- A
The 'show ip route' command displays the summary route with a next-hop of Null0 for EIGRP and OSPF summarization.
Why wrong: Option A is incorrect. The 'show ip route' command displays a Null0 summary route only for EIGRP summarization, not for OSPF. OSPF summarization uses 'area range' and generates Type 3 LSAs instead.
- B
The 'show ip eigrp topology' command displays all configured summary addresses and their metrics.
Why wrong: Option B is incorrect. The 'show ip eigrp topology' command shows EIGRP topology entries, not configured summary addresses. Use 'show ip protocols' to see summary addresses.
- C
The 'show ip protocols' command lists the configured summary-address ranges under each routing process.
Option C is correct. The 'show ip protocols' command lists configured summary-address ranges under each routing process, making it a direct verification method.
- D
The 'debug ip routing' command provides detailed information about summary route creation and suppression.
Why wrong: Option D is incorrect. The 'debug ip routing' command shows routing table updates but does not provide specific details about summary route creation or suppression.
- E
The 'show ip ospf database summary' command displays the Type 3 LSAs, including those generated by the 'area range' command.
Option E is correct. The 'show ip ospf database summary' command displays Type 3 LSAs, including those generated by the 'area range' command, verifying OSPF summarization.
Verify Route Summarization — Cisco IOS Commands for OSPF, EIGRP, BGP | Cisco CCNP ENARSI 300-410 Explained
This 300-410 practice question tests your understanding of route summarization. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. A key principle to apply: show ip protocols. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements correctly describe the verification of route summarization using Cisco IOS commands? (Choose TWO.)
Quick Answer
The answer is that the 'show ip ospf database summary' command displays Type 3 LSAs generated by the 'area range' command, and the 'show ip route' command reveals the summary route along with its discard route entry. These two commands are correct because verifying route summarization in Cisco IOS requires confirming both the creation of the summary network entry in the routing table and the propagation of the corresponding summary LSA in the OSPF database. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your ability to distinguish between verification tools for OSPF, EIGRP, and BGP summarization, with a common trap being that 'show ip eigrp topology' does not display summary routes by default. A reliable memory tip is to remember that OSPF summarization lives in the database (Type 3 LSAs), while EIGRP summarization lives in the topology table only after enabling 'show ip eigrp topology all-links'.
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 'show ip protocols' command lists the configured summary-address ranges under each routing process.
To verify route summarization, the 'show ip protocols' command displays configured summary-address ranges under each routing process. For OSPF, the 'show ip ospf database summary' command shows Type 3 LSAs generated by the 'area range' command, which is a direct verification of summarization. Option A is incorrect because the 'show ip route' command only displays a Null0 summary route for EIGRP summarization, not for OSPF. Option B is incorrect because 'show ip eigrp topology' does not display summary addresses. Option D is incorrect because 'debug ip routing' does not provide summary-specific events.
Key principle: show ip protocols
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The 'show ip route' command displays the summary route with a next-hop of Null0 for EIGRP and OSPF summarization.
- ✗
The 'show ip eigrp topology' command displays all configured summary addresses and their metrics.
Why it's wrong here
Option B is incorrect. The 'show ip eigrp topology' command shows EIGRP topology entries, not configured summary addresses. Use 'show ip protocols' to see summary addresses.
- ✓
The 'show ip protocols' command lists the configured summary-address ranges under each routing process.
Why this is correct
Option C is correct. The 'show ip protocols' command lists configured summary-address ranges under each routing process, making it a direct verification method.
Related concept
show ip protocols
- ✗
The 'debug ip routing' command provides detailed information about summary route creation and suppression.
Why it's wrong here
Option D is incorrect. The 'debug ip routing' command shows routing table updates but does not provide specific details about summary route creation or suppression.
- ✓
The 'show ip ospf database summary' command displays the Type 3 LSAs, including those generated by the 'area range' command.
Why this is correct
Option E is correct. The 'show ip ospf database summary' command displays Type 3 LSAs, including those generated by the 'area range' command, verifying OSPF summarization.
Related concept
show ip protocols
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many candidates assume that 'show ip route' always shows a discard route for summarization, but this only applies to EIGRP. OSPF uses Type 3 LSAs for summarization verification, requiring the 'show ip ospf database summary' command.
Trap categories for this question
Command / output trap
Option A is incorrect. The 'show ip route' command displays a Null0 summary route only for EIGRP summarization, not for OSPF. OSPF summarization uses 'area range' and generates Type 3 LSAs instead.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- show ip protocols
- OSPF Type 3 LSA
- Verification of summarization
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
show ip protocols
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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.
What to study next
Got this wrong? Here's your next step.
Review show ip protocols, then practise related 300-410 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Route Summarization — This question tests Route Summarization — show ip protocols.
What is the correct answer to this question?
The correct answer is: The 'show ip protocols' command lists the configured summary-address ranges under each routing process. — To verify route summarization, the 'show ip protocols' command displays configured summary-address ranges under each routing process. For OSPF, the 'show ip ospf database summary' command shows Type 3 LSAs generated by the 'area range' command, which is a direct verification of summarization. Option A is incorrect because the 'show ip route' command only displays a Null0 summary route for EIGRP summarization, not for OSPF. Option B is incorrect because 'show ip eigrp topology' does not display summary addresses. Option D is incorrect because 'debug ip routing' does not provide summary-specific events.
What should I do if I get this 300-410 question wrong?
Review show ip protocols, then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
show ip protocols
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Last reviewed: Jun 18, 2026
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