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NEW QUESTION: 1
The covariance of the market's returns with the stock's returns is .008. The standard deviation of the market's returns is .1 and the standard deviation of the stock's returns is .2. What is the correlation coefficient between the stock and market returns?
A. .91
B. 1.25
C. .4
D. 1.0
Answer: C
Explanation:
Explanation/Reference:
Explanation:
Covariance = (standard deviation 1)(standard deviation 2)(correlation coefficient 1,2) Correlation coefficient
= cov/(st'd1)(st'd2) = .008/(.1)(.2) = .4
NEW QUESTION: 2
Which of the following fire extinguishing systems incorporating a detection system is currently the most recommended water system for a computer room?
A. Deluge
B. Dry pipe
C. Preaction
D. Wet pipe
Answer: C
Explanation:
The preaction system combines both the dry and wet pipe systems, by first
releasing the water into the pipes when heat is detected (dry pipe), then releasing the water flow
when the link in the nozzle melts (wet pipe).
This allows manual intervention before a full discharge of water on the equipment occurs. This is
currently the most recommended water system for a computer room.
According to the ISC2 Official Study Guide:
All buildings should be equipped with an effective fire suppression system, providing the building
with around the clock protection. Traditionally, fire suppression systems employed arrays of water
sprinklers that would douse a fire and surrounding areas.
Sprinkler systems are classified into four different groups: wet, dry, preaction, and deluge.
Wet systems have a constant supply of water in them at all times; these sprinklers once activated
will not shut off until the water source is shut off.
Dry systems do not have water in them. The valve will not release until the electric valve is
stimulated by excess heat.
Pre-action systems incorporate a detection system, which can eliminate concerns of water
damage due to false activations. Water is held back until detectors in the area are activated.
Deluge systems operate in the same function as the pre-action system except all sprinkler heads
are in the open position. Water may be a sound solution for large physical areas such as
warehouses, but it is entirely inappropriate for computer equipment. A water spray can irreparably
damage hardware more quickly than encroaching smoke or heat. Gas suppression systems
operate to starve the fire of oxygen. In the past, Halon was the choice for gas suppression
systems; however, Halon leaves residue, depletes the ozone layer, and can injure nearby
personnel.
Shon Harris in her latest study guide says:
Four main types of water sprinkler systems are available: wet pipe, dry pipe, preaction, and
deluge.
Wet pipe Wet pipe systems always contain water in the pipes and are usually discharged by temperature control-level sensors. One disadvantage of wet pipe systems is that the water in the pipes may freeze in colder climates. Also, if there is a nozzle or pipe break, it can cause extensive water damage. These types of systems are also called closed head systems.
Dry pipe In dry pipe systems, the water is not actually held in the pipes. The water is contained in a "holding tank" until it is released. The pipes hold pressurized air, which is reduced when a fire or smoke alarm is activated, allowing the water valve to be opened by the water pressure. Water is not allowed into the pipes that feed the sprinklers until an actual fire is detected. First, a heat or smoke sensor is activated; then, the water fills the pipes leading to the sprinkler heads, the fire alarm sounds, the electric power supply is disconnected, and finally water is allowed to flow from the sprinklers. These pipes are best used in colder climates because the pipes will not freeze.
Preaction Preaction systems are similar to dry pipe systems in that the water is not held in the pipes, but is released when the pressurized air within the pipes is reduced. Once this happens, the pipes are filled with water, but it is not released right away. A thermal-fusible link on the sprinkler head has to melt before the water is released. The purpose of combining these two techniques is
to give people more time to respond to false alarms or to small fires that can be handled by other means. Putting out a small fire with a handheld extinguisher is better than losing a lot of electrical equipment to water damage. These systems are usually used only in data processing environments rather than the whole building, because of the higher cost of these types of systems.
Deluge A deluge system has its sprinkler heads wide open to allow a larger volume of water to be released in a shorter period. Because the water being released is in such large volumes, these systems are usually not used in data processing environments. Reference used for this question: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 10: Physical security (page 336). and Corporate; (Isc)2 (2010-04-20). Official (ISC)2 Guide to the CISSP CBK, Second Edition ((ISC)2 Press) (Kindle Locations 14379-14391). Taylor & Francis. Kindle Edition. and Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (Kindle Locations 1024510253). McGraw-Hill. Kindle Edition. and Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (Kindle Locations 1025610260). McGraw-Hill. Kindle Edition.
NEW QUESTION: 3
在 MSR 路由器上, ping 命令的 -m 参数指定发送 ICMP Echo Request 报文的时间间隔,取值范围为 1~ 65535 ,单位为毫秒,它的默认值为 ______ 毫秒。
A. 0
B. 1
C. 2
D. 3
Answer: B