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NEW QUESTION # 10
Do I need to check the local standards if I already comply to international standards?
- A. You need to check the local standards to ensure compliance to these standards.
- B. Compliance to only international standards is good enough as most local standards are derived from international standards.
- C. Data centres only need to comply to international standards since they are connected to a worldwide international network infrastructure.
- D. Local standards do not to be checked as some countries have too many local standards, which will slow down the data centre construction.
Answer: A
Explanation:
Data centre design and infrastructure standards can vary from country to country, depending on the local regulations, codes, and practices. Therefore, it is important to check the local standards before designing, building, or operating a data centre in a specific location. Compliance to only international standards may not be sufficient or adequate to meet the local requirements, which could result in legal, financial, or operational risks. For example, some countries may have stricter fire safety, environmental, or energy efficiency standards than the international ones. Some countries may also have different electrical standards, such as voltage, frequency, or plug types. By checking the local standards, you can ensure that your data centre is compliant, safe, and efficient in the local context.
References:
1: Data Center Design: Which Standards to Follow?2, page 1, section 1 3: The Most Important Data Center Design and Infrastructure Codes and Standards4, page 1, section 1 5: Explaining the new family of ISO Data Centre Standards6, page 1, section 1 7: Standards for data centre certification. Is a changing coming?8, page 1, section 1
NEW QUESTION # 11
What is a requirement of an FM200 (HFC-227) installation?
- A. It is a high-pressure gas; therefore nozzles must be mounted with two brackets.
- B. Drainage system under the raised floor.
- C. Install pre-action sprinklers in the same room as the FM200.
- D. Install the gas containers (tanks) close to the data centre.
Answer: A
Explanation:
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
NEW QUESTION # 12
Does unplanned downtime of a data centre have an impact on the business results?
- A. No, unplanned data centre downtime is already financially planned for in the yearly budget planning process.
- B. Yes, but data centre downtime only impacts the airline industry.
- C. Yes, data centre downtime can result in business downtime.
- D. No, because data centres operate independently from the business.
Answer: C
Explanation:
Data centres are essential for supporting the IT operations and applications of various businesses across different industries. Data centre downtime can have a negative impact on the business results, such as loss of revenue, customer satisfaction, productivity, reputation, and competitive advantage. According to a web search, the average cost of data centre downtime in 2020 was $8,851 per minute, and the average duration of a data centre outage was 95 minutes1. This means that a typical data centre outage could cost a business over
$840,000 in direct and indirect losses1. Therefore, data centre downtime can have a significant impact on the business results, regardless of the industry or sector.
References: Unplanned Downtime Costs More Than You Think, Downtime, Outages and Failures - Understanding Their True Costs, The Unplanned Downtime Nightmare - And How Operators Can Avoid
NEW QUESTION # 13
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)
Answer: C
Explanation:
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?
NEW QUESTION # 14
Which one of the following is an Audible Signaling and Notification Device?
- A. Alarms
- B. Sirens
- C. Clocks
- D. Strobes
Answer: B
Explanation:
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.
NEW QUESTION # 15
How many monitoring points should be used in Temperature Measurement?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
According to the EPI Data Centre Professional (CDCP®) Reference Materials, the recommended number of monitoring points for temperature measurement in a data centre is 3 per rack: one at the top, one at the middle, and one at the bottom1. This is to ensure that the temperature distribution within the rack is uniform and within the acceptable range for the equipment. The temperature sensors should be placed at the front of the rack, where the air enters the equipment, and not at the back, where the hot air exits1.
References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 23.
NEW QUESTION # 16
Which one of the following represents the three elements (oxygen, heat and fuel) to interact in order for the fire to exist?
- A. The Fire Triangle
- B. The Fire Technology
- C. The Fire Hexagon
- D. The Fire Class
Answer: A
Explanation:
The fire triangle is a simple model that illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen). A fire naturally occurs when the elementsare present and combined in the right mixture. A fire can be prevented or extinguished by removing any one of the elements in the fire triangle.
