JNCIA-Junos: Juniper Networks Certified Associate – Junos (legacy) — Question 36

You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router.
How do you undo all these changes?

Answer options

• A. rollback 2
• B. rollback 1
• C. rollback 0
• D. rollback 3

Correct answer: A

Explanation

The correct answer is A, as 'rollback 2' will revert the configuration back to the state before both changes were made. 'Rollback 1' would only undo the last change made to the firewall filter, not the IP address configuration. 'Rollback 0' would not revert any changes, and 'rollback 3' exceeds the number of changes made, resulting in an error.