- JNCIS-DevOps is Juniper's specialist-level Automation and DevOps credential, tested by exam JN0-423 against Junos OS 24.4.
- The exam has 65 multiple-choice questions in 90 minutes, delivered in English, with a standard voucher price of USD 300.
- Five domains: Platform Automation Overview, gRPC, Ansible, Junos Automation Scripts and YANG. Percentage weights are unpublished.
- JNCIA-DevOps is the prerequisite, and the credential stays active for three years before renewal is required.
What the JNCIS-DevOps Certification Actually Is
JNCIS-DevOps stands for Juniper Networks Certified Specialist, Automation and DevOps. It is the specialist-level step in Juniper's DevOps certification track, sitting above the associate-level JNCIA-DevOps. Where the associate exam establishes vocabulary and fundamentals, the specialist exam expects you to understand how automation is actually implemented on Junos platforms: which process handles what, which protocol carries which data, and which script type fires on which trigger.
The current exam is JN0-423, which launched on October 6, 2025 and replaced JN0-422, which retired on October 5, 2025. Its technical scope is anchored to Junos OS 24.4. That matters for study materials: older outlines, cached exam objectives and references to Junos 21.3 describe a previous scope and should not be blended into your preparation. If you want a quick orientation on naming, see our explainers on what JNCIS-DevOps stands for and the broader JNCIS-DevOps certification overview.
Who Should Pursue It and Who Hires for It
The credential targets network engineers who are moving from box-by-box CLI administration toward programmatic operations: infrastructure-as-code, templated configuration, automated validation and streaming telemetry. Typical roles that value this skill set include network automation engineers, NetDevOps engineers, site reliability engineers who own network infrastructure, and operations engineers at service providers and enterprises running Junos-based fabrics.
Employers that run Juniper-heavy environments, including service providers, data center operators, managed-service firms and large enterprises, tend to be the ones who recognize the credential. Because it validates both Junos knowledge and automation tooling, it signals that you can bridge a network team and a DevOps team. For job-market context, see our pages on JNCIS-DevOps jobs and the ROI analysis for the certification. Compensation varies widely by region and role, so treat any single salary claim with caution; our salary guide discusses the factors qualitatively.
Exam Format, Delivery and Fee Mechanics
| Item | Detail |
|---|---|
| Exam code | JN0-423 |
| Language | English |
| Questions | 65 multiple-choice |
| Time | 90 minutes |
| Standard specialist voucher | USD 300 |
| Delivery | Pearson VUE test center or OnVUE (remote) |
| Scheduling | Through Alpine CertMetrics with your hpe.com account, per current issuer instructions |
| Platform version | Junos OS 24.4 |
Two points deserve emphasis. First, the verified assessment is a written multiple-choice exam, not a hands-on lab. Lab practice absolutely helps you learn, but you will be answering questions about what a playbook, script or gNMI subscription does rather than building one live. Second, the split between scored and unscored questions has not been verified, so do not assume every question counts.
The voucher is listed at USD 300 and no member versus nonmember price schedule was identified. Retake fees, taxes and regional pricing can differ, so confirm the final amount at checkout. Our certification cost breakdown covers budgeting, and exam dates and scheduling explains booking logistics.
The Five Domains in Detail
Juniper publishes the exam scope as five high-level objective headings. Percentage weights are not published, so the count of five does not imply equal weighting, and no domain can be declared the heaviest. Prepare for all five. A deeper walkthrough lives in our complete guide to all 5 content areas; here is the practical summary.
Domain 1: Platform Automation Overview
This domain frames how automation hooks into the Junos architecture and which tooling fits which layer.
- MGD, the management process, and how management-plane automation interacts with it
- Terraform and the Juniper Extension Toolkit (JET) with the JSD service process for service-process automation
- Python and PyEZ as the scripting and library foundation referenced in the overview
Domain 2: gRPC
Expect questions on how streaming and programmatic interfaces work end to end, covering both configuration automation and telemetry.
- The gRPC protocol and protocol buffers as the serialization format
- gRPC and gNMI used for both automation and telemetry
- OpenConfig models, sensor paths and the gNMIc client
- The TIG stack (Telegraf, InfluxDB, Grafana) for collecting and visualizing telemetry
Domain 3: Ansible
This domain tests whether you can read, interpret and reason about Ansible content used against Junos devices.
