350-501 Networking Practice Question
Which OSPF area type is most suitable for a service provider's customer-facing network where external routes are blocked, but internal routes (including inter-area) are allowed, and the area should not accept Type 5 LSAs?
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 but allows inter-area and intra-area routes. It injects a default route. NSSA allows limited external routes via Type 7, which is not desired here.
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 allows Type 7 LSAs for limited external routes.
- ✗
Backbone area
Why it's wrong here
Backbone area (Area 0) allows all LSAs.
- ✗
Totally stubby area
Why it's wrong here
Totally stubby blocks both Type 3,4,5, which would block inter-area routes.
- ✓
Stub area
Why this is correct
Stub area blocks Type 5 LSAs and uses default route.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.