
Type 4 LSAs are not needed in NSSA because Type 5 are blocked.
- ✓
Type 7 LSAs are originated by ASBR within the NSSA and converted to Type 5 by the ABR.
Why this is correct
Correct. Type 7 LSAs originated in NSSA and translated at ABR to Type 5 for other areas.
- ✗
Type 5 LSAs are flooded within the NSSA.
Why it's wrong here
Type 5 LSAs are blocked in NSSA; Type 7 is used instead.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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