- A
The engineer forgot to configure a 'source-interface' under the destination-group
Why wrong: A source-interface is recommended but not mandatory; the switch will use the management interface by default.
- B
The engineer did not create a 'policy' that binds the sensor-group and destination-group
On Nexus, a telemetry policy is required to link the sensor and destination groups; without it, no data is streamed.
- C
The YANG models for VLAN and STP are not supported in the native telemetry protocol
Why wrong: Nexus supports YANG models for VLAN and STP in the native telemetry protocol.
- D
The engineer used GPB encoding instead of JSON, and the collector only accepts JSON
Why wrong: Encoding mismatch would cause parsing issues, but the collector would still receive data; the issue is that no data is received at all.
CCNP Model-Driven Telemetry Practice Question
This 350-401 practice question tests your understanding of model-driven telemetry. 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 is implementing model-driven telemetry on a Cisco Nexus 9000 switch to monitor VLAN and STP changes. The engineer wants to use the native telemetry protocol with UDP as the transport. After configuring the telemetry subscription with the 'destination-group' and 'sensor-group', the engineer notices that the collector is not receiving any data. The collector is reachable and the UDP port is open. What is the most likely missing configuration?
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 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 engineer did not create a 'policy' that binds the sensor-group and destination-group
The correct answer is that the engineer must configure a 'policy' that associates the sensor-group with the destination-group and commits the configuration. On Nexus switches, model-driven telemetry requires a policy to bind the sensor and destination groups. The other options are incorrect because the source-interface is optional; the YANG models are correct; and the encoding is not the issue.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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 engineer forgot to configure a 'source-interface' under the destination-group
Why it's wrong here
A source-interface is recommended but not mandatory; the switch will use the management interface by default.
- ✓
The engineer did not create a 'policy' that binds the sensor-group and destination-group
Why this is correct
On Nexus, a telemetry policy is required to link the sensor and destination groups; without it, no data is streamed.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The YANG models for VLAN and STP are not supported in the native telemetry protocol
- ✗
The engineer used GPB encoding instead of JSON, and the collector only accepts JSON
Why it's wrong here
Encoding mismatch would cause parsing issues, but the collector would still receive data; the issue is that no data is received at all.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
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Model-Driven Telemetry — study guide chapter
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FAQ
Questions learners often ask
What does this 350-401 question test?
Model-Driven Telemetry — This question tests Model-Driven Telemetry — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: The engineer did not create a 'policy' that binds the sensor-group and destination-group — The correct answer is that the engineer must configure a 'policy' that associates the sensor-group with the destination-group and commits the configuration. On Nexus switches, model-driven telemetry requires a policy to bind the sensor and destination groups. The other options are incorrect because the source-interface is optional; the YANG models are correct; and the encoding is not the issue.
What should I do if I get this 350-401 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
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?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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