- A
The NMS is configured to use MD5 authentication, but the router is configured with SHA.
SNMPv3 authentication failure occurs if the authentication protocol mismatches. The debug shows authentication failure, not privacy, so the issue is auth protocol mismatch.
- B
The SNMP engine ID on the router has changed due to a hardware replacement, causing the NMS to have a stale engine ID.
Why wrong: A stale engine ID would cause a different error, such as 'unknown engine ID', not authentication failure.
- C
The NMS is using SNMPv2c community string instead of SNMPv3.
Why wrong: This would cause a different debug message, not authentication failure. The NMS is configured for v3 per the scenario.
- D
The router's clock is not synchronized with NTP, causing authentication key mismatch.
Why wrong: The scenario states time synchronization is correct via NTP, so this is not the issue.
Quick Answer
The answer is that the NMS is configured to use MD5 authentication, while the router is configured with SHA. This is correct because an SNMPv3 authentication failure due to auth protocol mismatch occurs when the hashing algorithm specified in the `snmp-server user` command—SHA in this case—does not match the algorithm configured on the Network Management Station. The debug output shows "Authentication failure" rather than "Privacy failure," which isolates the issue to the authentication layer, not the encryption layer or engine ID mismatch. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to distinguish between authentication and privacy failures, a common trap where candidates overlook protocol mismatch when passwords appear correct. Remember: the engine ID is derived from the router’s MAC address and must match, but here the debug explicitly points to authentication. Memory tip: “SHA vs. MD5—if the hash doesn’t match, the auth will crash.”
300-410 SNMP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of snmp 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.
Router R5 is configured with SNMPv3 for secure management. The configuration includes: snmp-server group mygroup v3 priv, snmp-server user myuser mygroup v3 auth sha myauth priv aes 128 mypriv. The NMS is configured with the same credentials. However, the NMS cannot poll R5. The debug snmp packet shows: 'Authentication failure'. The NMS and R5 have correct time synchronization via NTP. What is the root cause?
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 NMS is configured to use MD5 authentication, but the router is configured with SHA.
SNMPv3 authentication failure can be due to incorrect passwords, but the debug shows 'Authentication failure' specifically. Even with correct passwords, the SNMPv3 engine ID must match. The engine ID is generated from the router's MAC address or configured manually. If the NMS has a different engine ID, authentication fails. However, the most common subtle issue is that the SNMPv3 user is configured with a different authentication protocol than the NMS expects. The debug shows authentication failure, not privacy failure. The correct answer is: 'The NMS is configured to use MD5 authentication, but the router is configured with SHA.'
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 NMS is configured to use MD5 authentication, but the router is configured with SHA.
Why this is correct
SNMPv3 authentication failure occurs if the authentication protocol mismatches. The debug shows authentication failure, not privacy, so the issue is auth protocol mismatch.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The SNMP engine ID on the router has changed due to a hardware replacement, causing the NMS to have a stale engine ID.
Why it's wrong here
A stale engine ID would cause a different error, such as 'unknown engine ID', not authentication failure.
- ✗
The NMS is using SNMPv2c community string instead of SNMPv3.
Why it's wrong here
This would cause a different debug message, not authentication failure. The NMS is configured for v3 per the scenario.
- ✗
The router's clock is not synchronized with NTP, causing authentication key mismatch.
Why it's wrong here
The scenario states time synchronization is correct via NTP, so this is not the issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Scenario analysis trap
This would cause a different debug message, not authentication failure. The NMS is configured for v3 per the scenario.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The NMS is configured to use MD5 authentication, but the router is configured with SHA. — SNMPv3 authentication failure can be due to incorrect passwords, but the debug shows 'Authentication failure' specifically. Even with correct passwords, the SNMPv3 engine ID must match. The engine ID is generated from the router's MAC address or configured manually. If the NMS has a different engine ID, authentication fails. However, the most common subtle issue is that the SNMPv3 user is configured with a different authentication protocol than the NMS expects. The debug shows authentication failure, not privacy failure. The correct answer is: 'The NMS is configured to use MD5 authentication, but the router is configured with SHA.'
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 18, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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