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300-410 Practice Question: An engineer is troubleshooting why SNMPv3 informs…
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?
⚠ Common exam trap
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.
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.
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.
- ✗
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.
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 |
Go deeper
Related to this question
Learn chapter
Device Management and Network Monitoring (SNMP, Syslog, NetFlow)
Key term
SNMPv3 Configuration
SNMPv3 configuration is the process of setting up the third version of the Simple Network Management Protocol on network devices to securely monitor and manage them using authentication and encryption.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.