Get Prepared for Your CDCP Exam With Actual 90 Questions [Q22-Q37]

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Get Prepared for Your CDCP Exam With Actual 90 Questions

Valid CDCP Test Answers Full-length Practice Certification Exams

Q22. An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?

The first number represents the distance for a 10 Gb/s connection; the second number represents the distance for a 1 Gb/s connection.

The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.

The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.

The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.

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

Q23. An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?

The first number represents the distance for a 10 Gb/s connection; the second number represents the distance for a 1 Gb/s connection.

The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.

The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.

The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.

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

Q24. When dealing with glass door racks, cool air is injected into the rack from:

The rear door in a downflow direction.

The front door in a downflow direction.

The top of the rack through the fans and vents mounted inside the rack.

The bottom of the rack.

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.

Q25. What is the main advantage of busbar trunking compared to stand electrical cabling?

Busbar trunking allows for flexibility.

Busbar trunking is less expensive.

Busbar trunking can be located both overhead and under the raised floor.

Busbar trunking has a fixed power rating.

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.

Q26. What is a requirement of an FM200 (HFC-227) installation?

It is a high-pressure gas; therefore nozzles must be mounted with two brackets.

Drainage system under the raised floor.

Install the gas containers (tanks) close to the data centre.

Install pre-action sprinklers in the same room as the FM200.

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

Q27. The three elements of the fire triangle are,and. (Choose three.)

Oxygen

Earth

Heat

Water

Fuel

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.

Q28. Do I need to check the local standards if I already comply to international standards?

Local standards do not to be checked as some countries have too many local standards, which will slow down the data centre construction.

You need to check the local standards to ensure compliance to these standards.

Compliance to only international standards is good enough as most local standards are derived from international standards.

Data centres only need to comply to international standards since they are connected to a worldwide international network infrastructure.

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

Q29. What is the current recommended temperature for ICT equipment as described in the ASHREA TC 9.9 guideline?

8-18 C (46.4 -64.4 °F)

20-40 °C (68 – 104 °F)

18-27 C (64.4 – 80.6°F)

25-45 °C (77 – 113 °F)

The current recommended temperature for ICT equipment as described in the ASHRAE TC 9.9 guideline is
18-27 C (64.4 – 80.6°F). This is the recommended range for the dry-bulb temperature at the inlet of the servers, which is the most critical parameter for ensuring the optimal performance and reliability of the ICT equipment. The recommended range is based on the thermal specifications of the majority of the ICT equipment in the market, as well as the energy efficiency and environmental considerations of the data centre cooling systems. The recommended range is suitable for Classes A1 to A4 of the ASHRAE thermal guideline classes, which cover different types and generations of ICT equipment.
References:
1: 2021 Equipment Thermal Guidelines for Data Processing Environments – ASHRAE2, page 1, Table 2.1 3:
ASHRAE TC9.9 Data Center Power Equipment Thermal Guidelines and Best Practices4, page 10, section 2.1
5: Does your Data Center Follow ASHRAE TC 9.9 Thermal Guidelines for Data Processing Environments?6, page 1, section 1

Q30. What is the main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS)?

An EMS provides local alarms. A BMS provides both local and remote alarms.

A BMS is only able to monitor dry contacts (on/off). An EMS can also monitor analog values.

A BMS only operates as a stand-alone system. An EMS can be configured as a redundant system.

An EMS monitors only. A BMS monitors and controls.

The main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS) is that an EMS monitors only, while a BMS monitors and controls. An EMS is a system that collects and records data from various sensors and devices that measure environmental parameters, such as temperature, humidity, air quality, power, and water. An EMS provides alerts and reports based on the data, but it does not control or adjust the environmental conditions. A BMS is a system that integrates and manages various building systems, such as HVAC, lighting, security, fire, and access. A BMS not only monitors the data from these systems, but also controls and optimizes them to achieve the desired performance and efficiency. A BMS can also communicate with an EMS to receive data and provide feedback.
References:
1: Environmental Monitoring Systems vs Building Management Systems2, page 1, section 1 3: Building Monitoring System vs Environmental Monitoring System4, page 1, section 1 5: BUILDING AND ENVIRONMENTAL MANAGEMENT SYSTEMS AND HOW THEY MEET GMP …6, page 1, section 1 7:
Environmental Monitoring System vs. Building Management System8, page 1, section 1

Q31. Escape route signage should be placed where?

Only at emergency escape doors

Only at the main entrance of the data centre building

At every door providing a pathway

At every door including riser doors, doors of storage closets etc.

Escape route signage should be placed at every door providing a pathway to the exit or the assembly area, according to the CDCP Preparation Guide1 and the EU Safety/Health Signs Directive2. Escape route signage is used to guide the occupants of the data centre fromwherever they are in the building, via a place of relative safety (the escape route), to the place of ultimate safety (the assembly area). Escape route signage should not be limited to only emergency escape doors or the main entrance of the data centre building, as these may not be accessible or visible from all locations. Escape route signage should also not include doors that do not lead to the exit or the assembly area, such as riser doors, doors of storage closets, or doors of other rooms, as these may confuse or mislead the occupants. Escape route signage should be placed at every door that provides a pathway to the exit or the assembly area, and should indicate the direction and distance of the escape route using pictograms, arrows, and words. Escape route signage should also be designed and installed in accordance with the relevant standards and codes, such as BS 5499 and ISO 7010.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: EU Safety/Health Signs Directive3, page 1, section 1

Q32. What is the recommended level of Common Mode Noise (CMN)?

