The answer is an SNMPv3 engine ID mismatch, specifically that the NMS must be configured with the router’s engine ID. When you create an SNMPv3 user on a Cisco router without explicitly specifying an engine ID, the router automatically generates one based on its own configuration. The NMS, however, often defaults to its own engine ID or a null value, causing authentication and encryption to fail even when usernames, passwords, and privacy protocols match exactly. On the ENCOR 350-401 exam, this scenario tests your understanding that SNMPv3 security is tied to the authoritative engine ID—a common trap is assuming that matching credentials alone are sufficient. Remember that the engine ID acts as the unique “fingerprint” for the SNMP agent; without it on the NMS, the cryptographic keys derived from the passwords will not align. A quick memory tip: “Engine ID first, then the user is heard”—always verify the engine ID on both sides before troubleshooting anything else.
350-401 SNMP and Syslog Practice Question
This 350-401 practice question tests your understanding of snmp and syslog. 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 configures SNMPv3 on a Cisco router for secure monitoring. The configuration includes 'snmp-server group ADMIN v3 priv', 'snmp-server user admin ADMIN v3 auth sha cisco123 priv aes 128 cisco456', and 'snmp-server host 10.1.1.2 version 3 priv admin'. The NMS is configured with the same credentials. However, the NMS cannot poll the router. The engineer verifies that the router's SNMP agent is enabled. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The NMS must be configured with the router's SNMP engine ID.
SNMPv3 requires proper configuration of authentication and encryption. The issue is that the user is created with authentication and privacy, but the host command specifies 'priv' which is correct. However, the NMS may not be using the correct engine ID. The most common mistake is not specifying the engine ID on the NMS or having a mismatch. But in this scenario, the router's engine ID is automatically generated, and the NMS must match it. The correct answer is that the user configuration is missing the engine ID specification.
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 SNMPv3 user is not associated with the group correctly.
Why it's wrong here
Incorrect because the user 'admin' is assigned to group 'ADMIN' with the correct privileges.
✓
The NMS must be configured with the router's SNMP engine ID.
Why this is correct
Correct because SNMPv3 uses engine IDs for authentication; if the NMS does not have the correct engine ID, it cannot authenticate.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The 'priv' keyword in the host command should be 'auth' instead.
Why it's wrong here
Incorrect because 'priv' indicates both authentication and privacy, which matches the user configuration.
✗
The AES encryption key must be exactly 16 characters.
Why it's wrong here
Incorrect because AES keys can be of varying lengths; the issue is not key length.
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.
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 350-401 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Identify which 350-401 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.
SNMP and Syslog — This question tests SNMP and Syslog — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The NMS must be configured with the router's SNMP engine ID. — SNMPv3 requires proper configuration of authentication and encryption. The issue is that the user is created with authentication and privacy, but the host command specifies 'priv' which is correct. However, the NMS may not be using the correct engine ID. The most common mistake is not specifying the engine ID on the NMS or having a mismatch. But in this scenario, the router's engine ID is automatically generated, and the NMS must match it. The correct answer is that the user configuration is missing the engine ID specification.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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