4- Environmental Security Flashcards
Electrical power vulnerabilities
Computer systems require a steady diet of clean electric power.
Power related events/threats that may damage computers and network equipment
- Spike or surge
- Inrush
- Noise
- Dropout
- Brownout
- Blackout
Spike or surge
A sharp increase in voltage that lasts for only a fraction of a second.
Inrush
A sudden increase in current flowing to a device, usually associated with the startup of a large motor.
Noise
The presence of other electromagnetic signals within incoming power.
Dropout
A momentary loss of power that lasts from a few milliseconds to a few seconds.
Brownout
A sustained drop in voltage that can last from several seconds to several hours.
Blackout
A complete loss of electric power for more than a few seconds.
Environmental conditions that affect computer and network equipment
- Temperature
- Humidity
- Dust and dirt
- Smoke and Fire
- Sudden unexpected movement - earthquake
Room temperature and humidity control for computer and network equipment
The temperature in rooms containing computer and network equipment should range from 68° to 75°F, and humidity should range from 40 to 55 percent.
N+1 design
means that there should be at least one additional HVAC system than is required to continuously cool the facility.
Wet pipe fire suppression
In this type of system, all sprinkler pipes are filled with water. Each sprinkler head is equipped with a fuse—a heat-sensitive glass bulb—that breaks upon reaching a preset temperature.
dry pipe fire suppression
In this type of system, pipes are filled with compressed air. This type of system is used where ambient temperatures often drop below freezing.
Pr-action fire suppression
A pre-action system is essentially a dry pipe system until a “preceding” event, such as a smoke detector alarm, occurs; at this time, the system is filled with water and essentially converted in real time to a wet pipe system.
This type of system is used in areas with high-value contents such as data centers.
Deluge fire suppression
This type of system has dry pipes and all of the sprinkler heads are open. When the system is operated (for instance, when an alarm is triggered), water flows into the pipes and out of all of the sprinkler heads.
