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Latest JN0-423 Exam Practice Questions

The practice questions for JN0-423 exam was last updated on 2026-05-03 .

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Question#1

A PyEZ script connects to a Junos device and needs to read basic device information such as hostname, model, serial number, and Junos version before running additional checks.
Which PyEZ feature is commonly used for this information?

A. Terraform state

B. Ansible handlers

C. YANG choice

D. device facts

Explanation:
PyEZ device facts provide basic information about a Junos device, such as hostname, model, serial number, and software version.

Question#2

A team maintains multiple Junos automation playbooks. They want to package common tasks, templates, defaults, handlers, and files so the same automation logic can be reused across projects.
Which Ansible structure should be used?

A. Vault password prompt

B. Protocol Buffer package

C. YANG notification

D. Role

Explanation:
Ansible roles organize reusable automation content, including tasks, templates, variables, defaults, files, and handlers.

Question#3

A YANG model defines this node:
leaf admin-state {
type enumeration {
enum enabled;
enum disabled;
}
}
What does this represent?

A. A single value limited to defined named options

B. A keyed list of interface entries

C. A reusable group of child schema nodes

D. A Terraform state mapping

Explanation:
A YANG leaf represents a single value. The enumeration type restricts the value to predefined named options.

Question#4

Before a maintenance window, a team captures BGP neighbor state, interface status, and route counts from Junos devices. After the change, they compare the results to expected values.
Which tool is most appropriate?

A. Terraform

B. Ansible Vault

C. JSNAPy

D. Protocol Buffers

Explanation:
JSNAPy is used for Junos snapshot-based testing and operational state validation, especially for pre-change and post-change checks.

Question#5

A YANG model includes this node:
leaf description {
type string;
}
What does this represent?

A. A keyed list of entries

B. A single string value

C. A reusable schema grouping

D. A gRPC service method

Explanation:
A YANG leaf represents a single value. In this case, the value is a string.

Disclaimer

This page is for educational and exam preparation reference only. It is not affiliated with Juniper, JNCIS-DevOps, or the official exam provider. Candidates should refer to official documentation and training for authoritative information.

Exam Code: JN0-423Q & A: 160 Q&AsUpdated: 2026-05-03

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