350-501 Networking Practice Question
In OSPF, which type of area does not allow external routes and only accepts a default route?
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 injects a default route; it does not accept external routes from other areas.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Backbone area
Why it's wrong here
Area 0 is the backbone and carries all LSA types.
- ✓
Stub area
Why this is correct
Stub areas block Type 5 LSAs and use a default route.
- ✗
NSSA
Why it's wrong here
NSSA allows import of external routes as Type 7 LSAs.
- ✗
Totally stubby
Why it's wrong here
Totally stubby blocks Type 3, 4, and 5 LSAs, and uses a default route.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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