A mantrap is a security device that consists of a small space with two sets of interlocking doors, such that the first set of doors must close before the second one opens. A mantrap can be used to control access to a data center by verifying the identity and weight of the person entering. A bollard is a sturdy post that prevents vehicles from entering a restricted area. Geofencing is a technology that uses GPS or RFID to create a virtual boundary around a location and trigger an action when a device crosses it. RFID is a technology that uses radio waves to identify and track objects or people. References:
* https://www.techopedia.com/definition/16293/mantrap
* https://www.techopedia.com/definition/1437/bollard
* https://www.techopedia.com/definition/23961/geofencing
* https://www.techopedia.com/definition/506/radio-frequency-identification-rfid