- A
The 'show ip route' command displays the summary route with a next-hop of Null0 for EIGRP and OSPF summarization.
Correct. Both EIGRP and OSPF install a discard route (to Null0) for the summary prefix to prevent loops, visible in 'show ip route'.
- B
The 'show ip eigrp topology' command displays all configured summary addresses and their metrics.
Why wrong: Incorrect. The 'show ip eigrp topology' command shows EIGRP topology entries, but summary routes are not displayed there unless they are learned. Use 'show ip eigrp interfaces detail' or 'show ip protocols' to see configured summaries.
- C
The 'show ip protocols' command lists the configured summary-address ranges under each routing process.
Correct. For both EIGRP and OSPF, 'show ip protocols' displays configured summary addresses and their associated interfaces or areas.
- D
The 'debug ip routing' command provides detailed information about summary route creation and suppression.
Why wrong: Incorrect. 'debug ip routing' shows routing table updates but does not specifically highlight summary route operations. Protocol-specific debugs like 'debug eigrp fsm' or 'debug ip ospf lsa-generation' are needed.
- E
The 'show ip ospf database summary' command displays the Type 3 LSAs, including those generated by the 'area range' command.
Correct. The 'show ip ospf database summary' command shows all Type 3 LSAs, which include inter-area summary routes created by the 'area range' command.
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'.
300-410 Route Summarization Practice Question
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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.)
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 route' command displays the summary route with a next-hop of Null0 for EIGRP and OSPF summarization.
To verify route summarization, engineers use 'show ip route' to see the summary route and discard entry, 'show ip protocols' to view configured summary addresses, and 'show ip ospf database' to see Type 3 summary LSAs. The 'show ip eigrp topology' command does not show summary routes by default, and 'debug ip routing' shows routing table changes but not summary-specific events.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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
Incorrect. The 'show ip eigrp topology' command shows EIGRP topology entries, but summary routes are not displayed there unless they are learned. Use 'show ip eigrp interfaces detail' or 'show ip protocols' to see configured summaries.
- ✓
The 'show ip protocols' command lists the configured summary-address ranges under each routing process.
- ✗
The 'debug ip routing' command provides detailed information about summary route creation and suppression.
- ✓
The 'show ip ospf database summary' command displays the Type 3 LSAs, including those generated by the 'area range' command.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
Incorrect. The 'show ip eigrp topology' command shows EIGRP topology entries, but summary routes are not displayed there unless they are learned. Use 'show ip eigrp interfaces detail' or 'show ip protocols' to see configured summaries.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
- →
Route Summarization — study guide chapter
Learn the concepts, then practise the questions
- →
Route Summarization practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 300-410 question test?
Route Summarization — This question tests Route Summarization — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The 'show ip route' command displays the summary route with a next-hop of Null0 for EIGRP and OSPF summarization. — To verify route summarization, engineers use 'show ip route' to see the summary route and discard entry, 'show ip protocols' to view configured summary addresses, and 'show ip ospf database' to see Type 3 summary LSAs. The 'show ip eigrp topology' command does not show summary routes by default, and 'debug ip routing' shows routing table changes but not summary-specific events.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 18, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.