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Exam Information
Official specifications published by Juniper
Exam Format
90 min
65
Variable (approximately 60-70%)
Specialist
Registration
$300 USD
Pearson VUE or online proctoring
English
Validity
3 years
Pass the current version of the JNCIS-DevOps exam before expiration; Pass a higher-level exam in any track (JNCIP or JNCIE); Complete 30 Continuing Education credits
JN0-423 Exam Topics and Domains
JN0-423 is organized into 5 weighted domains. Expect to work with gRPC, gNMI, OpenConfig, Ansible, and more.
1
Platform Automation Overview
20%
Management Process (MGD-based) Automation
MGD Architecture and APIs
- Understand the role of MGD in Junos automation
- Identify automation tools that interact with MGD
Terraform
Terraform for Junos
- Describe how Terraform is used for Junos automation
- Understand IaC principles in network automation
Juniper Extension Toolkit (JECT) Service Process (JSD-based) Automation
JSD Architecture and Applications
- Identify the concepts and features of JECT
- Understand JSD-based automation use cases
2
gRPC
20%
gRPC/gNMI for Automating Junos
Protocol Buffers (Proto buff)gRPC ProtocolOpenConfig for Configuration
- Describe gRPC protocol and its components
- Explain how gNMI is used for Junos configuration management
- Understand OpenConfig data models
gRPC/gNMI for Junos Telemetry
Telemetry with Protocol BuffersgRPC Protocol for Telemetry StreamingOpenConfig for TelemetrySensor PathsTools (gNMIc, TIG Stack)
- Describe gRPC/gNMI telemetry architecture
- Understand sensor paths and their usage
- Explain the TIG stack for telemetry collection and visualization
3
Ansible
20%
Ansible Fundamentals for Junos
Supported FilesPlaybooksVaultJSNAPyTemplates (Jinja2)
- Understand Ansible architecture and components
- Write playbooks for Junos automation tasks
- Use Ansible Vault for secure credential management
- Implement JSNAPy for change validation
- Create Jinja2 templates for dynamic configurations
4
Junos Automation Scripts
20%
Commit Scripts
Commit Script Concepts and Operation
- Understand commit script execution model
- Describe use cases for commit scripts (validation, expansion, enforcement)
Op Scripts
Op Script Concepts and Operation
- Describe op script capabilities and use cases
- Understand how to create custom operational commands
Event Scripts
Event Script Concepts and Operation
- Understand event-driven automation concepts
- Configure event policies for automated responses
SNMP Scripts
SNMP Script Concepts and Operation
- Describe SNMP script capabilities
- Understand how to extend SNMP functionality
5
YANG
20%
YANG Fundamentals
Implementation Concepts
- Understand YANG as a data modeling language
- Describe the role of YANG in model-driven configuration
OpenConfig
OpenConfig Models
- Describe OpenConfig initiative and its models
- Understand the use of OpenConfig for vendor-neutral automation
YANG Syntax and Data Types
YANG Language Constructs
- Understand YANG syntax and structure
- Identify YANG data types and constraints
How do I earn this certification?
Passing JN0-423 earns the JNCIS-DevOps certification. It sits in the Automation and DevOps track.
Current Level Exams
- JN0-363 - JNCIS-SP (Service Provider Routing and Switching, Specialist)
- JN0-348 - JNCIS-ENT (Enterprise Routing and Switching, Specialist)
- JN0-335 - JNCIS-SEC (Security, Specialist)
Next Level Options
- JNCIP-DevOps - Automation and DevOps, Professional
- JNCIE Lab - Expert-level lab exam
Alternative Paths
- JN0-348 - JNCIS-ENT Complementary skills for enterprise network automation
- JN0-363 - JNCIS-SPAutomation skills applicable to service provider networks
- JN0-335 - JNCIS-SEC Security automation and DevSecOps applications
- JN0-231 - JNCIA-MistAI AI-driven network automation and management
Practice with Precision
The PlanetCert Simulator mirrors the real exam environment with authentic questions and timed pressure.
How to study for this exam?
The most effective way to prepare for JN0-423 is by using the PlanetCert Simulator to practice questions and review detailed explanations.
What's changed on this exam?
Current Status
- ACTIVE
- Last content update: 2024
Updates
- Ansible for Junos Latest module features and best practices reflected in exam
- gRPC/gNMI Significant portion of exam dedicated to gRPC concepts
- YANG Models Understanding YANG syntax and OpenConfig structure is critical
- Terraform Terraform basics now included in exam objectives
Who should take this exam?
This exam is typically taken by Network engineers implementing automation solutions and DevOps engineers working with Juniper networks.
- JNCIA-DevOps certification (JN0-223 or JN0-224)
- Intermediate knowledge of automation tools and best practices
- Familiarity with scripting languages (Python, SLAX, XSLT)
- Understanding of Junos OS configuration and operation