2024年最新のCDCPプレミアム資料テストPDFの無料問題集お試しセット [Q43-Q68]

2024年最新のCDCPプレミアム資料テストPDFの無料問題集お試しセット

試験合格を向けてCDCP今すぐ弊社のEPI Data Centre試験パッケージを使おう

質問 # 43
Which one of the following is a Natural Disaster?

• A. Human Error
• B. Blackouts
• C. Grid Failure
• D. Hurricanes

正解：D

解説：
According to the CDCP® Preparation Guide, a natural disaster is a catastrophic event that is caused by natural forces and has a significant impact on human lives, property, and environment. Hurricanes are examples of natural disasters, as they are powerful storms that form over warm ocean waters and produce strong winds, heavy rain, storm surges, and flooding. Grid failure, blackouts, and human error are not natural disasters, but rather man-made or technological disasters that result from failures or errors in human systems or activities.
References: CDCP® Preparation Guide, page 9. Natural Disaster Readiness for Data Centers. EM-DAT - The international disaster database. PDC Global - Pacific Disaster Center.

質問 # 44
is the ability of a system or component to perform its required functions under stated conditions for a specified period of time.

• A. Agility
• B. Scalability
• C. Reliability
• D. Availability

正解：C

解説：
According to the IEEE definition, reliability is the ability of a system or component to perform its required functions under stated conditions for a specified period of time. Reliability is a measure of how often a system or component fails, and how long it takes to recover from a failure. Reliability is closely related to availability, which is the degree to which a system or component is operational and accessible when required for use.
Reliability and availability are both affected by factors such as design, maintenance, testing, and environmental conditions.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, Reliability engineering - Wikipedia

質問 # 45
Starting from which Rating does the requirement of Concurrently Maintainability becomes relevant?

• A. Rated-3
• B. Rated-1
• C. Rated-4
• D. Rated-2

正解：A

解説：
The requirement of Concurrently Maintainability becomes relevant starting from Rated-3, according to the Uptime Institute Tier Classification System1. Concurrently Maintainability means that any component or system in the data centre can be maintained or replaced without affecting the availability of the IT equipment.
This requires having redundant capacity components and multiple independent distribution paths serving the IT equipment. Rated-3 data centres are designed to achieve Concurrently Maintainability and have a minimum uptime of 99.982%. Rated-4 data centres also have Concurrently Maintainability, but they also have Fault Tolerance, which means that they can withstand any single unplanned event without affecting the availability of the IT equipment. Rated-4 data centres have a minimum uptime of 99.995%. Rated-1 and Rated-2 data centres do not have Concurrently Maintainability, as they have only one distribution path serving the IT equipment and no redundant capacity components. Rated-1 data centres have a minimum uptime of 99.671% and Rated-2 data centres have a minimum uptime of 99.741%.
References:
1: Uptime Institute Tier Classification System2, page 1, section 1 2: Data Center Tiers Classification Explained: (Tier 1, 2, 3, 4)3, page 1, section 1 3: Data Center Tier Standards4, page 1, section 1

質問 # 46
Where should exit/emergency signs be located?

• A. In the Computer room only
• B. At every escape door and pathways leading to doors (arrows)
• C. At each door
• D. Depends on the policy of the data centre

正解：B

解説：
According to the EPI Data Centre Operations Standard (DCOS), exit/emergency signs should be located at every escape door and pathways leading to doors (arrows) to ensure a safe and quick evacuation in case of an emergency1. This is also consistent with the best practices for data centre emergency preparedness and response, which recommend having a clear and visible signage system for emergency exits23.
References: 1: EPI Data Centre Operations Standard (DCOS), Version 2.0, Section 5.4.2.1, Page 42 2: How to Prepare and Respond to Data Center Emergencies, White Paper 217, Schneider Electric, Page 4 3: How to Properly Manage Data Center Emergencies, IT Business Edge, Slide 2

質問 # 47
Which one of the following is an Objective of Data Center Fire Protection?

