JN0-423 Automation and DevOps, Specialist (JNCIS-DevOps) exam
Proctored multiple-choice knowledge exam mapped to the published Juniper objectives and the current software scope named on the official page.
- Type
- Written
- Delivery
- Both
- Duration
- 90 min
- Questions
- 65
Exam sections
Platform Automation Overview
In this part of the assessment, candidates work with Identify concepts, general features, or functionality of Junos platform automation Management process (MGD-based) automation Terraform Juniper Extension Toolkit (JECT) service process (JSD-based) automation. The emphasis is on usable understanding: selecting, explaining, implementing, or troubleshooting the relevant Junos automation behavior in context. For JNCIS-DevOps, the practical connection to gRPC is especially worth tracing.
Question notes
Where several answers seem reasonable, use provider-recommended behavior, explicit requirements, and the least disruptive complete solution to distinguish the strongest response. This distinction matters specifically to Automation and DevOps, Specialist (JNCIS-DevOps) exam and its role-focused assessment boundary.
Preparation tips
Translate every published subtopic in Platform Automation Overview into an action: configure it, locate it, analyze its output, or explain its effect. Revisit any item that you can define but cannot apply. Compare your explanation with the provider's terminology before treating the topic as complete.
gRPC
Within Automation and DevOps, Specialist (JNCIS-DevOps) exam, gRPC addresses Describe how to use gRPC/gNMI for automating Junos: Proto buff gRPC protocol OpenConfig Describe how to use gRPC/gNMI for Junos telemetry: Proto buff gRPC protocol OpenConfig Sensor paths Tools (gNMIc, TIG stack). This scope asks candidates to connect product behavior with requirements and to recognize the evidence that separates a healthy outcome from a plausible-looking mistake. The expected depth is the depth needed to support automation and devops design, implementation, operations, and troubleshooting, not merely define the listed terms.
Question notes
Where several answers seem reasonable, use provider-recommended behavior, explicit requirements, and the least disruptive complete solution to distinguish the strongest response. The strongest answer should remain consistent with the wider goal of automation and devops design, implementation, operations, and troubleshooting.
Preparation tips
Connect gRPC to a real project or reference architecture. Identify where the official subtopics appear, which assumptions the design makes, and what would change under a different scale or risk profile. Record one concrete example you could discuss in an interview for JNCIS-DevOps.
Ansible
This domain covers Describe how to use Ansible for automating Junos OS devices and networks: Supported files Play books Vault JSNAPy Templates (Jinja2). A prepared candidate can move beyond definitions and reason about dependencies, recommended patterns, operational risks, and likely outcomes connected to Ansible. The expected depth is the depth needed to support automation and devops design, implementation, operations, and troubleshooting, not merely define the listed terms.
Question notes
Some prompts begin with an observed result and ask for the most likely cause or next action. Practice separating evidence from assumptions before selecting an answer about Ansible. Cross-check the proposed answer against dependencies that connect Ansible with Junos Automation Scripts.
Preparation tips
Use the official outline to design several decision scenarios for Ansible. For each one, state the requirement, reject at least one tempting alternative, and justify the final approach in product-specific terms. Finish by checking the result against every official subtopic grouped under Ansible.
Junos Automation Scripts
Junos Automation Scripts brings together Describe the concepts, benefits, or operation of automation scripts for Junos OS devices and networks: Commit scripts Op scripts Event scripts SNMP scripts. The section matters because it tests whether candidates can translate official product knowledge into defensible choices for realistic automation and devops design, implementation, operations, and troubleshooting scenarios. Its place in JNCIS-DevOps becomes clearer when candidates follow inputs and outcomes into YANG.
Question notes
Where several answers seem reasonable, use provider-recommended behavior, explicit requirements, and the least disruptive complete solution to distinguish the strongest response. When context is ambiguous, prefer the interpretation that fits Junos automation guidance and the stated scenario outcome.
Preparation tips
Connect Junos Automation Scripts to a real project or reference architecture. Identify where the official subtopics appear, which assumptions the design makes, and what would change under a different scale or risk profile. Finish by checking the result against every official subtopic grouped under Junos Automation Scripts.
YANG
The official outline places Identify the concepts and general features of managing configuration in Junos devices and networks using Yet Another Next Generation (YANG) models: Implementation concepts OpenConfig YANG syntax and data types within YANG. Candidates need to understand how the pieces relate, when each one is relevant, and what a sound result looks like in the context of Junos automation. The domain is most useful when studied as part of the complete JNCIS-DevOps workflow.
Question notes
The domain can appear through direct knowledge checks as well as short operational or design scenarios; pay close attention to scope, constraints, and the action verb in each prompt. Use the official YANG subtopics to judge how deep the expected reasoning should go.
Preparation tips
Explain YANG aloud as if handing an environment to a colleague. Include purpose, prerequisites, normal workflow, expected evidence, common misconfiguration, and a safe first troubleshooting step. Then connect the exercise to Platform Automation Overview so preparation covers the handoff between domains.