- Ansible-supported files and playbook structure
- Ansible Vault for protecting secrets
- JSNAPy for pre- and post-change snapshot validation
- Jinja2 templates for generating device configuration from variables
Domain 4: Junos Automation Scripts
On-box scripting is a distinctive Junos feature, and the exam checks that you know the script types and their triggers.
- Commit scripts, op scripts, event scripts and SNMP scripts
- The concepts, benefits and operation of each type
- Choosing the right script type for a given operational scenario
Domain 5: YANG
YANG underpins model-driven management, so candidates must read and reason about models rather than just name them.
- YANG implementation on Junos
- OpenConfig configuration models versus native models
- YANG syntax and data types
Notice how the domains interlock: OpenConfig and protocol buffers appear in both the gRPC and YANG discussions, and Jinja2 templating connects naturally to the scripting and Ansible material. Studying the connections helps with scenario-style questions that mix concepts.
Prerequisite, Version Scope and Renewal
Prerequisite
JNCIA-DevOps is the prerequisite certification. Recommended training is optional. Associate preparation does not replace the specialist objectives, so passing the associate exam does not mean you have covered what JN0-423 asks. Our requirements page walks through eligibility in more detail.
Renewal and expiry
The certification is active for three years. You can renew before expiration by passing an eligible examination or by completing a designated instructor-led or On-Demand course. For the specialist level, the course-renewal table lists Junos Platform Automation and NetDevOps or Advanced Junos Platform Automation and NetDevOps. Only one eligible course is required, and Open Learning does not qualify for this route.
Scoring: What Is and Is Not Published
Juniper does not publish the numerical passing score. It appears on your score report after the exam, and initial passing results are provisional. The aggregate candidate pass rate has also not been verified, so be skeptical of any site that quotes a precise figure. A practice assessment's passing threshold is not the live exam's cut score and should never be treated as one. Our pages on the passing score and pass rate explain what can and cannot be stated responsibly.
The practical consequence: since you cannot target a known percentage, aim for comfortable competence in every domain rather than gambling on skipping one. For a realistic sense of difficulty, read how hard the JNCIS-DevOps exam is.
A Domain-Ordered Preparation Sequence
Rather than a generic schedule, sequence your study so each domain builds on the last. This is one reasonable order for a candidate who already holds JNCIA-DevOps and has some lab access to Junos 24.4.
Platform Automation Overview and YANG groundwork
- Map MGD, JET/JSD and Terraform roles on the platform
- Review Python and PyEZ basics
- Read YANG syntax and data types, since later domains lean on models
gRPC, gNMI and telemetry
- Study protocol buffers and the gRPC protocol
- Practice sensor paths and gNMIc commands
- Sketch how the TIG stack ingests and displays telemetry
Ansible and templating
- Read playbooks and supported file types line by line
- Use Vault, JSNAPy and Jinja2 in a small lab workflow
Junos automation scripts, then full review
- Distinguish commit, op, event and SNMP scripts by trigger and purpose
- Take original practice questions and revisit weak domains
For a fuller plan, see the JNCIS-DevOps study guide, and keep the one-page cheat sheet handy for final review. Use original practice material only; recalled live-exam items are off limits and unreliable. You can try realistic, original-style questions on our JNCIS-DevOps practice test site, which is independent and not officially sponsored by the issuer.
Key Takeaway
Because this is a written exam, practice explaining what a given playbook, script, YANG snippet or gNMI subscription will do before you run it. If you can predict the outcome from reading alone, you are preparing in the format you will be tested in.
Frequently Asked Questions
It certifies specialist-level knowledge of Junos automation and DevOps: platform automation concepts, gRPC and telemetry, Ansible, Junos automation scripts and YANG, tested on Junos OS 24.4 through exam JN0-423.
JN0-423 has 65 multiple-choice questions and a 90-minute time limit, delivered in English. The scored versus unscored split has not been verified.
Yes, JNCIA-DevOps is the prerequisite certification. Recommended training is optional, but associate-level preparation does not substitute for the specialist objectives.
Juniper does not publish a numerical passing score. It appears on your score report, and initial passing results are provisional. Do not treat a practice test's threshold as the real cut score.
It is active for three years. Renew before expiration by passing an eligible exam or completing Junos Platform Automation and NetDevOps or Advanced Junos Platform Automation and NetDevOps. Open Learning does not qualify, and an expired credential means restarting the track.
For a plain-language summary of the name itself, you can also read What Is JNCIS-DevOps?, then return to the domain guide when you are ready to plan your preparation in earnest.