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350-401 Practice Question: Is configuring model-driven telemetry on a Cisco…
A network engineer is configuring model-driven telemetry on a Cisco IOS-XE router to stream CPU and memory statistics to a collector. The engineer wants to use the YANG model 'Cisco-IOS-XE-process-cpu-oper' and 'Cisco-IOS-XE-memory-oper'. After configuring the telemetry subscription, the engineer notices that no data is being received at the collector. The collector is reachable and the gRPC dial-out is configured correctly. What is the most likely cause of the issue?
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 telemetry subscription is missing the 'source-interface' configuration
That the YANG models are operational data models and require the 'source-address' to be specified under the telemetry receiver, or the subscription must be for operational data. Actually, the most likely cause is that the engineer did not include the 'source-interface' configuration under the telemetry subscription, which is required for dial-out telemetry to ensure the router uses the correct IP address. The other options are incorrect because the collector is reachable, so firewall is not the issue; YANG models are correct; and gRPC is supported.
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 YANG models specified are not supported on IOS-XE
Why it's wrong here
Both 'Cisco-IOS-XE-process-cpu-oper' and 'Cisco-IOS-XE-memory-oper' are supported on IOS-XE.
- ✓
The telemetry subscription is missing the 'source-interface' configuration
Why this is correct
Without a source-interface, the router may use an unreachable IP address, causing the collector to drop the connection or not receive data.
- ✗
The collector is blocking UDP traffic from the router
Why it's wrong here
gRPC uses TCP, not UDP, so UDP blocking is irrelevant.
- ✗
The engineer must enable 'ip http secure-server' for telemetry to work
Why it's wrong here
HTTP secure-server is not required for gRPC telemetry; it is used for RESTCONF.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.