> 10 Volt measured at the rack level

> 5 Volt measured at the rack level

Preferred to be < 1 Volt with a maximum of 3 Volt

CMN has r>o effect on ICTequipment so any level is ok

As per Certified Data Centre Professional (CDCP) reference materials, Common Mode Noise (CMN) is a type of electrical noise that appears equally on the line and neutral wires with respect to ground, and it can negatively affect sensitive ICT equipment. Excessive CMN at the rack level can lead to data errors, communication problems, equipment malfunctions, or even hardware damage.
The CDCP training and the official exam preparation guide specify that the preferred level of Common Mode Noise at the rack should be less than 1 Volt, and under no circumstances should it exceed 3 Volts.
Keeping CMN at these levels helps ensure the stable and reliable operation of critical data center infrastructure. Higher CMN levels indicate grounding or bonding issues, or possibly interference from electrical or mechanical sources, and must be addressed promptly.
Options A and B (CMN above 5 or 10 Volts) are not acceptable and would present a serious risk to ICT equipment operation and data integrity. Option D is incorrect, as CMN absolutely does affect ICT equipment.
:
EPI CDCP Exam Preparation Guide: https://www.epi-ap.com/uploads/file/exam%20prep
/english_preparation_guide_cdcp_202003.pdf
EPI Certified Data Centre Professional (CDCP) Course Content: https://www.epi-ap.com/services/1/3/4
/Certified_Data_Centre_Professional_(CDCP)
EPI Data Centre Framework: https://www.epi-ap.com/content/31/67/EPI_Data_Centre_Framework

Q33. is the ability of a system or component to perform its required functions under stated conditions for a specified period of time.

Scalability

Agility

Reliability

Availability

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

Q34. New server equipment is arriving at your data centre, where should it be tested?

In the Holding area

In the Computer! Server room

In the Media storage area

In the Staging room

New equipment should be unpacked, tested, and configured in a dedicated staging room before being moved to the live data hall to prevent contamination and disruptions.
References:
CDCP Exam Preparation Guide, Staging/Receiving Area

Q35. Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?

Class A

Class B

Class C

Class D

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.

Q36. When referring to the internal mounting space in racks, equipment manufactures generally refer to standardized height of electronic modules “U” or “RU”. What is the height of 1 “U” or “RU”?

19 inches (60 cm)

24 inches (80 cm)

1.75 inches (4.445 cm)

3.5 inches (8.59 crn)

According to the Certified Data Centre Professional (CDCP) Reference Materials, the height of 1 “U” (rack unit) or “RU” (rack unit) is standardized at 1.75 inches, which is equivalent to 44.45 millimeters or 4.445 centimeters. This unit of measurement is globally used to define the internal mounting space in IT and telecommunications racks. Equipment manufacturers specify their devices’ height based on how many “U” the device occupies (for example, a 2U server is 3.5 inches high). The standardization ensures interoperability and planning efficiency within the data center environment.
The “U” (rack unit) system is essential for ensuring that racks and equipment from different manufacturers will fit together properly, facilitating modularity, expansion, and maintenance. The 1.75-inch specification is defined by several industry standards including EIA-310 and is referenced directly in the EPI CDCP training and its official exam preparation guides.
:
EPI CDCP Exam Preparation Guide: https://www.epi-ap.com/uploads/file/exam%20prep
/english_preparation_guide_cdcp_202003.pdf
EPI Certified Data Centre Professional (CDCP) Course Content: https://www.epi-ap.com/services/1/3/4
/Certified_Data_Centre_Professional_(CDCP)
EPI Data Centre Framework: https://www.epi-ap.com/content/31/67/EPI_Data_Centre_Framework EPI Data Centre Competence Framework: https://www.epi-ap.com/content/31/83
/EPI_Data_Centre_Competence_Framework_(EPI-DCCF)
EPI CDCP FAQ
Official standards: EIA-310

Q37. is the arithmetic mean of time between the failing and the subsequent running of the system in a particular time period.

MTBF

MCBF

MLBF

MTTR

MTBF stands for Mean Time Between Failures, and it is the arithmetic mean of time between the failing and the subsequent running of the system in a particular time period. MTBF is a measure of reliability that indicates how often a system or component fails during its operation. MTBF can be calculated by dividing the total operating time by the number of failures over a given period. For example, if a system operates for 1000 hours and experiences 5 failures, the MTBF is 1000/5 = 200 hours.
References: EPI Data Centre Training Framework, CDCP Preparation Guide, MTBF, MTTR, MTTF, MTTA:
Understanding incident metrics – Atlassian

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EXIN CDCP Exam Syllabus Topics:

Topic	Details
Topic 1	Cooling Infrastructure: The topic focuses on liquid immersion cooling, supplemental cooling options, sensible and latent heat definitions, and temperature and humidity recommendations.
Topic 2	Data Centre Location, Building and Construction: It focuses on appropriate sites and components of an effective data centre and supporting facilities setup.
Topic 3	Raised Floor Suspended Ceiling: The topic discusses applicable standards, signal reference grid, and disability act and regulations.
Topic 4	Light: This topic covers light fixture types and placement, emergency lighting, and emergency Power Supply (EPS).
Topic 5	Power Infrastructure: It focuses ATS and STS systems, redundancy levels and techniques, static and dynamic UPS systems, battery types, thermo-graphics, and renewable energy factor (REF).
Topic 6	Physical Security and Safety: Sub-topics are about physical security considerations and physical safety considerations.
Topic 7	Designing a Scalable Network Infrastructure: It covers ANSI TIA-942 cabling hierarchy, network redundancy, structured Cabling System, and planning considerations.
Topic 8	Equipment Racks: It discusses power rail strip options, security considerations, and rack standards, properties and selection criteria.