Friday, 15 July 2011

CISSP CBK 5 Physical Security

Physical Security

Crime Prevention Through Environmental Design (CPTED) is a discipline that outlines how the proper design of a physical environment can reduce crime by directly affecting human behavior

Soda acid removes fuel from the fire by discharging a thick form that moves the fire away from the fuel supply.
Carbon dioxide removes oxygen from the fire.
Water reduces fire temperature.
Halon (gas) or its substitutes interferes with the chemical reactions between elements in the fire.
clapper valve hold the water back in Dray pipe

Auxiliary station alarms automatically cause an alarm originating in a data center to be transmitted over the local municipal fire or police alarm circuits for relaying to both the local police/fire station and the appropriate headquarters
auditing is a technical control auditing as a audit logs

static charge of 1500 volts is able to cause disk drive data loss.
A charge of 1000 volts is likely to scramble monitor display and a charge of 2000 volts can cause a system shutdown.
It should be noted that charges of up to 20,000 volts or more are possible under conditions of very low humidity with non-static-free carpeting.

The preaction system combines both the dry and wet pipe systems,is most recommended in Comms room . though it is WATER point to remember.

The organization may also have to comply with requirements of the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA)

Tempered glass heating and immediately cooling it 6 to 7 times stronger
Acrylic glass can be made out of polycarbonate acrylic, which is stronger than
standard glass but produces toxic fumes if burned.
The strongest window material is glass-clad polycarbonate good for wide range like
fire chemical and breakage.

passive relocking function, it can detect when someone attempts to tamper with it,
in which case extra internal bolts will fall into place to ensure it cannot be compromised.

Common-mode noise is electrical noise between the hot and ground wire and between
the neutral and ground wire

If a safe has a thermal relocking function, when a certain temperature is met (possibly from drilling), an extra lock is implemented to ensure the valuables are properly protected.

Capacitance detectors monitor an electrical field surrounding the object being monitored. They are used for spot protection within a few inches of the object, rather than for overall room security monitoring used by wave detectors.

The focal length value relates to the angle of view that can be achieved. Short focal length lenses provide wider-angle views, while long focal length lenses provide a narrower view. The size of the images shown on a monitor, along with the area covered by one camera, is defined by the focal length. For example, if a company implements a CCTV camera in a warehouse, the focal length lens values should be between 2.8 and 4.3 millimeters (mm) so the whole area can be captured. If the company implements another CCTV camera that monitors an entrance, that lens value should be around 8mm, which allows a smaller area to be monitored.

depth of field refers to the portion of the environment that is in focus when shown on the monitor. The depth of field varies depending upon the size of the lens opening, the distance of the object being focuse on, and the focal length of the lens. The depth of field increases as the size of the lens opening decreases, the subject distance increases, or the focal length of the lens decreases. So, if you want to cover a large area and not focus on specific items, it is best to use a wide-angle lens and a small lens opening.

EPA-approved replacements for Halon: FM-200, NAF-S-III, CEA-410, FE-13, Water, Inergen, Argon and Argonite

Rate-of-rise temperature sensors usually provide a quicker warning than fixed-temperature sensors

Lighting should be used to discourage intruders and provide safety for personnel, entrances, parking areas and critical sections. Critical areas should be illuminated 8 feet high and 2 feet out.

No comments:

Post a Comment