200-901 Understanding and Using APIs Practice Question
When using gRPC/gNMI for model-driven telemetry, which mode allows the network device to push telemetry data to a collector without the collector initiating the connection?
⚠ Common exam trap
Cisco often tests the distinction between dial-in and dial-out by reversing the roles of client and server, so the trap here is confusing the direction of connection initiation with the direction of data flow.
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
✓
Dial-out
In gRPC/gNMI-based model-driven telemetry, dial-out mode enables the network device (server) to initiate a connection to the collector (client) and push telemetry data without any prior request from the collector. This is the correct mode for unsolicited streaming telemetry, as defined in the gNMI specification (gRPC Network Management Interface).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Dial-out
Why this is correct
Dial-out has the device push data to the collector.
- ✗
gRPC streaming
Why it's wrong here
gRPC streaming can be used in both modes.
- ✗
Streaming pull
Why it's wrong here
This is not a standard gNMI term.
- ✗
Dial-in
Why it's wrong here
Dial-in requires the collector to connect to the device.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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