- A
The network is experiencing a high number of queries, indicating instability.
Why wrong: Only 2 queries were sent, which is low and indicates stability.
- B
The EIGRP process is functioning normally with no signs of congestion or issues.
The traffic statistics are balanced and the input queue is empty, indicating normal operation.
- C
There is a problem with packet loss because more hellos were sent than received.
Why wrong: The difference is minimal (5 packets) and could be due to timing; it does not indicate significant loss.
- D
The router is not receiving acknowledgments for its updates.
Why wrong: Acks received (10) is close to updates sent (10), indicating proper acknowledgment.
Question 1,223 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 traffic
IP-EIGRP Traffic Statistics for process 100 Hellos sent/received: 500/495 Updates sent/received: 10/8 Queries sent/received: 2/1 Replies sent/received: 1/2 Acks sent/received: 8/10 Input queue high water mark: 2, Input queue depth: 0 Total packets sent: 521, received: 516
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 EIGRP process is functioning normally with no signs of congestion or issues.
The output shows a balanced exchange of EIGRP packets with no retransmissions, a low input queue depth of 0, and a high water mark of only 2. These metrics indicate the EIGRP process is stable, with no congestion, packet loss, or neighbor issues. The slight difference between hellos sent (500) and received (495) is normal due to timing or asymmetric paths and does not indicate a 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 network is experiencing a high number of queries, indicating instability.
Why it's wrong here
Only 2 queries were sent, which is low and indicates stability.
- ✓
The EIGRP process is functioning normally with no signs of congestion or issues.
Why this is correct
The traffic statistics are balanced and the input queue is empty, indicating normal operation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
There is a problem with packet loss because more hellos were sent than received.
Why it's wrong here
The difference is minimal (5 packets) and could be due to timing; it does not indicate significant loss.
- ✗
The router is not receiving acknowledgments for its updates.
Why it's wrong here
Acks received (10) is close to updates sent (10), indicating proper acknowledgment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any asymmetry in hello packet counts indicates packet loss, when in fact EIGRP hellos are sent unreliably and a slight mismatch is normal due to timing differences or interface delays.
Detailed technical explanation
How to think about this question
EIGRP uses Reliable Transport Protocol (RTP) for updates, queries, and replies, which require acknowledgment; the Ack counters reflect these confirmations. The input queue depth of 0 and high water mark of 2 indicate that the router never experienced significant backpressure, meaning the CPU can process incoming packets without delay. In real-world troubleshooting, a rising input queue depth or high water mark above 10-20 often signals a slow peer or network congestion, which is absent here.
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 EIGRP process is functioning normally with no signs of congestion or issues. — The output shows a balanced exchange of EIGRP packets with no retransmissions, a low input queue depth of 0, and a high water mark of only 2. These metrics indicate the EIGRP process is stable, with no congestion, packet loss, or neighbor issues. The slight difference between hellos sent (500) and received (495) is normal due to timing or asymmetric paths and does not indicate a 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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