JN0-102 · Question #218
Which two commands allow you to return to a previous version of software on the device? (Choose two.)
The correct answer is A. request system software add D. request system software rollback. This question identifies two Junos OS commands that facilitate reverting to a previously installed software version or installing an older version.
Question
Which two commands allow you to return to a previous version of software on the device? (Choose two.)
Options
- Arequest system software add
- Brequest system software downgrade
- Crequest system software replace
- Drequest system software rollback
How the community answered
(47 responses)- A89% (42)
- B4% (2)
- C6% (3)
Why each option
This question identifies two Junos OS commands that facilitate reverting to a previously installed software version or installing an older version.
The `request system software add` command can be used to install an older Junos OS image, effectively downgrading the software to a previous version. This requires specifying the path to the desired older software package.
`request system software downgrade` is not a valid Junos OS command.
`request system software replace` is not a valid Junos OS command for software management.
The `request system software rollback` command allows the device to revert to the previously installed Junos OS image, which is automatically saved during an upgrade. This is a quick way to go back one version if an issue arises with the new software.
Concept tested: Junos OS software rollback and downgrade
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-install-upgrade/topics/ref/command/request-system-software-rollback.html
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