• A. Information
• B. Representation
• C. Suppression
• D. Depression

正解：C

解説：
The objective of data center fire protection is to suppress or extinguish a fire before it can cause significant damage to the equipment, personnel, or business continuity. Fire suppression systems are designed to reduce the heat, oxygen, or fuel elements of the fire triangle, and to limit the spread of fire and smoke. Fire suppression systems can be classified into two types: water-based and gas-based. Water-based systems include sprinklers, mist, and water spray systems, which use water as the extinguishing agent. Gas-based systems include inert gas, halocarbon, and clean agent systems, which use gases or chemicals as the extinguishing agent. The choice of fire suppression system depends on several factors, such as the fire risk, the type of fuel, the environmental impact, the reliability, the cost, and the compatibility with the data center equipment and operations.
References:
*EPI Data Centre Professional (CDCP®) Preparation Guide, page 31
*A Comprehensive Approach To Data Center Fire Safety

質問 # 48
From the list below, which sensor detects smoke the fastest?

• A. VESDA/HSSD
• B. Photoelectric detector
• C. Sprinkler bulbs
• D. lonization detector

正解：A

解説：
VESDA (Very Early Smoke Detection Apparatus) or HSSD (High Sensitivity Smoke Detection) systems are the fastest smoke sensors among the options listed. These systems use a network of pipes to draw air samples from the protected area and analyze them using a laser-based detection chamber. VESDA/HSSD systems can detect smoke at very low concentrations, typically in the range of 0.005 to 20 percent obscuration per meter.
This means they can provide early warning of a fire before it becomes visible or spreads. VESDA/HSSD systems are ideal for data centers and other critical facilities that require high levels of fire protection and minimal downtime.
References: VESDA Smoke Detection Systems - Xtralis, HSSD Smoke Detection Systems - Fire Protection Online, Smoke Detection in Data Centers - Siemens.

質問 # 49
The three elements of the fire triangle are,and. (Choose three.)

• A. Fuel
• B. Earth
• C. Heat
• D. Oxygen
• E. Water

正解：A、C、D

解説：
The fire triangle is a simple model that illustrates the three elements that a fire needs to ignite and sustain:
oxygen, heat, and fuel. Oxygen is the oxidizing agent that enables the combustion reaction, heat is the energy source that raises the temperature of the fuel to its ignition point, and fuel is the material that reacts with oxygen and releases heat and light. Removing any one of these elements can extinguish a fire. For example, water can reduce the heat and the oxygen, sand or soil can smother the fuel and the oxygen, and fire extinguishers can displace the oxygen or lower the temperature.
References: EPI Data Centre Professional (CDCP®) Reference Materials, page 66.EPI Data Centre Framework, Module 4: Fire Protection, page 4. 1, 2, 3.

質問 # 50
What is the main risk for a data centre when the water supply fails?

• A. Failure to the water supply could result in IT failure and/or denial of access to operate.
• B. Failure to the water supply could result in sudden changes of the relative humidity in the Computer room.
• C. Failure to the water supply could cause issues for the cooling of back-up generators.
• D. Failure to the water supply could result in DX cooling systems to fail.

正解：C

解説：
Back-up generators are essential for providing power to the data centre in case of a utility outage. However, back-up generators also generate a lot of heat, which needs to be dissipated by a cooling system. The cooling system may rely on water supply, either from the municipal network or from a dedicated tank. If the water supply fails, the cooling system may not function properly, leading to overheating and potential damage to the generators. This could compromise the reliability and availability of the data centre power supply and cause downtime or data loss.
References:
1: CDCP Preparation Guide, page 18, section 2.3.2 2: Data Center Generator Cooling Systems3, page 1, section 1 4: Data Center Cooling Systems5, page 1, section 1

質問 # 51
What is a requirement of an FM200 (HFC-227) installation?

• A. Install the gas containers (tanks) close to the data centre.
• B. Drainage system under the raised floor.
• C. Install pre-action sprinklers in the same room as the FM200.
• D. It is a high-pressure gas; therefore nozzles must be mounted with two brackets.

正解：D

解説：
FM200 (HFC-227) is a clean agent fire suppression system that uses a high-pressure gas to extinguish fires by reducing the oxygen concentration and absorbing the heat. FM200 is stored in cylinders at pressures of up to
42 bar (600 psi) and is released through nozzles into the protected area. Because of the high pressure, the nozzles must be mounted with two brackets to prevent them from moving or breaking during discharge. The brackets must be securely attached to the ceiling or wall and aligned with the nozzle outlet. The nozzle outlet must also be free of any obstructions that could affect the discharge pattern or distribution.
References:
*EPI Data Centre Professional (CDCP®) Preparation Guide, page 32
*FSL-227 Technical Manual, page 10
*Firetrace ILP Manual, page 21

質問 # 52
An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?

