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300-410 Practice Question: Which TWO statements about OSPFv2 LSA types and…
Which TWO statements about OSPFv2 LSA types and their troubleshooting significance are true? (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
✓
Type 5 LSAs are flooded throughout all OSPF areas, including the backbone area.
Type 5 LSAs are always flooded throughout the entire OSPF domain, and type 7 LSAs are used in NSSA areas to carry external routes. Type 3 LSAs are summary LSAs, not stub network LSAs. Type 4 LSAs advertise ASBR reachability, not external routes. Type 1 LSAs are router LSAs, not summary LSAs.
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 5 LSAs are flooded throughout all OSPF areas, including the backbone area.
Why this is correct
Correct. Type 5 (AS-External) LSAs are flooded across the entire OSPF domain, except stub areas and NSSAs (unless translated).
- ✓
Type 7 LSAs are used in NSSA areas to advertise external routes and are translated to Type 5 LSAs at the ABR.
Why this is correct
Correct. Type 7 LSAs are NSSA external LSAs, used to carry external routes within NSSA areas, and are translated to Type 5 by the ABR.
- ✗
Type 3 LSAs describe stub network prefixes within an area and are generated by DRs.
Why it's wrong here
Incorrect. Type 3 LSAs are summary LSAs generated by ABRs to advertise routes between areas, not stub networks.
- ✗
Type 4 LSAs are used to advertise external routes into the OSPF domain by ASBRs.
Why it's wrong here
Incorrect. Type 4 LSAs are ASBR summary LSAs, generated by ABRs to advertise the location of an ASBR, not external routes.
- ✗
Type 1 LSAs are summary LSAs that describe inter-area routes.
Why it's wrong here
Incorrect. Type 1 LSAs are router LSAs, describing the router's directly attached links and their state.
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
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