350-501 Networking Practice Question
Which OSPF area type does not allow external routes (Type 5 LSAs) but does allow inter-area routes and can have a default route injected?
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
✓
Stub area
A stub area blocks Type 5 LSAs, and a default route is injected for external destinations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Totally stubby area
Why it's wrong here
Totally stubby blocks Type 3, 4, 5.
- ✗
Backbone area (Area 0)
Why it's wrong here
Area 0 allows all LSAs.
- ✗
Not-So-Stubby Area (NSSA)
Why it's wrong here
NSSA allows Type 7 LSAs.
- ✓
Stub area
Why this is correct
Stub areas block Type 5 and have a default.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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