350-501 Automation and Assurance Practice Question
A Cisco XR router is configured to stream telemetry via gRPC with TLS. The collector can connect but receives empty data. The telemetry configuration is as follows: sensor-group with 'openconfig-interfaces' paths. What is the likely cause?
⚠ Common exam trap
Cisco often tests the distinction between a successful connection (TCP/TLS handshake) and actual data delivery, trapping candidates who assume a working connection implies correct path configuration.
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 sensor-group path is not supported by the device
The collector can establish a gRPC-TLS connection but receives empty data because the sensor-group path 'openconfig-interfaces' is not supported on the Cisco XR router. Cisco IOS XR supports OpenConfig paths only if the corresponding YANG models are loaded and the device implements those models; if the path is unsupported, the router will accept the subscription but send no telemetry data for that path. This is a common misconfiguration when using gRPC telemetry with OpenConfig models on platforms that may not fully support all OpenConfig paths.
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 router's CPU is overloaded
Why it's wrong here
CPU overload could cause delays but not empty data; data would still be sent.
- ✓
The sensor-group path is not supported by the device
Why this is correct
An unsupported YANG path results in an empty subscription; the device may not implement openconfig-interfaces.
- ✗
The collector does not support TLS
Why it's wrong here
The collector can connect, so TLS handshake succeeded.
- ✗
The telemetry interval is too short
Why it's wrong here
A short interval would still produce data; empty data indicates no data source.
- ✗
The destination group is missing the 'encoding' configuration
Why it's wrong here
Missing encoding might cause errors but not empty data; default encoding is GPB.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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