- A
Dial-in is for configuration, dial-out for telemetry
Why wrong: Both are for telemetry.
- B
Dial-in: device initiates the connection; dial-out: client initiates
Why wrong: Opposite.
- C
Dial-in: client initiates subscription and receives data; dial-out: device pushes data to a configured receiver
Correct description.
- D
Dial-in uses gRPC, dial-out uses HTTP
Why wrong: Both use gRPC.
Question 152 of 1,000
200-901 Understanding and Using APIs Practice Question
This 200-901 practice question tests your understanding of understanding and using apis. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In gNMI, what is the difference between dial-in and dial-out streaming?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dial-in uses gRPC, dial-out uses HTTP
Why it's wrong here
Both use gRPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, dial-in uses the Subscribe RPC where the client sends a SubscriptionList message and the device streams updates via SubscribeResponse messages. Dial-out uses the gNMI DialOut service, where the device acts as a gRPC client to a collector, sending TelemetryRequest messages that contain path-value pairs. A real-world scenario: dial-in is ideal for on-demand monitoring from a NMS, while dial-out is used for continuous streaming to a centralized telemetry receiver like Kafka or InfluxDB, reducing connection overhead.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Understanding and Using APIs — study guide chapter
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FAQ
Questions learners often ask
What does this 200-901 question test?
Understanding and Using APIs — This question tests Understanding and Using APIs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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