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Juniper · DevOps & Automation · Professional

Juniper JNCIS-DevOps exam guide

Exam JN0-423

JNCIS-DevOps validates intermediate network automation skills for Junos: Python and PyEZ, Ansible, NETCONF and REST APIs, data templating and on-box automation. JN0-423 replaced JN0-422 in October 2025.

Questions65
Time limit90 minutes
Passing scoreSee official page
Exam fee$300 USD
Valid for3 years
DeliveryPearson VUE test center or online proctored

Format: Multiple choice.

Who it's for

Network automation engineers who hold JNCIA-DevOps and write production automation for Junos devices.

What the exam covers

Junos Automation Stack—
NETCONF and XML API—
Python and PyEZ—
Ansible—
Data Serialization and Jinja2 Templating—
Junos REST API—
On-Box Automation—

A dash means the vendor does not publish a weight for that domain.

Eligibility & prerequisites

Required: A valid JNCIA-DevOps certification.

Recommended: Practical Python and Ansible experience with Junos.

Keeping it active

Valid for 3 years. Recertify by passing the current version of the same exam or a higher-level exam in the same track before expiry; recertifying a higher level also renews the lower-level certifications in that track.

Skills & careers

Skills it validates

  • Writing PyEZ scripts for configuration and operational data
  • Building Ansible playbooks and roles for Junos
  • Templating configuration with Jinja2
  • Calling NETCONF and REST APIs
  • Writing on-box scripts
  • Integrating automation with version control and CI

Job roles

Network Automation EngineerNetDevOps EngineerDevOps EngineerSite Reliability EngineerNetwork Software Engineer

Where it fits in your path

Planning a degree too? See how this cert earns college credit in the College Credit Navigator.

Build my study plan

  1. Week 1: PyEZ deep dive: tables and views, config utilities, exception handling.
  2. Week 2: Ansible roles, Junos modules, Jinja2 templating.
  3. Week 3: NETCONF, REST API and on-box automation scripts.
  4. Week 4: Build an end-to-end automation project; practice questions and book.

Make it yours: pick your exam date and weekly hours. We'll split your time by domain weight and give you a printable plan.

Exam-day tips

  • Expect code-reading questions; predict the output of PyEZ and Ansible snippets.
  • Know Jinja2 loops and conditionals syntax precisely.
  • Understand configuration load modes (merge, replace, override) and their effects.
  • Know when to use on-box vs off-box automation.
  • Juniper does not publish the passing score or objective weights, so cover every listed objective rather than gambling on a few.

Key terms for this exam

All 2 terms Study with thinQcards™

Frequently asked questions

Do I need JNCIA-DevOps first?

Yes, JNCIA-DevOps is required.

How much does JNCIS-DevOps cost?

Juniper specialist exams have historically been $300 USD; confirm when booking.

How long is it valid?

3 years.

Is there a JNCIP-DevOps?

JNCIS-DevOps is currently the highest level in Juniper's automation track.

Is it worth it?

Yes for automation-focused engineers in Juniper shops; the skills transfer to multi-vendor automation work.

Official page: www.juniper.net. Reviewed November 2026. Vendors change fees and objectives, so confirm with the vendor before you book. Spot something out of date? Tell us.