• A. The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.
• B. The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.
• C. The first number represents the distance for a 10 Gb/s connection; the second number represents the distance for a 1 Gb/s connection.
• D. The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.

正解：D

解説：
Optical fiber cables are composed of a core, a cladding, and a coating. The core is the central part of the fiber that carries the light signal. The cladding is the layer surrounding the core that reflects the light back into the core and prevents signal loss. The coating is the protective layer that covers the cladding and provides mechanical strength and environmental protection. The specifications of an optical fiber cable indicate the dimensions of the core and the cladding in microns (m), which are one millionth of a meter. For example, a
50/125 m cable has a core diameter of 50 m and a cladding diameter of 125 m. The coating diameter is usually
250 m, but it is not part of the specifications.
References: Multimode Optical Fiber Selection & Specification - Corning, Optical Fiber OM3 (50/125µm Multimode Fiber), 50/125 Graded-Index OM2 Optical Fiber - OFS

質問 # 53
Which formula can be used to define risk?

• A. Risk = Security * Criminality
• B. Risk = Impact * Probability
• C. Risk = Time * Quality
• D. Risk = Probability * Cost

正解：B

解説：
According to the CDCP Preparation Guide1, risk can be defined as the product of impact and probability.
Impact is the measure of the negative consequences or losses that may result from a risk event, such as downtime, data loss, or damage to the data centre. Probability is the measure of the likelihood or frequency of a risk event occurring, based on historical data, expert judgment, or statistical analysis. By multiplying impact and probability, risk can be quantified and compared, which helps in prioritizing and mitigating the risks. For example, a risk event that has a high impact but a low probability may have the same risk level as a risk event that has a low impact but a high probability.
References:
1: CDCP Preparation Guide, page 25, section 2.5.1 2: Data center risk assessment: A decision-making tool3, page 1, section 1 4: Accounting for Risk in Your Data Center Design/Build Strategy5, page 1, section 1 6: A Novel Framework for Data Center Risk Assessment7, page 1, section 1

質問 # 54
Which one of the following is a device that uses circulating chilled water to remove heat?

• A. Computer Room Air System Unit (CRAS)
• B. Computer Room Air Suspension Unit (CRAS)
• C. Computer Room Air Handling Unit (CRAH)
• D. Computer Room Air Suppression Unit (CRAS)

正解：C

解説：
A computer room air handling unit (CRAH) is a device that uses circulating chilled water to remove heat from the data center environment. A CRAH consists of a fan, a coil, and a filter. The fan draws the warm air from the data center and passes it through the coil, where the heat is transferred to the chilled water. The chilled water is supplied by a chiller or a cooling tower, and the cooled air is returned to the data center. A CRAH is different from a computer room air conditioning unit (CRAC), which uses a refrigerant instead of chilled water to cool the air.
References:
*EPI Data Centre Professional (CDCP®) Preparation Guide, page 36
*Chilled Water Systems: Applications and Common Uses
*The Principles of Basic Refrigeration: What is a chiller?

質問 # 55
Which type of Humidifier is composed of water-filled canister containing electrodes?

• A. Ultrasonic Humidifier
• B. Water Canister Humidifier
• C. Infrared Humidifiers
• D. Steam Canister Humidifier

正解：D

解説：
A steam canister humidifier is a type of humidifier that uses electricity to heat water in a canister containing electrodes. The water conductivity and the water level determine the amount of current and steam production.
The steam canister humidifier is also known as an electrode boiler humidifier or an electrode steam humidifier123.
References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 192: Electrode and resistive type humidifiers compared | steamovap technologies inc3: Know-How | Electrode Steam Humidifier - Condair Group.

質問 # 56
What needs to be installed in the battery room when using Lithium-ion batteries?

