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單項選擇題

You've configured an interface with an IP address and commited the change. You then commited 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?()

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

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