350-501 Networking Practice Question
A service provider is designing an OSPF network with multiple areas. Which TWO area types allow external routes (Type 5 LSAs) to be injected into the area? (Choose two.)
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
✓
Standard area
Standard areas and the backbone area (Area 0) allow Type 5 LSAs. Stub, totally stubby, and NSSA do not accept Type 5 LSAs (NSSA converts Type 7 to Type 5 at ABR, but internally uses Type 7).
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 uses Type 7 for external routes, not Type 5.
- ✓
Standard area
Why this is correct
Standard area (non-stub) accepts Type 5 LSAs.
- ✗
Stub area
Why it's wrong here
Stub area blocks Type 5 LSAs.
- ✓
Backbone area (Area 0)
Why this is correct
Backbone area accepts all LSAs including Type 5.
- ✗
Totally stubby area
Why it's wrong here
Totally stubby blocks Type 3,4,5.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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