• A. High capacity air-conditioning equipment since Lithium-ion batteries are sensitive to high temperatures, which can reduce their lifetime.
• B. A proper ventilation system since Lithium-ion batteries produce highly flammable Hydrogen gas during charging.
• C. A battery management system to monitor and prevent unsafe temperatures during charging/discharging.
• D. A proper supply of distilled water.

正解：C

解説：
According to the EPI Data Centre Training Framework, lithium-ion batteries are becoming more popular in data centres due to their higher energy density, longer lifespan, and lower maintenance costs compared to lead-acid batteries1. However, lithium-ion batteries also have some drawbacks, such as higher initial cost, stricter safety requirements, and potential thermal runaway risks1. Therefore, a battery management system (BMS) is essential to monitor and control the voltage, current, temperature, and state of charge of each battery cell or module, and to prevent overcharging, over-discharging, or overheating23. A BMS can also communicate with the UPS system and provide information on the battery status, performance, and health2.
References: 1: EPI Data Centre Training Framework, Module 5: Power, Section 5.3.2: Battery Technologies, Page 5-19 2: Benefits of Lithium-ion batteries for data centers at the edge,Data Center Knowledge, Page 1 3:
Lithium-Ion Batteries in Data Centers, Data Center Systems, Inc, Page 1

質問 # 57
Which one of the following is an Audible Signaling and Notification Device?

• A. Clocks
• B. Sirens
• C. Strobes
• D. Alarms

正解：B

解説：
According to the CDCP® Preparation Guide, an audible signaling and notification device is a device that produces a sound to alert or notify the occupants of a data center of an event or condition. Sirens are examples of such devices, as they can emit loud and distinctive tones to warn of fire, emergency, or security incidents.
Strobes, on the other hand, are visual signaling and notification devices that produce flashes of light to attract attention or convey information. Alarms and clocks are not specific types of devices, but rather general terms that can refer to various audible or visual devices.
References: CDCP® Preparation Guide, page 30. Audible Visual Notification | System Sensor | Honeywell.
Audible-Visual Signaling Devices - AutomationDirect.

質問 # 58
The UPS vendor is offering the latest model of their UPS to you. The vendor indicates that the UPS is categorized as VFD class.
Is this UPS a fit for your mission-critical data centre?

• A. Yes, but only if you oversize the battery bank with 10%.
• B. No
• C. Yes
• D. Yes, but only if they install it with a 12-pulse rectifier.

正解：B

解説：
A UPS (uninterruptible power supply) that is categorized as VFD class is not a fit for your mission-critical data centre, because it does not provide adequate protection against voltage and frequency variations. VFD stands for Voltage and Frequency Dependent, which means that the output voltage and frequency of the UPS depend on the input voltage and frequency. VFD UPSs are also known as offline, standby, or line-interactive UPSs. They typically switch to battery power only when the input power fails or goes beyond a certain threshold. However, this switching may cause a brief interruption or a transient in the output power, which can affect the performance and reliability of the ICT equipment. Moreover, VFD UPSs do not filter or regulate the input power, which means that they pass on any voltage or frequency fluctuations, harmonics, or noise to the output power. These power quality issues can also damage or degrade the ICT equipment and the data.
For your mission-critical data centre, you need a UPS that is categorized as VFI class, which stands for Voltage and Frequency Independent. VFI UPSs are also known as online, continuous, or double-conversion UPSs. They provide a constant and clean output power that is independent of the input power. VFI UPSs convert the input AC power to DC power, and then convert it back to AC power with the desired voltage and frequency. This double conversion process isolates the output power from the input power, and eliminates any power quality issues. VFI UPSs also have zero switching time, which means that they do not cause any interruption or transient in the output power when switching to battery power. VFI UPSs are designed to protect the ICT equipment and the data from any adverse effects of voltage and frequency variations, and to ensure the highest level of availability and reliability.
References:
1: CDCP Preparation Guide, page 17, section 2.3.1 2: Understanding UPS Classification: Fuji Electric's Technical Guide3, page 1, section 1 4: Uninterruptible Power Supplies Key Product Criteria5, page 1, section
1 6: UPS Function: Reduced Input Voltage for VFDs - KEB7, page 1, section 1

質問 # 59
What should be a consideration when having casters (rollers/wheels) or feet under the rack?

