IJOS - Introduction to the Junos Operating System

IJOS - Introduction to the Junos Operating System

Length : 3 days

This three-day course provides students with the foundational knowledge required to work with the Juniper Networks Junos operating system and to configure Junos devices. The course provides a brief overview of the Junos device families and discusses the key architectural components of the software. Key topics include user interface options with a heavy focus on the command-line interface (CLI), configuration tasks typically associated with the initial setup of devices, interface configuration basics with configuration examples, secondary system configuration, and the basics of operational monitoring and maintenance of Junos devices.

The course then delves into foundational routing knowledge and configuration examples including general routing concepts, routing policy, and firewall filters.

After successfully completing this course, you should be able to:

  • Describe the basic design architecture of the Juniper Networks Junos OS.
  • Identify and provide a brief overview of Junos devices.
  • Navigate within the Junos CLI.
  • Perform tasks within the CLI operational and configuration modes.
  • Restore a Junos device to its factory-default state.
  • Perform initial configuration tasks.
  • Configure and monitor network interfaces.
  • Describe user configuration and authentication options.
  • Perform secondary configuration tasks for features and services such as system logging (syslog) and tracing, Network Time Protocol (NTP), configuration archival, and SNMP.
  • Monitor basic operation for the Junos OS and devices.
  • Identify and use network utilities.
  • Upgrade the Junos OS.
  • Perform file system maintenance and password recovery on a Junos device.
  • Navigate within the Junos J-Web interface.
  • Explain basic routing operations and concepts.
  • View and describe routing and forwarding tables.
  • Configure and monitor static routing.
  • Configure and monitor OSPF.
  • Describe the framework for routing policy and firewall filters.
  • Explain the evaluation of routing policy and firewall filters.
  • Identify instances where you might use routing policy.
  • Write and apply a routing policy.
  • Identify instances where you might use firewall filters.
  • Write and apply a firewall filter.
  • Describe the operation and configuration for unicast reverse path forwarding (RPF).


Students should have basic networking knowledge and an understanding of the Open Systems Interconnection (OSI) reference model and the TCP/IP protocol suite.

Course outline

Day 1

Chapter 1: Course Introduction

Chapter 2: Junos Operating System Fundamentals
The Junos OS
Traffic Processing
Platforms Running the Junos OS

Chapter 3: User Interface Options – The Junos CLI
User Interface Options
The Junos CLI: CLI Basics
The Junos CLI: Operational Mode
The Junos CLI: Configuration Mode

Chapter 4: User Interface Options – The J-Web Interface
The J-Web GUI
Lab 1: The Junos CLI

Chapter 5: Initial Configuration
Factory-Default Configuration
Initial Configuration
Interface Configuration

Lab 2: Initial System Configuration

Day 2

Chapter 6: Secondary System Configuration
User Configuration and Authentication
System Logging and Tracing
Network Time Protocol
Archiving Configurations

Lab 3: Secondary System Configuration

Chapter 7: Operational Monitoring and Maintenance
Monitoring Platform and Interface Operation
Network Utilities
Maintaining the Junos OS
Password Recovery
System Clean-up

Lab 4: Operational Monitoring and Maintenance

Chapter 8: Interface Configuration Examples
Review of the Interface Configuration Hierarchy
Interface Configuration Examples
Using Configuration Groups

Chapter 9: Routing Fundamentals
Routing Concepts: Overview of Routing
Routing Concepts: The Routing Table
Routing Concepts: Routing Instances
Static Routing
Dynamic Routing

Lab 5: Routing Fundamentals

Day 3

Chapter 10: Routing Policy
Routing Policy Overview
Case Study: Routing Policy

Lab 6: Routing Policy

Chapter 11: Firewall Filters.
Firewall Filters Overview
Case Study: Firewall Filters
Unicast Reverse-Path-Forwarding Checks

Lab 7: Firewall Filters

Chapter 12: Class of Service
CoS Overview
Traffic Classification
Traffic Queueing
Traffic Scheduling
Case Study: CoS

Lab 8: Class of Service

Chapter 13: JTAC Procedures
Opening a Support Case
Customer Support Tools
Transferring Files to JTACT

Chapter 14: Juniper Security Concepts
Security Challenges
Juniper’s Security Focus

Appendix A: IPv6 Fundamentals
IPv6 Addressing
Protocols and Services

Class Dates:


Mar 11, 2019 - Mar 13, 2019

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Mar 25, 2019 - Mar 27, 2019

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Apr 22, 2019 - Apr 24, 2019

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May 20, 2019 - May 22, 2019

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Jun 3, 2019 - Jun 5, 2019

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On Site Class Available

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