- A
The NMS is not configured to respond to SNMP informs, so the router does not receive acknowledgment.
Correct because informs require an acknowledgment; if the NMS does not support it, informs fail.
- B
The 'snmp-server host' command should use 'traps' instead of 'informs' for SNMPv3.
Why wrong: Incorrect because SNMPv3 supports both traps and informs; the command syntax is valid.
- C
The router needs the 'snmp-server enable informs' command globally.
Why wrong: Incorrect because 'snmp-server host informs' enables informs; no separate global command is needed.
- D
The SNMPv3 user must have the 'auth' privilege instead of 'priv' to send informs.
Why wrong: Incorrect because informs can use any security level; 'priv' is acceptable.
Question 2,000 of 2,152
Troubleshooting SNMPv3 Informs: NMS Not Acknowledging
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.
An engineer is troubleshooting why SNMPv3 informs are not being received by the NMS from router R6. 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 10.1.1.100 informs version 3 priv admin'. The NMS can receive SNMPv3 traps from other routers. 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.
Quick Answer
The answer is that the NMS is not configured to respond to SNMP informs, so the router does not receive acknowledgment. SNMPv3 informs differ from traps because they require the NMS to send back a confirmation receipt; without this acknowledgment, the router will repeatedly retransmit the inform until it times out and fails. The router’s configuration is correct, with the group, user, and host statements properly set for informs, so the issue lies entirely on the NMS side—it must support inform processing and be configured to reply. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the SNMPv3 inform mechanism versus traps, a common point of confusion where candidates assume the problem is always on the router. A helpful memory tip: “Informs need confirms—if the NMS doesn’t reply, the router’s cry goes by.”
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 not configured to respond to SNMP informs, so the router does not receive acknowledgment.
SNMPv3 informs require the NMS to send an acknowledgment back to the router. If the NMS is not configured to respond to informs, the router never receives the acknowledgment and will not send the inform. The configuration shown is correct for sending informs, so the issue is likely on the NMS side, especially since the NMS can receive traps from other routers.
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 not configured to respond to SNMP informs, so the router does not receive acknowledgment.
Why this is correct
Correct because informs require an acknowledgment; if the NMS does not support it, informs fail.
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 'snmp-server host' command should use 'traps' instead of 'informs' for SNMPv3.
Why it's wrong here
Incorrect because SNMPv3 supports both traps and informs; the command syntax is valid.
- ✗
The router needs the 'snmp-server enable informs' command globally.
Why it's wrong here
Incorrect because 'snmp-server host informs' enables informs; no separate global command is needed.
- ✗
The SNMPv3 user must have the 'auth' privilege instead of 'priv' to send informs.
Why it's wrong here
Incorrect because informs can use any security level; 'priv' is acceptable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between traps (unconfirmed) and informs (confirmed), leading candidates to incorrectly assume that a missing global command or wrong privilege level is the cause, rather than the NMS's inability to acknowledge the inform.
Trap categories for this question
Command / output trap
Incorrect because SNMPv3 supports both traps and informs; the command syntax is valid.
Detailed technical explanation
How to think about this question
SNMP informs are confirmed notifications that use the same SNMPv3 message format as traps but require the NMS to send an SNMPv3 Response PDU (acknowledgment) back to the agent. If the NMS does not support or is not configured to send this response (e.g., missing inform listener or ACL blocking return traffic), the agent will retransmit the inform up to a default number of times (typically 3) and then drop it. In real-world scenarios, this often occurs when the NMS is a simple trap receiver that does not implement the inform acknowledgment logic.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
SNMP Troubleshooting — study guide chapter
Learn the concepts, then practise the questions
- →
SNMP Troubleshooting practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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 not configured to respond to SNMP informs, so the router does not receive acknowledgment. — SNMPv3 informs require the NMS to send an acknowledgment back to the router. If the NMS is not configured to respond to informs, the router never receives the acknowledgment and will not send the inform. The configuration shown is correct for sending informs, so the issue is likely on the NMS side, especially since the NMS can receive traps from other routers.
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.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 300-410 practice questions
- Drag and drop the steps to negotiate an IKEv2 IPsec site-to-site tunnel into the correct order, from first to last.
- Drag and drop the steps to troubleshoot an IPsec site-to-site VPN adjacency failure into the correct order, from first t…
- Drag and drop the steps to verify and validate the operational state of an IPsec site-to-site VPN into the correct order…
- Consider the following configuration snippet: ip cef ! interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.25…
- A router is configured with 'logging host 10.1.1.100' and 'logging trap informational'. The engineer notices that syslog…
- Drag and drop the steps to configure a GRE tunnel for IPv6 over IPv4 into the correct order, from first to last.
Last reviewed: Jul 4, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.