The JUNOS software command line interface (CLI) has many built-in tools to guide you while you master its commands and structure. If you already know Cisco’s IOS command language, you can anticipate many of the JUNOS software commands. JUNOS software and IOS have two fundamental differences:
JUNOS software organizes commands in a structured hierarchy as opposed to a flat file, showing the configuration and commands of each level within its own set of curly braces {}.
JUNOS software stores changes into a candidate configuration instead of immediately impacting your active configuration file. You don’t affect the active configuration until you commit the changes.
Because JUNOS doesn’t use the ip keyword in the commands, many of the show commands you already know work if you simply drop the keyword. For example, show ip route becomes show route.
