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When selecting a site for the most important information systems components, one major objective is to limit the risk of exposure from internal and external sources. The selection process should include a review of the surrounding area to determine if it is relatively safe from exposure to fire, flood, explosion, or similar environmental hazards. Outside intruders can be deterred through the use of guards, fences, barriers, surveillance equipment, or other similar devices. Since access to key information system hardware and software should be limited, doors and windows must be secure. Additionally, the location should not be identified or advertised by signage or other indicators.
Detection devices, where applicable, should be utilized to prevent theft and safeguard the equipment. They should provide continuous coverage. Detection devices have two purposes- to alarm when a response is necessary and to support subsequent forensics. The alarm capability is useful only when a response will occur.
Some intruder detection devices available include
Risks from environmental threats can be addressed through devices such as halon gas and halon replacements, smoke alarms, raised flooring, and heat sensors.
Physical security devices frequently need preventive maintenance to function properly. Maintenance logs are one control the institution can use to determine whether the devices are appropriately maintained. Periodic testing of the devices provides assurance that they are operating correctly.
Security guards should be properly instructed about their duties. The employees who acces secured areas should have proper identification and authorization to enter the area. All visitors should sign in and wear proper IDs so that they can be identified easily. Security guards should be trained to restrict the removal of assets from the premises and to record the identity of anyone removing assets. Consideration should be given to implementing a specific and formal authorization process for the removal of hardware and software from premises.
The following security zones should have access restricted to a need basis: