- A
Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity.
A peer count of 0 means no EIGRP adjacency exists on that interface.
- B
All interfaces have at least one EIGRP neighbor.
Why wrong: Gi0/4 has 0 peers, so not all interfaces have a neighbor.
- C
The mean SRTT on Gi0/2 is 18 ms, which is too high and indicates a problem.
Why wrong: 18 ms is a normal SRTT value for EIGRP.
- D
The pending routes count of 0 on all interfaces indicates a routing loop.
Why wrong: A pending routes count of 0 is normal and indicates no routes are waiting to be processed.
Question 2,018 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 on Router R1:
R1# show ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(100) Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Gi0/0 1 0/0 12 0/10 50 0 Gi0/1 1 0/0 15 0/10 50 0 Gi0/2 1 0/0 18 0/10 50 0 Gi0/3 1 0/0 20 0/10 50 0 Gi0/4 0 0/0 0 0/10 50 0
Based on this output, which statement is correct?
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
✓
Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity.
The output shows that interface Gi0/4 has 0 peers, while all other interfaces have 1 peer. In EIGRP, a peer count of 0 indicates that no neighbor adjacency has been formed on that interface. This could be due to a configuration mismatch (e.g., different AS numbers, passive interface, or authentication) or a Layer 1/2 connectivity issue. Therefore, option A is correct.
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.
- ✓
Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity.
Why this is correct
A peer count of 0 means no EIGRP adjacency exists on that interface.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
All interfaces have at least one EIGRP neighbor.
Why it's wrong here
Gi0/4 has 0 peers, so not all interfaces have a neighbor.
- ✗
The mean SRTT on Gi0/2 is 18 ms, which is too high and indicates a problem.
Why it's wrong here
18 ms is a normal SRTT value for EIGRP.
- ✗
The pending routes count of 0 on all interfaces indicates a routing loop.
Why it's wrong here
A pending routes count of 0 is normal and indicates no routes are waiting to be processed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misinterpretation of SRTT values as indicators of problems, when in fact normal SRTT values vary by network and are not inherently problematic unless they are excessively high (e.g., >5000 ms) or accompanied by retransmissions.
Detailed technical explanation
How to think about this question
The 'show ip eigrp interfaces' command displays per-interface EIGRP statistics, including the number of peers (neighbors) discovered. The Mean SRTT (Smooth Round-Trip Time) is an average of RTT measurements used by EIGRP to calculate the metric and to set the retransmission timeout (RTO). A value of 0 for pending routes means there are no routes waiting to be processed in the EIGRP topology table, which is typical in a stable network. In real-world scenarios, a missing neighbor on a single interface often points to a Layer 2 issue (e.g., VLAN mismatch) or a misconfigured EIGRP parameter (e.g., passive-interface default).
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: Interface Gi0/4 has no EIGRP neighbor, which may indicate a configuration issue or lack of connectivity. — The output shows that interface Gi0/4 has 0 peers, while all other interfaces have 1 peer. In EIGRP, a peer count of 0 indicates that no neighbor adjacency has been formed on that interface. This could be due to a configuration mismatch (e.g., different AS numbers, passive interface, or authentication) or a Layer 1/2 connectivity issue. Therefore, option A is correct.
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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