- The One-Glance Exam Snapshot
- Fees, Scheduling and Test-Day Rules
- Domain 1: Platform Automation Overview
- Domain 2: gRPC
- Domain 3: Ansible
- Domain 4: Junos Automation Scripts
- Domain 5: YANG
- A Domain-by-Domain Study Sequence
- Renewal, Expiry and Who Hires for This Skill Set
- Version and Scope Traps to Avoid
- Frequently Asked Questions
- The current exam is JN0-423: 65 multiple-choice questions in 90 minutes, in English, targeting Junos OS 24.4.
- JNCIA-DevOps is the prerequisite; the standard specialist voucher is USD 300.
- Five domains: Platform Automation Overview, gRPC, Ansible, Junos Automation Scripts and YANG. Weights are unpublished.
- The numerical passing score is not published; it appears only on your score report, and initial results are provisional.
The One-Glance Exam Snapshot
This page condenses what you need to remember about the Juniper Networks Certified Specialist, Automation and DevOps (JNCIS-DevOps) exam. It is a review sheet, not a replacement for hands-on practice. For the full preparation plan, pair it with the JNCIS-DevOps study guide, and keep the practice test site open for original practice questions.
| Item | What to remember |
|---|---|
| Exam code | JN0-423 (launched October 6, 2025; replaced JN0-422, which retired October 5, 2025) |
| Format | 65 multiple-choice questions, 90 minutes, English |
| Junos version in scope | Junos OS 24.4 |
| Prerequisite | JNCIA-DevOps; recommended training is optional |
| Voucher | USD 300 standard specialist-exam voucher |
| Delivery | Pearson VUE test center or OnVUE (remote) |
| Passing score | Not published; shown on your score report |
| Validity | Three years |
Two facts remain unverified and should not be filled in with guesses: the split between scored and unscored questions, and any aggregate candidate pass rate. The pass rate article explains what can and cannot be said honestly.
Fees, Scheduling and Test-Day Rules
Registration mechanics
Pearson VUE provides both test-center and OnVUE delivery. Current issuer instructions direct candidates to schedule, manage and launch written exams through Alpine CertMetrics using their hpe.com account. The issuer also renamed its certification program the HPE Networking Certification Program on September 15, 2026, so you may see both Juniper and HPE branding during registration. The credential itself is unchanged. No member versus non-member price schedule was identified, so budget for the single USD 300 figure and see the cost breakdown for what else to plan for. Timing questions are covered in the exam dates guide.
Remote-proctoring conditions
- OnVUE requires identity, equipment and room checks before the exam begins.
- Unauthorized books, notes and other reference materials are prohibited.
- The exam is a written multiple-choice assessment. Hands-on labs help you learn but are not part of the verified exam format.
Domain 1: Platform Automation Overview
Platform Automation Overview
This domain frames how automation reaches a Junos device and which mechanism fits which job. The official subjects include management-process (MGD) automation, Terraform, and the Juniper Extension Toolkit (JET) with the JSD service process.
- MGD: the management process behind the CLI and NETCONF-style management. Know how automation interacts with it for configuration and operational data.
- Terraform: declarative, infrastructure-as-code style provisioning. Be able to contrast it with imperative scripting.
- JET and JSD: the service-process path for programmatic access. Know that it is distinct from MGD-based automation.
- Python and PyEZ: the overview also identifies these, so expect them as context for how automation is written.
Questions here tend to ask you to match a goal to a tool or to recognize which process a given automation approach talks to. Build a quick mental table of mechanism, process it uses and typical use case.
Domain 2: gRPC
gRPC for Automation and Telemetry
gRPC and gNMI appear for both automation and telemetry, which makes this one of the more vocabulary-dense domains.
- Protocol buffers: the serialization format; know why it is compact and schema-driven.
- gRPC protocol: how calls are structured and transported.
- gNMI and OpenConfig: the network-management interface and the vendor-neutral models it commonly carries.
- Sensor paths: how you name the data you want streamed.
- gNMIc: the client tool used to interact with gNMI targets.
- TIG stack: Telegraf, InfluxDB and Grafana, the collection, storage and visualization pipeline for telemetry.
Key Takeaway
Keep two mental workflows separate: using gNMI to configure or query a device, and using it to stream telemetry into the TIG stack. Exam stems often hinge on which of the two is being described.
Domain 3: Ansible
Ansible on Junos
This domain covers the Ansible building blocks and the Junos-oriented tooling around them.
- Supported files: know which file types Ansible uses, such as inventory and variable files.
- Playbooks: structure, tasks and how they target Junos devices.