References: EPI Data Centre Professional (CDCP®) Preparation Guide, page 9; Fire triangle - Wikipedia; The Fire Triangle Explained - Fire Action
NEW QUESTION # 17
When dealing with glass door racks, cool air is injected into the rack from:
- A. The bottom of the rack.
- B. The top of the rack through the fans and vents mounted inside the rack.
- C. The rear door in a downflow direction.
- D. The front door in a downflow direction.
Answer: C
Explanation:
Glass door racks are a type of rack that have solid glass front doors and rear door heat exchangers (RDHx).
RDHx are devices that use facility coolant to absorb heat from the exhaust air of the IT equipment and return cool air to the room. RDHx can be either passive or active, depending on the fan configuration. In general, IT hardware within the rack is air-cooled and the door heat exchanger uses facility coolant to absorb heat from exhaust air to return air to the facility at or near inlet air temperature to the rack. This rear door heat exchanger can either be a passive or active solution. When dealing with glass door racks, cool air is injected into the rack from the rear door in a downflow direction. This means that the cool air flows from the top to the bottom of the rack, following the natural convection of the hot air rising. This way, the cool air can reach all the IT equipment in the rack and prevent hot spots or overheating.
References: [SOLVED] Rack - Solid or Mesh front door? - Data Center
IT](https://community.spiceworks.com/topic/510677-rack-solid-or-mesh-front-door), ChilledDoor, Rear Door Heat Exchanger | Data Center Cooling, ACS Door Heat Exchanger Requirements for Open Rack.
NEW QUESTION # 18
Which type of Humidifier rapidly vibrates waster to create a fog or mist?
- A. Ultrasonic Humidifier
- B. Infrared Humidifier
- C. Water Canister Humidifier
- D. Steam Canister Humidifier
Answer: A
Explanation:
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.
NEW QUESTION # 19
Which of statements below is true?
- A. Single-mode cabling can use both LED and laser as a light source.
- B. Multi-mode cabling can cross longer distances.
- C. Single-mode cabling is more expensive than multi-mode cabling.
- D. Multi-mode cabling is more expensive than single-mode cabling.
Answer: C
Explanation:
Single-mode cabling and multi-mode cabling are two types of fiber optic cables that differ in their core diameter, wavelength, light source, bandwidth, distance, and cost. Single-mode cabling has a smaller core diameter and uses a laser as a light source, which enables it to transmit data over longer distances and higher bandwidths. However, single-mode cabling is also more expensive than multi-mode cabling, because it requires more precise alignmentand splicing, and more costly light sources and connectors. Multi-mode cabling has a larger core diameter and uses LEDs or VCSELs as a light source, which makes it cheaper and easier to install and maintain. However, multi-mode cabling also has a shorter distance and lower bandwidth than single-mode cabling, because it suffers from more modal dispersion and attenuation.
References:
1: Data Center Cabling: Single Mode vs Multimode Fibers2, page 1, section 1 3: Single Mode vs Multimode Fiber Cable Guide4, page 1, section 1 5: Single-Mode vs. Multi-Mode Fiber Cables: Explained6, page 1, section 1 7: 2 Types of Fiber Optic Cable: Single Mode vs. Multimode Fiber8, page 1, section 1
NEW QUESTION # 20
What is a requirement for both CCTV cameras and recording equipment?
- A. They must be of the same brand.
- B. CCTV cameras can only be used to cover the outside of the building, where as the recording equipment needs to be located in a secure area.
- C. Both must be placed inside the Computer room.
- D. Both must be connected to a UPS.
Answer: D
Explanation:
A UPS (Uninterruptible Power Supply) is a device that provides backup power to electrical equipment in case of a power outage or fluctuation. A UPS is essential for both CCTV cameras and recording equipment, as it ensures that the surveillance system can continue to operate and record without interruption or data loss. A UPS can also protect the CCTV cameras and recording equipment from damage caused by power surges or spikes. Connecting both CCTV cameras and recording equipment to a UPS is a requirement for data centres, as it enhances the security and reliability of the surveillance system.