• A. Casters and feet should not be locked to ensure the racks are still able to be moved to another position.
• B. Casters and feet should be of a soft material, for example rubber, to avoid damage to the raised floor tile.
• C. Skirts at the bottom of the rack to avoid air flow between the hot and cold aisles.
• D. The casters and feet should be larger to avoid a too heavy point load on the floor tile.

正解：D

解説：
The casters and feet under the rack are used to support the weight of the rack and its equipment, and to allow the rack to be moved if needed. However, the casters and feet should also be designed to avoid putting too much pressure on the floor tile, especially if the data centre uses a raised floor system. A too heavy point load on the floor tile can cause the tile to crack, deform, or collapse, which can damage the rack, the equipment, and the underlying infrastructure. To prevent this, the casters and feet should be larger, so that they can distribute the weight over a larger area and reduce the point load. The casters and feet should also be compatible with the floor type and the load rating of the floor tile.
References:
1: CDCP Preparation Guide, page 22, section 2.4.1.1 2: Raised Floor Design Considerations for Data Center3, page 1, section 1 4: [SOLVED] server rack on casters or feet5, page 1, section 1

質問 # 60
What is the recommended location for the Isolation Transformer in relation to the ICT-Equipment location?

• A. The isolation transformer should be as far away as possible to the ICT equipment to avoid potential EMF.
• B. The isolation transformer should be as close as possible to the ICT equipment but taking into account potential EMF.
• C. The isolation transformer should be installed within the rack in which the ICT equipment has been installed.
• D. The isolation transformer has to be installed within the power entry point of the building due to electrical code (regulation) requirements.

正解：B

解説：
According to the EPI Data Centre Training Framework, an isolation transformer is a device that transfers electrical power from one circuit to another without changing the voltage or frequency, but providing galvanic isolation1. Galvanic isolation means that there is no direct electrical connection between the input and output circuits, which can prevent ground loops, reduce noise, and improve safety2. An isolation transformer can also provide voltage stepdown or stepup, create a local ground-bonded neutral, reduce harmonic currents, and provide taps for abnormal mains voltage3.
The location of the isolation transformer in relation to the ICT equipment depends on the purpose and design of the transformer. In general, the isolation transformer should be as close as possible to the ICT equipment, but taking into account potential EMF4. EMF is a form of electromagnetic interference (EMI) that can affect the performance and reliability of the ICT equipment5. The closer the isolation transformer is to the ICT equipment, the shorter the cable length and the lower the voltage drop and power loss4. However, the isolation transformer should also be far enough from the ICT equipment to avoid EMF, which can be reduced by using proper shielding, grounding, and spacing5.
The isolation transformer should not be installed as far away as possible to the ICT equipment, as option B suggests, because this would increase the cable length and the voltage drop and power loss4. The isolation transformer does not have to be installed within the power entry point of the building, as option C suggests, because this is not a requirement of the electrical code or regulation, and it may not be optimal for the data centre power system. The isolation transformer should not be installed within the rack in which the ICT equipment has been installed, as option D suggests, because this would increase the heat load and the noise level in the rack, and it may not fit in the rack space.
References: 1: EPI Data Centre Training Framework, Module 5: Power, Section 5.4.3: Isolation Transformers, Page 5-38 2: Guidelines for using isolation transformers in data center UPS systems - EEP1, Page 1 3: The Role of Isolation Transformers in Data Center UPS Systems2, Page 2 4: Data Center Transformer | Power Distribution - FGC Construction3, Page 1 5: EPI Data Centre Training Framework, Module 5: Power, Section
5.4.1: Electromagnetic Interference, Page 5-34 : Data centre transformers manufacturers - TMC Transformers4, Page 1 : The Role of Isolation Transformers in Data Center UPS Systems2, Page 25

質問 # 61
Which one of the following is an example of Direct Cost?

• A. Legal fees
• B. Reduced customer satisfaction
• C. Damaged brand perception
• D. Negative public relations

正解：A

解説：
Legal fees are an example of direct cost because they can be directly attributed to a specific project, product, or service. Legal fees are incurred for the purpose of obtaining legal advice, drafting contracts, resolving disputes, or complying with regulations related to the core business activity. Legal fees are not general overhead expenses that are shared by multiple cost objects.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, Direct Cost - Overview, Examples, Tax Implications

質問 # 62
What should be considered when implementing hot- or cold-aisle containment in an existing computer room?

