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NEW QUESTION # 22
is the ability of a system or component to perform its required functions under stated conditions for a specified period of time.
- A. Availability
- B. Agility
- C. Scalability
- D. Reliability
Answer: D
Explanation:
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
NEW QUESTION # 23
Which of statements below is true?
- A. Single-mode cabling can use both LED and laser as a light source.
- B. Multi-mode cabling is more expensive than single-mode cabling.
- C. Single-mode cabling is more expensive than multi-mode cabling.
- D. Multi-mode cabling can cross longer distances.
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 # 24
What is the minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems?
- A. 120 cm / 47 inches
- B. 60 cm / 24 inches
- C. 64 cm / 25 inches
- D. 46 cm / 18 inches
Answer: D
Explanation:
The minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems is 46 cm / 18 inches, according to the CDCP Preparation Guide1 and OSHA regulation 29 CFR
1910.159 © (10)2. This clearance space is necessary to ensure that the sprinkler spray or gas discharge can reach the fire and cover the protected area effectively. Any material or obstruction below this clearance space can interfere with the sprinkler or gas distribution and reduce the fire suppression performance. Therefore, building owners and managers should ensure that all storage and objects in the data centre are kept below this clearance space, and that the clearance space is maintained at all times.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Clarification of OSHA regulation 29 CFR
1910.159©(10), Sprinkler ...3, page 1, section 1
NEW QUESTION # 25
Which one of the following is a core objective of a Business Value in an organization?
- A. None of the above
- B. Increasing Sales
- C. Reducing the Deficit
- D. Reducing Costs
Answer: A
Explanation:
According to the EPI Data Centre Professional (CDCP®) Reference Materials, a core objective of a Business Value in an organization is to create value for customers and stakeholders1. This means delivering products or services that meet or exceed customer expectations, while also generating profits or benefits for the organization and its shareholders. Reducing costs, reducing the deficit, and increasing sales are possible ways to achieve this objective, but they are not the core objective itself.
References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 9.
NEW QUESTION # 26
is the degree to which a system or component is operational and accessibility when required for use.
- A. Reliability
- B. Agility
- C. Scalability
- D. Availability
Answer: D
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 # 27
What is a disadvantage of a Dynamic UPS?
- A. They are only available for small to medium sized data centres, due to their limited capacity of 200 kVA
- B. It needs a separate back-up generator as their autonomy time is less than 60 seconds.
- C. They are heavy and more noisy.
- D. It needs additional cooling infrastructure as high temperatures reduces the lifetime of a Dynamic UPS.
Answer: C
NEW QUESTION # 28
By what are magnetic fields of the type 'H' or 'B' created?
- A. Magnetic fields are created by voltage; the greater the voltage, the stronger the magnetic field.
- B. Magnetic fields are created when an electric current flows; the greater the current, the stronger the magnetic field.
- C. Magnetic fields are created by the magnetic flux of the earth which varies per month.
- D. Magnetic fields are created when there is a high level of common mode noise (CMN); the greater the common mode noise (CMN), the stronger the magnetic field.
Answer: B
Explanation:
According to the CDCP Preparation Guide1, magnetic fields of the type 'H' or 'B' are created when an electric current flows through a conductor, such as a wire or a coil. The magnetic field strength 'H' is proportional to the current 'I' and the number of turns 'N' of the coil, and inversely proportional to the length
'l' of the coil. The magnetic flux density 'B' is proportional to the magnetic field strength 'H' and the permeability '' of the medium in which the magnetic field exists. The greater the current, the stronger the magnetic field and the magnetic flux density. The relationship between 'H', 'B', 'I', 'N', 'l', and '' can be expressed by the following equations:
H = N I / l
B =H
References:
1: CDCP Preparation Guide, page 23, section 2.4.2.1 2: Difference between B and H in magnetic fields?3, page 1, section 1 4: Magnetic field | Definition & Facts5, page 1, section 1
NEW QUESTION # 29
The three elements of the fire triangle are,and. (Choose three.)
- A. Oxygen
- B. Earth
- C. Water
- D. Heat
- E. Fuel
Answer: A,D,E
Explanation:
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.
NEW QUESTION # 30
Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?