References: Technical Specification - GeM, [What is a UPS? | Uninterruptible Power Supply | APC by Schneider Electric], [Why You Need a UPS for Your CCTV System - CCTV Camera World].
NEW QUESTION # 21
is the degree to which a system or component is operational and accessibility when required for use.
- A. Scalability
- B. Availability
- C. Agility
- D. Reliability
Answer: B
Explanation:
Availability is the degree to which a system, product or component is operational and accessible when required for use. It is one of the attributes of reliability, which is the ability of a system or component to perform its required functions under stated conditions for a specified period of time. Availability can be calculated as the ratio of the expected value of the uptime (the time when the system is functional) to the total time (uptime plus downtime) of a system or component. Availability can also be influenced by factors such as maintainability, fault tolerance, redundancy, diagnostics, and logistics.
References: EPI Data Centre Professional (CDCP®) Preparation Guide, page 8; Availability - Wikipedia; Reliability - ISO 25000.
NEW QUESTION # 22
What is the recommended location for the Isolation Transformer in relation to the ICT-Equipment location?
- A. The isolation transformer has to be installed within the power entry point of the building due to electrical code (regulation) requirements.
- B. The isolation transformer should be installed within the rack in which the ICT equipment has been installed.
- C. The isolation transformer should be as far away as possible to the ICT equipment to avoid potential EMF.
- D. The isolation transformer should be as close as possible to the ICT equipment but taking into account potential EMF.
Answer: D
Explanation:
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
NEW QUESTION # 23
Mean time between failures is best considered a measure of:
- A. Duration
- B. Reliability
- C. Cost
- D. Size
Answer: B
Explanation:
Mean time between failures (MTBF) is a measure of the reliability of a system or component. It represents the average time that a system or component will operate before it fails. The higher the MTBF, the more reliable the system or component is. MTBF is calculated by dividing the total time of operation by the number of failures that occur during that time. MTBF is used to compare the reliability of similar systems or components, and to help with maintenance planning, inventory management, and system design.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, Reliability Metrics 101: Mean Time Between Failure (MTBF)
NEW QUESTION # 24
Which one of the following is an example of Direct Cost?
- A. Negative public relations
- B. Legal fees
- C. Reduced customer satisfaction
- D. Damaged brand perception
Answer: B
Explanation:
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
NEW QUESTION # 25
Which design consideration should be implemented with an Inergen-based fire suppression system?
- A. To use Inergen only for fires which are not related to electrical power.
- B. Install the gas containers (tanks) close to the data centre.
- C. Pressure relief valves are required in the room that needs protection.
- D. Install protective covers around the nozzles to avoid accidental gas dumps.
Answer: C
Explanation:
A design consideration that should be implemented with an Inergen-based fire suppression system is to install pressure relief valves in the room that needs protection. Inergen is a clean agent fire suppression system that uses a mixture of inert gases (nitrogen, argon, and carbon dioxide) to displace the oxygen in the room and extinguish the fire. However, when Inergen is released into the room, it creates a sudden increase in pressure, which can damage the walls, doors, windows, and ceilings of the room. To prevent this, pressure relief valves are required to vent the excess pressure to the outside and maintain a safe pressure level inside the room.
Pressure relief valves should be designed and installed in accordance with the relevant standards and codes, such as NFPA 2001 and ISO 14520.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Data Center Fire Suppression Systems Bring Unexpected Risk3, page 1, section 1 4: Inergen from Fire Eater - CSC Datacenter5, page 1, section 1 6:
Inergen Fire Suppression System7, page 1, section 1
NEW QUESTION # 26
Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?
- A. Class D
- B. Class B
- C. Class A
- D. Class K
Answer: C
Explanation:
According to the CDCP® Preparation Guide, Class A fires involve ordinary combustible materials such as paper, wood and cloth. These materials leave behind ash or embers when they burn. Class A fires can be extinguished by water or other cooling agents that reduce the temperature of the fuel below its ignition point.
