Exam JN0-105 topic 1 question 88 discussion

Answer C In Junos OS, the command rollback 0 is used to revert any uncommitted changes in the candidate configuration, returning the configuration to its state before the uncommitted changes were made. Since the incorrect IP address (172.16.101.1/24) was added but not yet committed, issuing rollback 0 will discard this change, allowing you to re-enter the correct IP address (172.16.100.1/24) without saving the incorrect configuration. B. rollback 1: This command reverts the configuration to the last committed configuration. However, if the IP change was made in the current candidate configuration and not yet committed, rollback 1 would not apply here. Config was not committed !!!

If you've committed a configuration and then need to revert to the previous configuration, the rollback command is used. Since the incorrect IP address has not been committed, as indicated by the commit check command being successful, issuing rollback 1 will undo the changes made in the current session, which includes the accidental entry of the IP address.

C - config was not committed

It's C

C. it was not commited, it is only "commit CHECK", so rollback 0 is sufficient to discard the config

B, the config was committed.