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55. d. The best strategy is to start with interior security, proceed to the exterior security, and then to the outer perimeter. This path provides a clear picture of all areas needing protection and ensures completeness of analysis.

56. Dry powder is used to extinguish which of the following fires?

a. Class A fires

b. Class B fires

c. Class C fires

d. Class D fires

56. d. Class D fire is extinguished by dry powder. Class A fire is extinguished by water, Class B by carbon dioxide, and Class C by a nonconducting extinguishing agent.

57. Which of the following physical intrusion-detection system components report on the condition of the system?

a. Motion sensors

b. Control unit

c. Monitor unit

d. Transmission lines

57. c. The physical intrusion detection system contains four components: motion sensors, control unit, monitor unit, and transmission lines. These components are integrated to operate in a specified manner. A monitor unit is a device that senses and reports on the condition of a system. Motion sensors detect movement inside the area to be protected. A control unit is the terminal box for all sensors. Transmission lines communicate events, signals, and sensors.

58. Which of the following sensors detect the sounds of forced entry into a computer facility?

a. Proximity sensors

b. Microwave sensor

c. Ultrasonic sensor

d. Photoelectric sensor

58. c. Ultrasonic sensors operate by sounds. Proximity sensors employ an electrical field such as electromagnetic or electrostatic. Microwave sensors operate by radio or radar frequency transceiver. A photoelectric sensor operates by an interruption of light beam transmitted to the receiver.

59. Which of the following statements is true about physical security and life safety?

a. Physical security strives to control entry.

b. Life safety focuses on providing easy exit from a facility.

c. Life safety measures are expensive.

d. It is possible to achieve an effective balance between physical security and life safety.

59. d. It is important to understand that the objectives of physical access controls may be in conflict with those of life safety. Simply stated, life safety focuses on providing easy exit from a facility, particularly in an emergency, whereas physical security strives to control entry. In general, life safety must be given first consideration, but it is usually possible to achieve an effective balance between the two goals. Life safety measures do not need to be expensive; sometimes the least expensive measures work best.

60. Which of the following sensors is used to call for assistance?

a. Contact sensor

b. Duress sensor

c. Vibration sensor

d. Infrared sensor

60. b. The duress sensor is used to call for assistance in case of danger, and it consists of a hand- or foot-operated switch usually found in bank teller areas. A contact sensor is activated when an electrical circuit is broken. A vibration sensor detects forced entry through metal barriers placed over windows, for example. An infrared sensor detects body heat.

61. An effective physical security control when accessing sensitive facilities and systems includes which of the following?

a. Smart card

b. Biometric measure

c. Photo ID

d. Combination of smart card, biometric, and photo ID

61. d. Smart card technology, in combination with biometrics, offers great levels of security when accessing buildings, computers, and large dollar accounts. The smart card can be used in a number of ways to identify the cardholder to the physical access control system. These include (i) carrying a number that can be used to retrieve the cardholder’s access privileges from the physical access control system’s files, (ii) carrying access control privileges on-board the card, (iii) carrying a photo ID to verify the cardholder’s identity, and (iv) carrying a biometric template against which the cardholder’s live scan is compared to verify the cardholder’s identity.

62. A power brownout condition is which of the following?

a. Long-term lag

b. Long-term sag

c. Short-term lag

d. Short-term sag