• A. Equipment will get too hot at the rear (back) of the rack potentially resulting in more ICT hardware failures.
• B. It will be more difficult to install power and network cabling in the contained area.
• C. It creates potential issues with the existing fire suppression system(s).
• D. The delta-T of the equipment will increase too much causing reliability issues.

正解：C

解説：
Hot- or cold-aisle containment is a strategy to improve the cooling efficiency and reduce the energy consumption of data centers by isolating the hot exhaust air from the cold supply air. However, implementing this strategy in an existing computer room may create potential issues with the existing fire suppression system(s), such as:
*The containment barriers may interfere with the distribution and activation of the fire suppression agents, such as water, gas, or aerosol, and reduce their effectiveness in extinguishing a fire.
*The containment barriers may create pockets of high temperature and pressure that could damage the equipment or the containment structure itself in the event of a fire.
*The containment barriers may obstruct the access and visibility of the fire detection and alarm devices, such as smoke detectors, heat sensors, or manual call points, and delay the response time of the fire suppression system(s).
*The containment barriers may violate the local fire codes and regulations that specify the minimum clearance and ventilation requirements for the data center.
Therefore, when implementing hot- or cold-aisle containment in an existing computer room, it is important to consider the impact on the existing fire suppression system(s) and take appropriate measures to ensure the safety and compliance of the data center, such as:
*Consulting with the fire authorities and the fire suppression system vendor to assess the compatibility and suitability of the containment solution with the existing fire suppression system(s).
*Modifying or upgrading the existing fire suppression system(s) to accommodate the containment solution, such as relocating or adding fire suppression devices, adjusting the discharge rate and pressure, or installing a secondary fire suppression system within the contained area.
*Installing fire-rated containment barriers that can withstand high temperatures and resist the spread of fire and smoke, and that have self-closing or automatic release mechanisms in case of a fire.
*Installing fire detection and alarm devices within the contained area and ensuring their proper integration and communication with the existing fire suppression system(s).
*Conducting regular testing and maintenance of the fire suppression system(s) and the containment solution to ensure their functionality and reliability.
References: EPI Data Centre Framework, Module 4: Fire Protection, page 10-11. EPI Data Centre Professional (CDCP®) Reference Materials, page 66-67. 1, 2, 3.

質問 # 63
Which type of Humidifier rapidly vibrates waster to create a fog or mist?

• A. Steam Canister Humidifier
• B. Infrared Humidifier
• C. Water Canister Humidifier
• D. Ultrasonic Humidifier

正解：D

解説：
An ultrasonic humidifier is a type of cool mist humidifier that uses a metallic diaphragm that vibrates at high frequencies to create water droplets that are added to the air. A fan projects these droplets into the air as mist, which then evaporates and humidifies the room. This type of humidifier rapidly vibrates the water to create a fog or mist.
References: EPI Data Centre Training Framework, How Humidifiers Can Help Allergies, Humidifier Buying Guide: Pros and Cons of Different Types.

質問 # 64
The temperature and humidity values indicated on the display of the Computer room air conditioner unit are the values measured at which point?

• A. It is the value measured at the intake of the air conditioner.
• B. It is the average value between the intake and exhaust (outlet) of the air conditioner.
• C. It is the value measured at the exhaust (outlet) of the air conditioner.
• D. It is the value measured at the front of the rack of the aisle the air conditioner is situated.

正解：A

解説：
According to the IBM document on temperature and humidity design criteria1, the temperature and humidity values indicated on the display of the computer room air conditioner unit are the values measured at the intake of the air conditioner. This is because the intake is where the air conditioner draws the air from the computer room and cools and dehumidifies it before sending it back to the computer room. The display shows the current conditions of the computer room air, which are used to adjust the cooling and dehumidifying operations of the air conditioner. The values measured at the exhaust (outlet) of the air conditioner are not displayed, as they are not relevant for the computer room environment. The values measured at the front of the rack of the aisle the air conditioner is situated are also not displayed, as they may vary depending on the distance and location of the rack. The average value between the intake and exhaust (outlet) of the air conditioner is not displayed, as it does not reflect the actual conditions of the computer room air or the air conditioner performance.
References: 1: Temperature and humidity design criteria - IBM

質問 # 65
What should be considered when using a direct air handler for a data centre?

