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A company giving training to its employees to lock the doors behind them when in datacentre is MOST likely trying to prevent what type of attack:
Piggybacking
Dumpster diving
Tailgating
Shoulder surfing
Tailgating is when some unauthorized person would quickly follow an authorized person. ***ADDED: The difference between piggybacking and tailgating is that a piggybacker would have a consent of an authorized person allowing him the access, while a tailgater simply enters the premises.
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