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300-410 Practice Question: Which OSPF LSA type is used to advertise prefixes…
Which OSPF LSA type is used to advertise prefixes from other areas into the backbone area?
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
✓
Type 3 (Summary LSA)
Type 3 LSAs (Summary LSAs) are generated by Area Border Routers (ABRs) to advertise networks from one area to another. They are used to propagate inter-area routes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Type 1 (Router LSA)
Why it's wrong here
Incorrect. Type 1 LSAs describe a router's own links within an area.
- ✗
Type 2 (Network LSA)
Why it's wrong here
Incorrect. Type 2 LSAs are generated by the DR on multi-access networks.
- ✓
Type 3 (Summary LSA)
Why this is correct
Correct. Type 3 LSAs are used for inter-area route advertisement.
- ✗
Type 5 (External LSA)
Why it's wrong here
Incorrect. Type 5 LSAs are used for external routes redistributed into OSPF.
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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JA
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.