- A
Dial-out
Dial-out has the device push data to the collector.
- B
gRPC streaming
Why wrong: gRPC streaming can be used in both modes.
- C
Streaming pull
Why wrong: This is not a standard gNMI term.
- D
Dial-in
Why wrong: Dial-in requires the collector to connect to the device.
Question 686 of 1,000
200-901 Understanding and Using APIs Practice Question
This 200-901 practice question tests your understanding of understanding and using apis. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
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?
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).
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-out
Why this is correct
Dial-out has the device push data to the collector.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
In dial-out mode, the device acts as a gRPC server and the collector as a client, but the device proactively establishes the connection to a pre-configured collector address. This is typically configured using the 'telemetry' CLI with a 'destination-group' specifying the collector IP and port, and the device uses a persistent TCP connection to stream SubscribeResponse messages. A real-world scenario is when a device behind NAT cannot be reached by the collector, so dial-out ensures the device can push data to a central collector.
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.
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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-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).
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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