In the early days of computing (circa 1960-1970), the physical security of computers and their resources were not nearly as difficult as they are now in modern times. This is due to the large size of those computers which comprised mostly of mainframes secured away in server rooms and the fact that a limited number of individuals knew what to do with them.
In present day, most computers are compact enough to sit on desks in every company around the world. Also, access to devices and other resources is distributed throughout the environment. Organizations now have server rooms and remote mobile users that take computers out of the company facility. "Properly protecting these computer systems, networks, facilities, and employees has become an overwhelming task to many companies." -CISSP: All In One Exam Guide
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