- A
EIGRP is using MD5 authentication with key chain EIGRP-KEY, and the interface is actively sending and receiving EIGRP packets.
The output confirms authentication and active interface state.
- B
EIGRP is configured as a passive interface, so no hellos are sent.
Why wrong: The output shows 'Passive interface: No', meaning hellos are sent.
- C
Split horizon is disabled, allowing route advertisement back to the source.
Why wrong: Split horizon is enabled.
- D
The interface is using plain-text authentication.
Why wrong: Authentication is MD5, not plain-text.
Question 1,926 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 interfaces detail Interface GigabitEthernet0/0
EIGRP interface state: Enabled, Up Hello interval: 5 sec, Hold time: 15 sec Split horizon: Enabled Next multicast: 0.0.0.0, Next update: 0.0.0.0 Bandwidth: 10000 Kbit, Delay: 100 us Reliability: 255/255, Load: 1/255, MTU: 1500 Packets sent: 100, received: 95 Authentication: MD5, key chain: EIGRP-KEY Passive interface: No
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
✓
EIGRP is using MD5 authentication with key chain EIGRP-KEY, and the interface is actively sending and receiving EIGRP packets.
The output shows the interface is enabled and up, with MD5 authentication configured using key chain EIGRP-KEY. The 'Packets sent: 100, received: 95' indicates active packet exchange, and 'Passive interface: No' confirms hellos are being sent. This means EIGRP is actively sending and receiving packets with MD5 authentication.
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.
- ✓
EIGRP is using MD5 authentication with key chain EIGRP-KEY, and the interface is actively sending and receiving EIGRP packets.
Why this is correct
The output confirms authentication and active interface state.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EIGRP is configured as a passive interface, so no hellos are sent.
Why it's wrong here
The output shows 'Passive interface: No', meaning hellos are sent.
- ✗
Split horizon is disabled, allowing route advertisement back to the source.
Why it's wrong here
Split horizon is enabled.
- ✗
The interface is using plain-text authentication.
Why it's wrong here
Authentication is MD5, not plain-text.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'Passive interface: No' (meaning hellos are sent) and the passive-interface command (which suppresses hellos), leading candidates to incorrectly assume a passive interface when it is not explicitly stated.
Trap categories for this question
Command / output trap
The output shows 'Passive interface: No', meaning hellos are sent.
Detailed technical explanation
How to think about this question
EIGRP uses MD5 authentication to ensure only trusted routers participate in the routing domain; the key chain 'EIGRP-KEY' must match on neighboring routers. The 'Next multicast: 0.0.0.0' indicates no pending multicast updates, which is normal when the network is stable. In real-world scenarios, authentication misconfiguration (e.g., mismatched keys or key IDs) can cause neighbor adjacency failures even if the interface appears up.
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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: EIGRP is using MD5 authentication with key chain EIGRP-KEY, and the interface is actively sending and receiving EIGRP packets. — The output shows the interface is enabled and up, with MD5 authentication configured using key chain EIGRP-KEY. The 'Packets sent: 100, received: 95' indicates active packet exchange, and 'Passive interface: No' confirms hellos are being sent. This means EIGRP is actively sending and receiving packets with MD5 authentication.
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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