Question 282 of 1,420
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350-401 Practice Question: Which three statements about OSPF route…
Which three statements about OSPF route summarization are true? (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
✓
Inter-area route summarization is configured on ABRs using the "area range" command.
Inter-area summarization is configured on ABRs to reduce the number of Type 3 LSAs. Option B is correct because external route summarization is configured on ASBRs to reduce Type 5 LSAs. Option C is correct because summarization helps reduce the routing table size and LSA flooding, improving network stability. Option D is incorrect because summarization is not supported on internal routers; it is only performed on ABRs and ASBRs. Option E is incorrect because summarization does not affect Type 1 or Type 2 LSAs; it only affects Type 3 and Type 5 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.
- ✓
Inter-area route summarization is configured on ABRs using the "area range" command.
Why this is correct
Correct because ABRs use the "area range" command to summarize routes between areas, reducing Type 3 LSAs.
- ✓
External route summarization is configured on ASBRs using the "summary-address" command.
Why this is correct
Correct because ASBRs use the "summary-address" command to summarize redistributed external routes, reducing Type 5 LSAs.
- ✓
Route summarization reduces the size of the LSDB and improves network convergence.
Why this is correct
Correct because summarization reduces the number of LSAs, which in turn reduces LSDB size and speeds up convergence.
- ✗
Route summarization can be configured on any OSPF router to reduce Type 1 LSAs.
Why it's wrong here
Incorrect because summarization is only performed on ABRs or ASBRs; internal routers cannot summarize routes.
- ✗
Summarization in OSPF can be applied to Type 1 and Type 2 LSAs to reduce flooding.
Why it's wrong here
Incorrect because summarization only applies to Type 3 (inter-area) and Type 5 (external) LSAs, not to Type 1 or Type 2.
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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