200-901 Understanding and Using APIs Practice Question
In gNMI, what is the difference between dial-in and dial-out streaming?
⚠ Common exam trap
Cisco often tests the direction of connection initiation (client vs. device) as the key differentiator, and the trap here is confusing which side initiates the connection in dial-in versus dial-out, leading candidates to reverse the roles as in Option B.
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-in: client initiates subscription and receives data; dial-out: device pushes data to a configured receiver
In gNMI, dial-in streaming refers to the client initiating a subscription request to the device, which then streams telemetry data back over the same gRPC session. Dial-out streaming, on the other hand, is a server-initiated model where the device (gNMI target) pushes telemetry data to a pre-configured receiver (collector) without waiting for a client request. Option C correctly captures this distinction: dial-in has the client subscribe and receive data, while dial-out has the device push data to a configured receiver.
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-in is for configuration, dial-out for telemetry
Why it's wrong here
Both are for telemetry.
- ✗
Dial-in: device initiates the connection; dial-out: client initiates
Why it's wrong here
Opposite.
- ✓
Dial-in: client initiates subscription and receives data; dial-out: device pushes data to a configured receiver
Why this is correct
Correct description.
- ✗
Dial-in uses gRPC, dial-out uses HTTP
Why it's wrong here
Both use gRPC.
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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.