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300-410 Practice Question: Consider this OSPF configuration on router R6:…
Consider this OSPF configuration on router R6:
router ospf 1 network 10.0.0.0 0.255.255.255 area 0 area 0 stub
What is the effect of the area 0 stub command?
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
✓
The configuration is rejected by IOS because the backbone area cannot be a stub.
The area 0 stub command is invalid because area 0 (the backbone) cannot be configured as a stub area. Stub areas are used to reduce LSA flooding, but the backbone must have full routing information. This configuration will be rejected by IOS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Area 0 will become a stub area, blocking type 5 LSAs from entering the backbone.
Why it's wrong here
Incorrect. Area 0 cannot be a stub area.
- ✓
The configuration is rejected by IOS because the backbone area cannot be a stub.
Why this is correct
Correct. RFC 2328 prohibits the backbone from being a stub.
- ✗
The command is ignored, and area 0 remains a normal area.
Why it's wrong here
Incorrect. The command is rejected, not ignored.
- ✗
Only type 5 LSAs are blocked, but type 3 and 4 LSAs are still allowed.
Why it's wrong here
Incorrect. The command is invalid.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.