200-901 Understanding and Using APIs Practice Question
A network engineer wants to stream telemetry data from a Cisco router using gRPC. Which gRPC service model is typically used for the router to push data to a collector?
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 model
Dial-out streaming (also called telemetry push) is where the device initiates the connection and sends data to the collector. Dial-in is where the collector pulls data from the device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RESTCONF events
Why it's wrong here
RESTCONF events are HTTP-based notifications, not gRPC streams, so they cannot deliver the required gRPC telemetry. It is tempting because RESTCONF also pushes YANG-modeled data, and would be correct for an HTTP webhook or notification receiver rather than a gRPC collector.
- ✗
NETCONF subscription
Why it's wrong here
NETCONF subscription is a separate YANG-based mechanism, not a gRPC service model, so it cannot satisfy a gRPC streaming requirement. It is tempting because NETCONF also supports event notifications, and would be correct if the collector subscribed over NETCONF rather than gRPC.
- ✗
Dial-in model
Why it's wrong here
Dial-in describes a collector connecting to the router, which reverses the required direction; gRPC telemetry uses dial-out, where the router initiates the session and pushes data to the collector. Dial-in is tempting because it matches traditional SNMP polling, where the management station queries the device.
- ✓
Dial-out model
Why this is correct
In the dial-out model the router initiates the gRPC connection to the collector and streams telemetry over it, which suits devices behind NAT or firewalls. Dial-in would require the collector to connect inbound to the router instead.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.