Which two commands allow you to return to a previous version of software on the device? (Choose two.)
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A. B. C. D.AD
The two commands that allow you to return to a previous version of software on a device are:
request system software rollback
request system software replace
request system software rollback:
The "request system software rollback" command allows you to revert back to a previous software version on a Junos device. When you execute this command, the device will reboot and load the previous version of software from the /altroot partition.
You can use the following syntax to execute this command:
request system software rollback
You can also specify the version number of the software that you want to roll back to, as shown below:
request system software rollback slice <RE version number>
The "request system software replace" command allows you to replace the current version of software with a new version. This command installs the new software version and reboots the device to load the new version.
You can use the following syntax to execute this command:
request system software replace <package-name>
Note that you must have the new software package stored on the device or accessible via FTP or HTTP in order to execute this command.
Overall, both of these commands are useful for managing software versions on Junos devices and allowing administrators to quickly roll back to a previous version if necessary.