Introduction to Juniper

Introduction to Juniper

The Juniper Introduction series, available on YouTube, is a great way to learn Juniper’s network philosophy.

Many of us are familiar with networking in general, but perhaps we haven’t used Juniper’s platforms before. I learned on Cisco equipment and found it a bit intimidating to move to Juniper.

But it is possible! As long as you have some networking experience, you can use this course to go from never having seen Juniper devices, to becoming a Juniper specialist.

You could even pass the JNCIA Junos exam if you want!

Most videos include optional extras to help you to test your understanding. These include quizzes, labs, study notes, transcripts, and flashcards.

The video series is free to all. The extra content is an inexpensive bonus for Patreon subscribers.

Juniper Platforms | Introduction to Juniper and JNCIA Part 11

Additional Resources

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Study Notes

CLI Introduction

CLI Introduction  Quiz Page: Lab Page: Notes All Juniper devices run the Junos operating system. Like any network operating system, this includes a CLI (SSH, Telnet), web interface, and automation options. Junos is based on either FreeBSD, or a customised version of Linux, depending on the Junos version. The Junos CLU has two modes; Operational,...

VLANs and Interfaces

VLANs and Interfaces  Quiz Page: Lab Page: Notes There are several acronyms for interface types and components: IFD - Interface Physical Device IFL - Interface Logical Device IFF - Address Family IFA - Address Entry Common interface names are: ge - Gigabit ethernet xe - 10G ethernet et - 100G ethernet ae - aggregated...


DHCP  Quiz Page: Lab Page: Notes There are two ways of configuring DHCP; Legacy and extended. Both of these methods are valid. Legacy was created in an older version of Junos, while extended was updated to match across multiple platforms. DHCP requires an active interface in the VLAN that addresses are being sent to...

Active and Candidate

Active and Candidate  Quiz: Labs: Notes Unlike some vendors, Juniper changes are not applied immediately. They need to be committed first. The 'active' configuration is the configuration that's running right now. The candidate config is a copy of the active that we're making changes to. This overwrites the active configuration when it's committed. Candidate...

Configuration Rollback

Configuration Rollback  Quiz: Labs: Notes It can sometimes be risky making changes, as mistakes can kick us out of the device. If we use commit confirmed, we can automatically roll back if we don't confirm the changes. Changes are confirmed by running another commit. The default time before rollback is 10 minutes, but this can...

Configuration Groups

Configuration Groups  Quiz: Labs: Notes Configuration groups are reusable blocks of configuration that can be applied multiple times. This makes it similar to a template. The contents of a configuration group are just normal configuration items. However, it does support regex, so sometimes it may look different. When a configuration group is applied, it...


Authentication  Quiz: Labs: Notes Users can be created locally on a Junos device. Each user must have a password set. This may be done with the plain-text-password keyword. This can be misleading. This does not mean the password is stored in plain text. It means that you're about to enter the password in plain text....

A New Device

A New Device   Quiz: Labs: Notes Like most good networking equipment, we can connect a console cable to any Juniper device. This can be a traditional serial console cable or a USB console cable. Sometimes the root password is lost, and needs to be recovered. To do this: Reboot the switch Interrupt boot...


Platforms  Notes Juniper's routing platforms: M-Series was the original router (no longer available) T-Series was next, also old now J-Series was the branch router, also old MX series - The current router platform Designed for the edge Virtual (vMX) available ACX - Environmentally hardened routers PTX - High-speed routers 'Packet Transport Routers' Aimed at...