Friday, July 23, 2010

CISSP - Physical Security

Types of Motion Detectors:
Wave pattern: think microwave, if the frequency bouncing back changes from norm then there is motion.
Capacitance: monitors an eletrical field for change - used for small area - think of an area surrounding an object in a museum.
Audio: listens for noise
Photoelectric: think grid of light (visible or not)

Types of fire suppression systems
Water Sprinklers
Wet Pipe: Pipe is full of water to the sprinkler head - quit to get water to fire - but if it was a false alarm, can cause equipment damage for no reason
Dry Pipe: Pipe is not full of water - providing a little bit of time to react to a false alarm - pipes could have leaks that aren't realized until a fire forces water into the pipes.
Deluge: Similar to dry pipe - but for high volumes of water - which is why they are not used around computer equipment
Preaction: dry until heat sensor primes it (now wet pipe) - then another heat sensor releases the water

Classes of Fire
A - Common combustibles - like wood
B - Burnable fules - like gas
C - Electrical - like a data center
D - Grease or chemical - like a kitchen

Halon 1301 (1211 - portable) above 10% and >900 degrees it degrades into hydrogen flouride, hydrogen bromide, and bromine which is toxic. For this reason, it has been replaced (via Environmental Protection Act of 1990) by FM-200 (Argon and Inergen are also options but not as effective). If a Halon system is in place - it CAN continue to be used, but extra measures must be taken when it is used

CCTV: Closed Circuit Television - Decrease Focal Length to widen view larger iris for less light areas

CPTED: Crime Prevention Through Environmental Design

2 inch - Normal
1 inch - High
3/8 inch - Extremely high
Gauge - smaller gauge = bigger diameter (tougher fence)
3-4 feet - Deter casual
8 feet - deter determined

Piezoelectric: think kinetic energy - not really related but it was thrown in as a decoy answer and I didn't know what it was

Exterior Lighting: 2 feet of candlepower at 8 feet above the fence so as to blind intruders from seeing past the fence and illuminating them for the cameras

Glare Protection: pointing lights towards potential intruders and away from guards.

Fixed lighting = Fixed Iris as it doesn't need to adjust for changes in light

Classes of Gates:
1 - Residential
2 - Commercial
3 - Industrial
4 - Restricted

Static Electricity
1500 static volts can damage a HDD and as little as 10 static volts can damage some electrical components. Humans cannot perceive until 1500 and the typical scuff on the carpet produces closer to 12,000.

Access to Server room - the technician side of me says that admins need access. The CISSP side of me (needs to) says that the server room should be highly controlled. Admins should be able to do most everything remotely.

Must have positive pressurization - meaning if the doors are opened - air rushes out as opposed to pulling dusty dirty air in.
Too much moisture = corrosion
Too little moisture = static electricity
Too much heat = over heat
Too little heat = slowed performance

Fail-safe - doors are open
Fail-secure - doors are closed with an emergency bar(or other method) to keep people from being trapped in

Warder < Pin&Tumbler
Bump key is cut to number 9 position (not sure what that means) - and allows the lock picker to bump the key while applying pressure to the lock to open the lock

Annunciation System verbally alerts guards so that they can take action

Bollard - blocks a vehicle from passing - usually metal or cement and arranged in a line of columns.

Mantrap is two sets of doors - like in castles where you go through two sets of gates and in between they are ready to poor boiling oil on you!!

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