- Vault: protecting sensitive values such as credentials.
- JSNAPy: snapshot-based validation, comparing device state before and after a change.
- Jinja2 templates: generating configuration from variables.
A useful framing: playbooks orchestrate, Jinja2 renders, Vault protects and JSNAPy verifies. If a question describes a pre-change versus post-change comparison, think JSNAPy. If it describes keeping a password out of plain text, think Vault.
Domain 4: Junos Automation Scripts
Commit, Op, Event and SNMP Scripts
The official scope calls for the concepts, benefits and operation of four script types.
- Commit scripts: run during the commit process, enforcing or adjusting configuration.
- Op scripts: run on demand from the CLI, useful for custom operational commands.
- Event scripts: triggered by system events, enabling reactive automation.
- SNMP scripts: tied to SNMP-driven interactions.
| Script type | Trigger idea | Typical purpose |
|---|---|---|
| Commit | Configuration commit | Validate or enforce configuration standards |
| Op | Operator runs it | Custom operational commands and checks |
| Event | A system event occurs | Automated response to conditions |
| SNMP | SNMP interaction | Extending SNMP-based behavior |
Memorize the trigger for each type first. Most scenario questions can be answered by identifying when the script must run.
Domain 5: YANG
YANG Models
YANG is the data-modeling language behind modern programmable interfaces.
- YANG implementation: how models are applied on Junos.
- OpenConfig configuration models: vendor-neutral models versus native ones.
- Syntax: be able to read a module and recognize its structural statements.
- Data types: know the built-in types and how they constrain values.
Because YANG underpins both gNMI paths and OpenConfig, revisit it after studying gRPC. The two domains reinforce each other. A deeper walkthrough of all five areas is in the exam domains guide.
A Domain-by-Domain Study Sequence
Because weights are unknown, the sequence below is built around dependencies rather than guesses about scoring.
Platform Automation Overview and YANG foundations
- Map MGD, Terraform and JET/JSD to their use cases.
- Read basic YANG syntax and data types so later domains make sense.
gRPC, gNMI and telemetry
- Tie protocol buffers, OpenConfig and sensor paths together.
- Trace a telemetry flow from gNMIc through the TIG stack.
Ansible and Junos automation scripts
- Build a playbook with Jinja2 and Vault, then validate with JSNAPy.
- Write a trigger table for commit, op, event and SNMP scripts.
Mixed original practice and weak-spot review
- Take timed sets of original practice questions across all five domains.
- Revisit the domains where wrong answers cluster.
If you want a sense of how demanding this load is, the difficulty guide discusses it qualitatively. Practice only with original questions; recalled live-exam items are off limits, and no practice set here implies official sponsorship.
Renewal, Expiry and Who Hires for This Skill Set
Keeping the credential active
- The certification is active for three years.
- Renew before expiration by passing an eligible examination or by completing a designated instructor-led or On-Demand course.
- For the specialist course route, the listed options are Junos Platform Automation and NetDevOps, or Advanced Junos Platform Automation and NetDevOps. Only one eligible course is required.
- Open Learning does not qualify for this renewal route.
- If the credential expires, you restart at the beginning of the track.
Where the skills apply
The topics on this exam, Ansible-driven change, telemetry pipelines, YANG-modeled interfaces and on-box scripting, map to network automation and NetDevOps roles in service-provider, enterprise and data center environments that run Junos. Hiring demand varies by region and employer, so the jobs overview and the salary guide are better places to explore specifics than any single figure on a cheat sheet. If you are still weighing the investment, the ROI analysis covers that decision.
Version and Scope Traps to Avoid
- Branding confusion: the program is now called the HPE Networking Certification Program, but the credential and its content are the same.
- Score assumptions: never assume a practice-test threshold equals the real cut score.
- Acronym confusion: other credentials elsewhere in the industry use similar names. This sheet concerns only the Juniper Networks specialist certification described above. If you want a plain-language definition, start with what JNCIS-DevOps is.
Frequently Asked Questions
The current exam is JN0-423, which launched on October 6, 2025 and replaced JN0-422. It has 65 multiple-choice questions, a 90-minute time limit and is offered in English, based on Junos OS 24.4.
The standard specialist-exam voucher is USD 300. No separate member or non-member price schedule was identified, so plan around that single figure and confirm at checkout.
The issuer does not publish a numerical passing score. It appears on your score report, and initial passing results are provisional. See the passing score article for how to interpret this.
Yes, JNCIA-DevOps is the prerequisite certification. Recommended training is optional, but associate-level preparation does not replace studying the five specialist domains.
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 count, and an expired credential means restarting the track.