…and in particular, often goes very badly. not only in life in general, but in the IT world also :)
you probably have dozens of stories to tell, if not hundreds. someone configured the port badly, everything worked until it stopped … and when it stopped, it dragged the whole network behind. big time. whole data center.
why do we make the same mistakes all the time? automation slightly improves the situation, but sometimes it also dramatically only makes the situation worse.
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