- A. Class A
- B. Class D
- C. Class C
- D. Class B
Answer: B
Explanation:
Class D fires involve combustible metals or combustible metal alloys such as magnesium, sodium and potassium. These metals can react violently with water, air, or other chemicals, and require special extinguishing agents1 References: 1: EPI Data Centre Professional (CDCP®) Reference Materials, page 16.
NEW QUESTION # 31
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 battery management system to monitor and prevent unsafe temperatures during charging/discharging.
- C. A proper supply of distilled water.
- D. A proper ventilation system since Lithium-ion batteries produce highly flammable Hydrogen gas during charging.
Answer: B
Explanation:
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
NEW QUESTION # 32
Do I need to check the local standards if I already comply to international standards?
- A. Compliance to only international standards is good enough as most local standards are derived from international standards.
- B. You need to check the local standards to ensure compliance to these 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: B
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 # 33
A UPS has an internal battery tester, do you still need to separately test the batteries at block level?
- A. Yes, the UPS will only test the batteries at string level which only gives an indication on the overall status of the battery string. Measurements at block level will provide more detailed information on the status and remaining lifetime of the batteries itself.
- B. Testing batteries using the built-in battery tester or resting the batteries at block level does not increase the battery lifetime, therefore it is not recommended.
- C. No, the UPS will automatically generate and alarm when de battery voltage is too low to operate.
- D. No, as mentioned the battery tester is already built-in the UPS.
Answer: A
Explanation:
Block-level testing identifies weak or failing individual batteries that may not show up in string-level tests, enhancing overall system reliability.
References:
CDCP Exam Preparation Guide, Power/UPS Maintenance
NEW QUESTION # 34
What is the main advantage of busbar trunking compared to stand electrical cabling?
- A. Busbar trunking is less expensive.
- B. Busbar trunking allows for flexibility.
- C. Busbar trunking has a fixed power rating.
- D. Busbar trunking can be located both overhead and under the raised floor.
Answer: B
Explanation:
Busbar trunking systems are a method of power distribution using rigid copper or aluminium conductors to distribute the power around a building. Busbar trunking systems have many advantages over cables, such as lower space requirements, higher short-circuit strength, lower fire load, and easier installation. One of the main advantages of busbar trunking is that it allows for flexibility in terms of power transmission and distribution. Busbar trunking systems can be easily relocated, modified, or expanded to accommodate changes in the building layout or load demand. Busbar trunking systems can also be fitted with various components, such as tap-off units, elbows, tees, and end feed units, to provide power to different locations and consumers.
Busbar trunking systems can also be installed both overhead and under the raised floor, depending on the design and preference of the building.
References: Why I prefer busbar trunking systems more than cables | EEP, Why should you choose Busbar over Cable? - E+I Eng, Busbar VS Cables for Riser Applications - An Electrical Engineer.
NEW QUESTION # 35
The expected time to Recover/Repair from a system from a failure is defined as.
- A. MLBF
- B. MTBF
- C. MCBF
- D. MTTR
Answer: D
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 # 36
Which source is used in fiber cable to transmit data?
- A. Light
- B. Signals
- C. Pulse
- D. Electric
Answer: A
Explanation:
Fiber-optic cables use light as the source to transmit data. Light pulses are modulated to carry information through an optical fiber. The light is confined in the core of the fiber by total internal reflection at the core-cladding interface. The light travels along the fiber with minimal loss or interference, making it suitable for long-distance and high-bandwidth applications.
References: EPI Data Centre Training Framework, Principle of Data transmission through fiber optic cables, Fiber-optic communication
NEW QUESTION # 37
Looking from within the Computer room, what should the door-swing (opening) direction be?
- A. Depends on the type of Computer room
- B. Inwards, code permitted
- C. Outwards, code permitted
- D. Instead of swinging doors, sliding doors are preferred
Answer: C
Explanation:
For safety and emergency egress, doors should swing outwards (towards the exit). This is a common building code and best practice in data centers.
References:
CDCP Exam Preparation Guide, Security and Safety
NEW QUESTION # 38
Which one of the following is used in Measuring Business Value?
- A. Reliability
- B. Regeneration Cost
- C. Scalability
- D. Upfront Cost
Answer: C
Explanation:
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
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