JN0-423 Exam Preparation Material | Automation and DevOps - Specialist (JNCIS-DevOps)

Prepare for the JN0-423 with reliable study materials, practice questions, and key exam insights.

Prepare for the JN0-423 Automation and DevOps - Specialist (JNCIS-DevOps) exam with CertQueen's independently developed study resources. Review important concepts, practice scenario-based questions, and use clear explanations to identify areas that require further study.

Question#1

A network automation application must update a Junos configuration path through a model-driven gNMI interface.
Which gNMI operation should be used?

A. Get
B. Subscribe
C. Set
D. Snapshot

Explanation:
gNMI Set is used to update, replace, or delete configuration data. Get retrieves values, and Subscribe receives telemetry updates.

Question#2

A Junos telemetry deployment should stream updates only when specific subscribed values change, rather than at a fixed interval.
Which gNMI subscription mode best meets this requirement?

A. ON_CHANGE
B. SAMPLE
C. GET
D. SET

Explanation:
ON_CHANGE sends telemetry updates when subscribed values change. SAMPLE sends updates at a fixed interval.
JN0-423 High-Fidelity Practice Questions - Refined Set 4

Question#3

An engineer needs to retrieve current configuration and operational state from a Junos device through gNMI. The operation must not change the device configuration.
Which gNMI operation should be used?

A. Subscribe
B. Set
C. Get
D. Commit

Explanation:
gNMI Get retrieves configuration or operational state data. It does not modify device configuration.

Question#4

A YANG model contains this statement:
typedef interface-name {
type string;
}
What is the purpose of this statement?

A. It defines a reusable custom type
B. It creates a keyed list of interfaces
C. It starts a telemetry stream
D. It triggers a Junos event script

Explanation:
The typedef statement defines a reusable custom data type that can be referenced by other nodes in the YANG model.

Question#5

A team is comparing JSD/JET-based automation with MGD-based automation. The application requires service-process-based extensibility and programmatic Junos API interaction.
Which statement best describes the correct choice?

A. JSD/JET-based automation is appropriate for this requirement
B. Ansible Vault is required because JET stores encrypted secrets
C. TIG is required because JET stores telemetry in InfluxDB
D. JSNAPy should replace JET because both provide service APIs

Explanation:
JSD/JET-based automation is associated with Junos extensibility and service-process-based automation. MGD-based automation is more closely associated with configuration and commit workflows.

Exam Code: JN0-423
Q & A: 180 Q&As         Updated:  Nov 03,2026

 

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What This JN0-423 Study Resource Helps You Do

Review Key Concepts

Review the technologies, products, processes, and practical skills covered by the current JN0-423 exam objectives.

Practice Scenario-Based Questions

Work through independently developed questions designed to strengthen your understanding of technical scenarios and decision-making.

Identify Knowledge Gaps

Use your results and the provided explanations to find weaker areas and focus your study more effectively.

How to Use This JN0-423 Preparation Material

Review the Exam Scope

Start by reviewing the topics covered by the JN0-423 exam. Compare them with the official exam objectives to understand the required technologies, operational tasks, and practical skills, then identify the areas that deserve the most attention.

Practice Independently

Complete a focused set of practice questions for each topic. On your first attempt, avoid referring to notes, answers, or other study resources so that you can evaluate your current understanding more accurately.

Study the Explanations

Review the answers and explanations after completing each practice session. Understand why the correct option is appropriate for the given scenario and why the other options may be incorrect or less suitable.

Close Knowledge Gaps

Keep track of incorrect answers, unfamiliar concepts, and weaker knowledge areas. Review these topics using official documentation and practical experience, then answer the related questions again to reinforce your understanding and monitor your progress.

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