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Configuration drift
A device's running config moving away from its intended one, usually through changes made by hand.
A change typed on one router, never written down, makes it differ from the others and from the record. With the
intended config in files, a dry run (Ansible's --check --diff) compares each device with it and shows the
difference line by line, without changing anything; a normal run puts the device back. Comparing with a baseline
(the known good config) on a schedule turns this into drift detection.