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The Juniper JN0-421 exam measures the candidates' abilities to install, configure, and troubleshoot Junos automation and DevOps-related technologies that are used in the Junos space. It also evaluates their knowledge on automation tools and their ability to use automation languages to develop and maintain automation scripts. JN0-421 exam also deals with the deployment of DevOps practices, including continuous integration and delivery (CI/CD), and the use of automation frameworks in managing network infrastructure.

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To pass the Juniper JN0-421 certification exam, candidates must have a comprehensive understanding of Juniper platforms and automation tools. They must also be able to design and implement automation solutions in a Juniper environment. Candidates can prepare for the exam by taking training courses, attending workshops, and using study materials such as books and practice exams. Juniper also offers a variety of resources such as study guides, practice exams, and community forums to help candidates prepare for the exam.

Reference: https://www.juniper.net/us/en/training/certification/certification-tracks/devops?tab=jncis-devops

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Juniper JN0-421 Exam Syllabus Topics:

SectionObjectives
Topic 1: Python Automation- Python Tools for Junos Automation
  • 1. PyEZ exception handling
  • 2. Jinja2 templates
  • 3. JSNAPy
  • 4. RPCs
  • 5. PyEZ
  • 6. REST integration
Topic 2: NETCONF and XML API- Automation Access Methods
  • 1. NETCONF
  • 2. XML API
  • 3. REST API
Topic 3: Automation Frameworks- Ansible for Junos Automation
  • 1. Jinja2 templates
  • 2. Ansible Tower
  • 3. Playbooks
- Salt for Junos Automation
  • 1. Runner
  • 2. Pillar
Topic 4: YANG and OpenConfig- Data Modeling and Open Standards
  • 1. YANG models
  • 2. OpenConfig
  • 3. Junos implementation concepts
Topic 5: Junos Automation Scripts- Automation Script Concepts
  • 1. Translation scripts
  • 2. Python scripting
  • 3. Operational scripts
  • 4. SLAX scripting
  • 5. Commit scripts
  • 6. Event scripts
  • 7. SNMP scripts
Topic 6: Platform Automation Overview- Junos Platform Automation Concepts
  • 1. Telemetry concepts (gRPC, gNMI, native telemetry)
  • 2. JSD-based automation
  • 3. MGD-based automation
Topic 7: Data Serialization and Templating- Serialization Formats and Templates
  • 1. JSON
  • 2. XML
  • 3. Jinja2
  • 4. YAML

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