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Physical security refers to the actual availability of getting at the equipment. This is managed by using locks and other barriers which require authentication, such as a proximity card, retinal scanner, etc. For physical security the authentication techniques must be put at the site of the equipment, such as the telecommunications closet, wiring closet, server room, and so forth. An attacker would have to be in the vicinity to try and attack the equipment.

System security has to require authentication and present barriers to those from remote locations, through the network connections, web applications, and so on. Attackers in that case would not need to be in the area to try and cause problems.

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