Having some Juniper JunOS skills is a plus for many networking personnel, even if you don’t work daily on Juniper gear, it is very interesting to learn and compare with Cisco IOS for instance. At the end of the day it will help you understand more about network operating systems and broaden your view.
Juniper makes it easy for you to study their software by providing free material (after registration). Juniper’s documentation is usually easier to read and to understand than Cisco documentation.
If you want to validate your knowledge of JunOS, you can pass the JNCIA-Junos certification that is Juniper’s entry-level certification. It is quite easy to pass if you are serious about it and read their documentation. For certified professionals (Cisco or other), preparing for this certification should take you from a few (dedicated) hours to 1 or 2 days at most. This certification is valid for 2 years and is comparatively cheaper than other certs.
Exam objectives are:
- Junos OS Fundamentals
- User Interface Options
- Junos Configuration Basics
- Operational Monitoring and Maintenance
- Routing Fundamentals
- Routing Policy and Firewall Filters
- Class of Service
- Networking Fundamentals
See, nothing really to fear. While you could pass this certification by only reading Juniper’s docs, it is always much better to really understand and practice what you learn! This will define the difference between you and others.
We agree that you may be not have access to Juniper routers, this is where GNS3 enters. You can practice everything on your computer! And to make things even easier, we have made some practice exercises for you. In fact, the hardest part is that you must get your own JunOS olive image. You can create one by reading this how to (which needs to be updated and should be soon, sorry!). After creating, add your image in GNS3 and you are ready to play with JunOS.
The practice exercises are directly related to the two Juniper documentation PDFs provided on their website for the certification. To access these PDFs; go on the fast track portal, then click ”Review Study Resources”. You will have to register first (this is free) before accessing the section.
There you will find 2 PDFs:
- JNCIA-Junos Study Guide—Part 1
- JNCIA-Junos Study Guide—Part 2
Part 1 is the introduction to JunOS, talking about operating system fundamentals, user interface options, initial and secondary configurations and operational monitoring and maintenance. Much of it is really easy to learn.
Part 2 is a bit more advanced but shorter. It is about routing fundamentals, routing policy and firewall filters, class of service (QoS).
Once you read chapter 1 of the first PDF, you can start with Operating System Fundamentals