- A
The neighbor is a stub router that only advertises connected and static routes, and it does not participate in query propagation.
The output shows 'Stub Peer Advertising (CONNECTED STATIC) Routes' and 'Suppressing queries', confirming stub behavior.
- B
The neighbor is a normal EIGRP peer that forwards all routes and queries.
Why wrong: The stub designation indicates limited functionality.
- C
The neighbor is not forming an adjacency due to a version mismatch.
Why wrong: The version numbers (12.4/1.2) are compatible, and the adjacency is up.
- D
The neighbor is using a different autonomous system number.
Why wrong: The process number is 100, and the adjacency is established, so AS numbers match.
Question 1,264 of 2,152
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A network engineer runs the following command to troubleshoot an EIGRP issue:
R1# show ip eigrp neighbors detail
IP-EIGRP neighbors for process 100 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.1.2.2 Gi0/0 13 00:12:34 12 200 0 145 Version 12.4/1.2, Retrans: 0, Retries: 0, Prefixes: 5 Topology-ids from peer - 0 Stub Peer Advertising (CONNECTED STATIC) Routes Suppressing queries
What does this output indicate?
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 neighbor is a stub router that only advertises connected and static routes, and it does not participate in query propagation.
The output shows 'Stub Peer Advertising (CONNECTED STATIC) Routes' and 'Suppressing queries', which indicates the neighbor is configured as an EIGRP stub router. A stub router advertises only connected and static routes (as specified) and does not participate in query propagation, meaning it will not forward queries from other routers, reducing the query domain and improving convergence.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 neighbor is a stub router that only advertises connected and static routes, and it does not participate in query propagation.
Why this is correct
The output shows 'Stub Peer Advertising (CONNECTED STATIC) Routes' and 'Suppressing queries', confirming stub behavior.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The neighbor is a normal EIGRP peer that forwards all routes and queries.
Why it's wrong here
The stub designation indicates limited functionality.
- ✗
The neighbor is not forming an adjacency due to a version mismatch.
Why it's wrong here
The version numbers (12.4/1.2) are compatible, and the adjacency is up.
- ✗
The neighbor is using a different autonomous system number.
Why it's wrong here
The process number is 100, and the adjacency is established, so AS numbers match.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a normal EIGRP peer and a stub peer by hiding the 'Suppressing queries' line in the output, leading candidates to overlook the stub behavior and incorrectly assume the peer is a normal router forwarding all routes.
Detailed technical explanation
How to think about this question
EIGRP stub routing is configured with the 'eigrp stub' command, which limits the routes the stub router advertises (e.g., connected, static, summary) and causes it to reply to queries with an 'infinite metric' (poison route) rather than propagating them. This design is critical in hub-and-spoke topologies to prevent query storms from reaching remote spokes, reducing convergence time and resource usage. The 'Suppressing queries' flag in the output confirms that the stub router will not forward queries to other neighbors, a behavior enforced by the EIGRP stub feature.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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
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FAQ
Questions learners often ask
What does this 300-410 question test?
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The neighbor is a stub router that only advertises connected and static routes, and it does not participate in query propagation. — The output shows 'Stub Peer Advertising (CONNECTED STATIC) Routes' and 'Suppressing queries', which indicates the neighbor is configured as an EIGRP stub router. A stub router advertises only connected and static routes (as specified) and does not participate in query propagation, meaning it will not forward queries from other routers, reducing the query domain and improving convergence.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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