Many outages are caused not by hardware failure but by changes: a mistyped command, an untested upgrade, a firewall rule added in a hurry. Change management and configuration management are the processes that keep changes controlled and configurations known and recoverable. They are sometimes seen as paperwork, but their real purpose is fewer surprises, faster recovery, and a clear record of what changed when something breaks. Network+ tests the steps of the change process and the vocabulary of baselines, golden configurations and backups.
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