• A. The availability of three-phase power due to the high power requirements of these air handler units.
• B. Cost of operation as power consumption on these units tend to be higher compared to traditional air conditioning technology.
• C. Temperature, humidity and contamination of the outdoor environment.
• D. Space available inside the computer rooms as the air handler space requirement for the inside the Computer room is quite large.

正解：C

解説：
Direct air handlers are a type of cooling system that use outdoor air to cool the data centre. They draw in fresh air from outside, filter it, and supply it to the data centre at the desired temperature and humidity level. Direct air handlers can reduce the energy consumption and operating costs of data centres by eliminating the need for mechanical cooling or refrigeration. However, they also have some challenges and limitations that need to be considered. One of the main factors to consider when using direct air handlers for data centres is the temperature, humidity and contamination of the outdoor environment. Depending on the location and climate of the data centre, the outdoor air may not always be suitable for cooling the data centre. For example, if the outdoor air is too hot, too humid, or too polluted, it may not provide enough cooling capacity, or it may damage the IT equipment or cause corrosion. Therefore, direct air handlers need to have sensors and controls to monitor the outdoor air quality and adjust the airflow accordingly. They may also need to have backup cooling systems or supplementary cooling devices, such as evaporative coolers or heat exchangers, to cope with extreme weather conditions or peak loads.
References: Data Center Cooling: A Comprehensive Guide - Dgtl Infra, Carrier Data Center Cooling System
39DC, Dublin Data Center: Rooftop Air Handlers.

質問 # 66
Which is the most damaging type of floor load?

• A. All loads are equally damaging to raised floor tiles
• B. Uniformly Distributed Load (UDL)
• C. Rolling Load (RL)
• D. Concentrated Load / Point Load (CP/ PL)

正解：C

解説：
The most damaging type of floor load for raised floor tiles in a data centre is the rolling load (RL), according to the CDCP Preparation Guide1 and various web sources234. A rolling load is the load that is applied by a moving object, such as a pallet jack, a forklift, or a rack on wheels. A rolling load can cause more stress and fatigue on the raised floor tiles than a static load, such as a concentrated load (CP) or a uniformly distributed load (UDL), because it creates dynamic forces and impacts that can crack, dent, or deform the tiles. Moreover, a rolling load can also damage the pedestals and stringers that support the tiles, and cause the tiles to become loose or misaligned. Therefore, when designing and installing a raised floor system, it is important to consider the maximum rolling load that the tiles can withstand, and to use appropriate materials and methods to enhance the strength and durability of the tiles. For example, some possible solutions include using steel or concrete-filled tiles, reinforcing the edges and corners of the tiles, and using locking or gravity-held systems to secure the tiles.
References:
1: CDCP Preparation Guide, page 23, section 2.4.2 2: Top 5 Considerations - Selecting a Data Center Raised Floor Tile5, page 1, section 1 3: Raised Floor Systems: Explained, Improved and Reinvented6, page 1, section
1 4: Raised Floor Systems: Common Problems and Solutions7, page 1, section 1

質問 # 67
Which one of the following is used in Measuring Business Value?

• A. Regeneration Cost
• B. Upfront Cost
• C. Reliability
• D. Scalability

正解：D

解説：
Measuring business value is the process of assessing the benefits and costs of IT investments and initiatives in relation to the strategic objectives and priorities of the organization. One of the factors that can be used to measure business value is scalability, which is the ability of a system or component to handle increasing workloads or demands without compromising performance, quality, or functionality. Scalability is important for business value because it enables the organization to adapt to changing market conditions, customer expectations, and growth opportunities. Scalability can also reduce operational costs, increase efficiency, and improve customer satisfaction. Therefore, scalability is one of the factors that can be used in measuring business value.
References:
*EPI Data Centre Training Framework1
*EPI Data Centre Competence Framework2
*Measuring the Business Value of IT3
*How to Measure the Business Value with Effective Data Quality Governance
*7 Rules for Demonstrating the Business Value of IT

質問 # 68
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