- A
The neighbor is operating normally with no issues.
All parameters are within normal range, and the neighbor is fully established.
- B
The interface is configured as passive, preventing neighbor formation.
Why wrong: The output says 'Passive interface: No', meaning it is not passive.
- C
The neighbor has a high number of retransmissions.
Why wrong: Retransmissions are 0, indicating no issues.
- D
The hold time of 15 seconds is too short and may cause flapping.
Why wrong: The hold time of 15 seconds is the default for EIGRP on LAN interfaces and is acceptable.
Question 429 of 2,152
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. 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.
A network engineer runs the following command on Router R1:
R1# show ip eigrp neighbors detail
EIGRP-IPv4 Neighbors for AS(100) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.1.1.2 Gi0/0 13 00:12:34 12 200 0 45 Version 12.0/2.0, Retrans: 0, Retries: 0, Restarts: 0 Topology ids from peer: 0 Passive interface: No Hello interval: 5 Hold time: 15
Based on this output, what is the problem?
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 operating normally with no issues.
The output shows a fully established EIGRP neighbor adjacency with no errors. The 'Passive interface: No' confirms the interface is not configured as passive, the retransmission count is 0, and the hold time of 15 seconds is the default for a 5-second hello interval on high-speed interfaces. All metrics (SRTT, RTO, Q count, Seq Num) indicate stable operation, so there is no problem.
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 operating normally with no issues.
Why this is correct
All parameters are within normal range, and the neighbor is fully established.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The interface is configured as passive, preventing neighbor formation.
Why it's wrong here
The output says 'Passive interface: No', meaning it is not passive.
- ✗
The neighbor has a high number of retransmissions.
Why it's wrong here
Retransmissions are 0, indicating no issues.
- ✗
The hold time of 15 seconds is too short and may cause flapping.
Why it's wrong here
The hold time of 15 seconds is the default for EIGRP on LAN interfaces and is acceptable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a hold time of 15 seconds is too short, but in EIGRP this is the default for high-speed interfaces and is perfectly normal; candidates may confuse it with OSPF's shorter dead intervals or misinterpret the 'Passive interface' field if they do not read the 'No' value.
Trap categories for this question
Command / output trap
The output says 'Passive interface: No', meaning it is not passive.
Detailed technical explanation
How to think about this question
EIGRP uses a default hello interval of 5 seconds and a hold time of 15 seconds on most LAN interfaces (per RFC 7868). The hold time is three times the hello interval, providing sufficient tolerance for transient packet loss. The 'SRTT' (Smooth Round-Trip Time) of 12 ms and 'RTO' (Retransmission Timeout) of 200 ms indicate low latency and no congestion. The 'Q Cnt' of 0 confirms no packets are queued for retransmission, and the 'Seq Num' of 45 shows normal sequence number tracking.
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 operating normally with no issues. — The output shows a fully established EIGRP neighbor adjacency with no errors. The 'Passive interface: No' confirms the interface is not configured as passive, the retransmission count is 0, and the hold time of 15 seconds is the default for a 5-second hello interval on high-speed interfaces. All metrics (SRTT, RTO, Q count, Seq Num) indicate stable operation, so there is no problem.
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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