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Question Can I install Application package versions on top of Junos OS Releases? Answer You cannot install Application package version 14.1X54-A1 on top of Junos OS Release 14.1X53-D10. Releases 14.1X53 and 14.1X54 are two distinct major releases of Junos OS
Juniper Networks EX Series switches are shipped with the Juniper Networks Junos operating system (Junos OS) installed. Junos OS provides the following primary user interfaces which you can use to access, configure, and manage your EX Series switch: Juniper Web Device Manager (J-Web) GUI Junos OS CLI The J-Web distribution model was introduced on EX Series switches for Junos OS Release 14.1X53-D10
Manual update feature - You also have the option of checking for the availability of the latest Application package at the Juniper Networks’ download website ( Downloads ) and installing an available update on your switch by using the J-Web interface or CLI
Which version of Python is supported on Junos OS? Python 2.7.8. From which Junos OS version is Python automation supported?...SLAX will continue to be in Junos OS going forward and will be supported
Junos PyEZ is a Python micro-framework designed to provide the same capabilities as a user would have on the Junos OS CLI in an environment built for automation
Feature A configlet is a configuration template that is transformed to a CLI configuration string before being applied to a device...These variables act as an input to the process of transformation, to construct the CLI configuration string
Program Your Network with Junos OS Junos OS is the very first network operating system to be programmable from the start...You can then run those applications on a device running Junos OS...Extend the Junos UI (CLI and MIBs)
Junos PyEZ Features and Architecture Junos PyEZ is a Python "micro-framework" used to remotely manage or automate Junos OS devices. The user is NOT required to be a software programmer, have sophisticated knowledge of Junos OS, or have a complex understanding of the Junos OS XML API
From the Junos OS CLI, operational data is displayed using show commands, for example, show ospf neighbor
Answer As far as whether or not you can update a virus definition file, I am not familiar with the process to do that in devices running Junos OS, but if it is something that can be accomplished through CLI commands, rather than through shell, then it should be possible to do it from a script as well