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350-401 Practice Question: Which three statements about OSPF LSA types are…
Which three statements about OSPF LSA types are correct? (Choose three.)
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 1 LSAs (Router LSAs) are generated by every OSPF router and describe the router's interfaces and neighbors within an area.
OSPF uses various LSA types to describe different routing information. Type 1 (Router LSA) is generated by every router. Type 2 (Network LSA) is generated by the DR. Type 3 (Summary LSA) is generated by ABRs. Type 4 (ASBR Summary LSA) is also generated by ABRs. Type 5 (AS External LSA) originates from ASBRs and is flooded throughout the entire OSPF domain.
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 LSAs (Router LSAs) are generated by every OSPF router and describe the router's interfaces and neighbors within an area.
Why this is correct
Correct because Router LSAs are the fundamental LSA type, created by each router to advertise its directly connected links and state.
- ✓
Type 2 LSAs (Network LSAs) are generated by the DR on broadcast and NBMA networks to list all routers attached to the segment.
Why this is correct
Correct because the DR generates Network LSAs to describe the set of routers connected to the multiaccess network.
- ✗
Type 3 LSAs (Summary LSAs) are generated by ASBRs to advertise external routes into the OSPF domain.
Why it's wrong here
Incorrect because Type 3 LSAs are generated by ABRs to advertise routes between areas, not by ASBRs. ASBRs generate Type 5 LSAs for external routes.
- ✓
Type 4 LSAs (ASBR Summary LSAs) are generated by ABRs to advertise the location of an ASBR to routers in other areas.
Why this is correct
Correct because Type 4 LSAs are used to propagate reachability information about an ASBR across area boundaries.
- ✗
Type 5 LSAs (AS External LSAs) are flooded only within the area where they originate.
Why it's wrong here
Incorrect because Type 5 LSAs are flooded throughout the entire OSPF domain (except stub areas) and are not limited to a single area.
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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Last reviewed: Jun 18, 2026
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