Physical and Environmental Security Flashcards
Brownout
A reduction of voltage by the utility company for a prolonged period of time.
Electrical circuits
Used to detect open windows or doors- many work on magnetic switches that close the electrical circuit when the window is opened and moves the magnet away from the electrical switch.
Electronic discharge
A power surge generated by a person or device contacting another device and transferring a high voltage shock.
Infrared/ night vision lighting
Can assist in low-light conditions and augment closed circuit TV cameras to monitor an area at night.
In-Rush current
The initial surge of current experienced when power supply resumes after failure. This can damage equipment or cause breakers to trip/ fail.
Interference (noise)
A natural occurrence that happens when unwanted signals are generated in circuits that are in close proximity.
Lock bumping
Involves cutting a key to the maximum depth on all cuts and hammering the key with a “Tomahawk” (a flexible hammer) to transfer maximum force to all of the pins so that they jump into the open position.
Microwave
Receiver diode picks up transmitted and “bounced” energy waves in an enclosure. Intruder disrupts the waves and activates the alarm.
Motion sensors
Most work on Passive Infrared technology. Various types may autodial an emergency number, sound an alarm, or trigger lights when they sense motion.
Network Access Control (NAC)
Basic functions include validating software and release levels (Firewall, Antivirus, Anti-Spam, etc.) and providing login security to the device and the network.
Passive infrared
Objects radiate infrared with the heat of their bodies. Detector notes the change and triggers an alarm.
Pressure/ motion sensitive
Use of buried fiber and pressure plates to detect vehicles and persons traveling close to the buries cable.
Sounds and vibration
Microphones and other monitoring equipment are used to detect changes in sound or listen in to a facility.
Photoelectric
Active infrared beam that triggers an alarm when the beam is broken.
Sag/ Dip
A short period of low voltage.
