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200-901 Practice Question: A network administrator is configuring OSPF on a…
A network administrator is configuring OSPF on a router and wants to ensure that routes from area 0 are propagated to area 1, but area 1 should not see specific inter-area routes. Which OSPF feature should be used?
⚠ Common exam trap
The trap is that candidates may think a stub area is sufficient when the requirement is to block inter-area routes. However, a stub area only blocks external routes (Type 5 LSAs), not inter-area routes (Type 3 LSAs). A totally stubby area blocks both, which is what the scenario calls for.
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
✓
Totally stubby area
A totally stubby area (Option B) blocks both Type 5 (external) and Type 3 (inter-area) LSAs, injecting only a default route into the area. This meets the requirement that area 1 should not see specific inter-area routes, while still allowing connectivity to area 0 via the default route. A stub area (Option D) only blocks Type 5 LSAs, not Type 3, so it would not prevent inter-area routes from being seen.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NSSA
Why it's wrong here
NSSA (Not-So-Stubby Area) allows Type 7 LSAs for external routes and does not block Type 3 inter-area routes, so it does not fulfill the requirement.
- ✓
Totally stubby area
Why this is correct
Correct. As explained, a totally stubby area blocks inter-area and external routes, providing only a default route. This matches the requirement to hide specific inter-area routes.
- ✗
Virtual-link
Why it's wrong here
A virtual-link is used to connect a non-backbone area to the backbone area 0 through another area, not to filter routes.
- ✗
Stub area
Why it's wrong here
Incorrect. A stub area only blocks external (Type 5) LSAs but still permits inter-area (Type 3) LSAs, so it would not prevent specific inter-area routes from being advertised into area 1.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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