References: CDCP® Preparation Guide, page 30. Basics of Fire Protection in a Data Center. 3 Levels of Data Center Fire Protection Standards. Three Levels of Data Center Fire Protection.
NEW QUESTION # 27
The expected time to Recover/Repair from a system from a failure is defined as.
- A. MCBF
- B. MTBF
- C. MTTR
- D. MLBF
Answer: C
Explanation:
The expected time to recover or repair from a system from a failure is defined as MTTR (mean time to recovery or mean time to repair). MTTR is the average time it takes to restore a system or product to its normal operation after a failure. MTTR includes the time spent on detecting, diagnosing, and fixing the problem. MTTR is an important metric for measuring the reliability and availability of a system or product, as well as the efficiency and effectiveness of the incident management process. A lower MTTR indicates a faster and more reliable recovery or repair process.
References:
*EPI Data Centre Professional (CDCP®) Preparation Guide, page 17
*What is MTTR? | IBM
*Explained: All Meanings of MTTR and Other Incident Metrics
NEW QUESTION # 28
Which formula can be used to define risk?
- A. Risk = Impact * Probability
- B. Risk = Time * Quality
- C. Risk = Security * Criminality
- D. Risk = Probability * Cost
Answer: A
Explanation:
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
NEW QUESTION # 29
What is the best practice for cutting holes in the raised floor tile?
- A. Cut the tiles at the corner so the pedestals can be used as a vertical cable manager.
- B. Anywhere as data centre tiles are designed to allow cut-outs anywhere.
- C. Draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners.
- D. Draw a line in the middle of the tile and never touch the line when making the cut.
Answer: C
Explanation:
According to the Raised Floor Installation Manual, the best practice for cutting holes in the raised floor tile is to draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners1. This ensures that the structural integrity and load-bearing capacity of the tile are not compromised. Cutting holes anywhere, touching the line, or cutting the corners can weaken the tile and cause it to crack or collapse1. Additionally, the manual recommends using a drill press or a reciprocating saw with a metal or bi-metal cutting blade, and deburring all sharp edges1.
References: 1: Raised Floor Installation Manual, E. Recommended Cutting Tools, Page 1
NEW QUESTION # 30
What is the purpose of a service corridor?
- A. To create a secure and conditioned environment where media can be stored in a controlled manner.
- B. It is a generic name for pathways leading to other rooms that contains facility supporting equipment like the UPS room, battery room, generator room etc.
- C. It provides a safe, vented and secure area where standby generators can operate safely.
- D. It provides a secure area where supporting facilities can be serviced and monitored on a 24x7 basis without disturbing the computer room.
Answer: D
Explanation:
A service corridor is a dedicated space within or adjacent to a data centre that allows access to the supporting facilities, such as power, cooling, fire suppression, security, and cabling systems, without interfering with the computer room operations. A service corridor helps to isolate the noise, vibration, heat, and dust generated by the supporting facilities from the sensitive equipment in the computer room. A service corridor also enhances the safety and efficiency of the maintenance and monitoring activities, as well as the flexibility and scalability of the data centre design.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, Service Corridors Definition | Law Insider
NEW QUESTION # 31
An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?
- A. The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.
- B. The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.
- 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 actual diameter cable including the buffer and jacket.
Answer: B
Explanation:
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
NEW QUESTION # 32
What should be a consideration when having casters (rollers/wheels) or feet under the rack?
- A. Casters and feet should be of a soft material, for example rubber, to avoid damage to the raised floor tile.
- B. Casters and feet should not be locked to ensure the racks are still able to be moved to another position.
- 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.
Answer: D
Explanation:
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
NEW QUESTION # 33
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 cause issues for the cooling of back-up generators.
- C. Failure to the water supply could result in DX cooling systems to fail.
- D. Failure to the water supply could result in sudden changes of the relative humidity in the Computer room.
Answer: B
Explanation:
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
NEW QUESTION # 34
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