Ultimate Guide to Prepare CDCP Certification Exam for EPI Data Centre in 2026
Use Real CDCP Dumps - EXIN Correct Answers updated on 2026
NEW QUESTION # 53
Which one of the following is the last stage in Stages of Combustion?
- A. Intense Heat
- B. Incipient
- C. Flaming Fire
- D. Visible Smoke
Answer: C
Explanation:
The last stage in stages of combustion is flaming fire, which occurs when the fuel vapors and oxygen are mixed in the right proportion and ignited by a flame or a spark. Flaming fire is characterized by visible flames, intense heat, and rapid oxidation. Flaming fire can cause severe damage to the data center equipment, personnel, and business continuity. Therefore, it is important to prevent or suppress flaming fire as soon as possible using appropriate fire detection and suppression systems.
References:
*EPI Data Centre Professional (CDCP) Preparation Guide, page 31
*[Fire Detection and Suppression Systems for Data Centers]
NEW QUESTION # 54
is the arithmetic mean of time between the failing and the subsequent running of the system in a particular time period.
- A. MCBF
- B. MLBF
- C. MTTR
- D. MTBF
Answer: D
Explanation:
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
NEW QUESTION # 55
Which one of the following is a factor that can affect Availability and Reliability?
- A. Inadequate Cooling
- B. Attenuation
- C. Radio Active Waves
- D. Employee Salaries
Answer: A
Explanation:
Availability and reliability are two important aspects of data centre performance that measure how often the system is operational and how dependable it is. According to the EPI Data Centre Framework, availability is the percentage of time that a system or component is in an operable state, while reliability is the probability that a system or component will perform its required function under given conditions for a specified period of time. Both availability and reliability can be affected by various factors, such as design, maintenance, human error, power supply, security, etc. One of the factors that can have a significant impact on both availability and reliability is cooling. Cooling is essential for maintaining the optimal temperature and humidity levels for the IT equipment and preventing overheating, which can cause failures, downtime, and reduced lifespan.
Inadequate cooling can result from insufficient capacity, poor airflow management, faulty components, or environmental conditions. Inadequate cooling can reduce the availability and reliability of the data centre by increasing the risk of thermal stress, hot spots, performance degradation, and equipment damage. Therefore, cooling is a critical factor that can affect availability and reliability in a data centre.
References:
*EPI Data Centre Framework1
*EPI Data Centre Training Framework2
*EPI Data Centre Competence Framework3
*Data Center Availability, Reliability Hinge On Numerous Factors4
*A Look at Data Center Reliability and Availability5
NEW QUESTION # 56
Which one of the following is an Objective of Data Center Fire Protection?
- A. Representation
- B. Depression
- C. Suppression
- D. Information
Answer: C
Explanation:
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
NEW QUESTION # 57
How many monitoring points should be used in Temperature Measurement?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
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 # 58
When designing a data centre with a raised-floor setup, where should the air conditioners be placed?
- A. Perpendicular to the hot aisle
- B. Close to the entrance door to create an air curtain to avoid hot comes into the computer room
- C. Perpendicular to the cold aisle
- D. Perpendicular to the side of the rack
Answer: A
NEW QUESTION # 59
Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?
- A. Class C
- B. Class B
- C. Class D
- D. Class A
Answer: C
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 # 60
Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?
- A. Class A
- B. Class B
- C. Class D
- D. Class K
Answer: A
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 # 61
Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?
- A. Class C
- B. Class B
- C. Class D
- D. Class A
Answer: C
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 # 62
When dealing with glass door racks, cool air is injected into the rack from:
- A. The rear door in a downflow direction.
- B. The top of the rack through the fans and vents mounted inside the rack.
- C. The front door in a downflow direction.
- D. The bottom of the rack.
Answer: A
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 # 63
Starting from which Rating does the requirement of Concurrently Maintainability becomes relevant?
- A. Rated-3
- B. Rated-2
- C. Rated-4
- D. Rated-1
Answer: A
Explanation:
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
NEW QUESTION # 64
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 Technology
- B. The Fire Hexagon
- C. The Fire Triangle
- D. The Fire Class
Answer: C
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 # 65
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. The casters and feet should be larger to avoid a too heavy point load on the floor tile.
- C. Skirts at the bottom of the rack to avoid air flow between the hot and cold aisles.
- D. Casters and feet should not be locked to ensure the racks are still able to be moved to another position.
Answer: B
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 # 66
An optical fiber cable comes with the specifications 50/125 um.
What do the numbers represent?
- A. The first number represents the distance for a 10 Gb/s connection; the second number represents the distance for a 1 Gb/s connection.
- B. The first number represents the diameter of the core; the second number represents the actual diameter cable including the buffer and jacket.
- C. The first number represents the diameter of the core; the second number represents the diameter of the cladding in microns.
- D. The first number represents the required distance to single-phase power cabling; the second number represents the required distance to three-phase cabling.
Answer: C
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 # 67
Sprinkler heads used in computer rooms activate at what temperature?
- A. 70 C (158 °F)
- B. Only on direct contact with a flame
- C. 57 °C (135 °F)
- D. 27 °C (81 °F)
Answer: C
Explanation:
Sprinkler heads used in computer rooms activate at 57 °C (135 °F), which is the standard temperature rating for ordinary sprinklers. This is the temperature at which the heat-sensitive element of the sprinkler head, such as a glass bulb or a fusible link, breaks or melts, allowing water to flow from the sprinkler. Sprinkler heads are designed to activate only when exposed to a fire, not to ambient temperature fluctuations. Therefore, sprinkler heads should be installed at a sufficient distance from the heat sources, such as servers, racks, or ducts, to avoid accidental activation. Sprinkler heads should also be selected and installed in accordance with the relevant standards and codes, such as NFPA 13 and NFPA 75.
References:
1: CDCP Preparation Guide, page 24, section 2.4.3 2: Sprinkler Systems in Data Centers3, page 1, section 1 4:
Data Center Fire Protection5, page 1, section 2 6: Data Center Sprinkler System Design7, page 1, section 1
NEW QUESTION # 68
What is the main advantage of busbar trunking compared to stand electrical cabling?
- A. Busbar trunking can be located both overhead and under the raised floor.
- B. Busbar trunking is less expensive.
- C. Busbar trunking has a fixed power rating.
- D. Busbar trunking allows for flexibility.
Answer: D
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 # 69
Which type of Fire Detection Device is recommended for protecting a Data Center?
- A. Heat detector
- B. Smoke detector
- C. Flame detector
- D. None of the above
Answer: B
Explanation:
According to the CDCP® Preparation Guide, smoke detectors are the most common type of fire detection devices used in data centers, as they can detect a fire in its early stages and provide early warning to the occupants and authorities. Smoke detectors can be either spot-type or air-aspirating, depending on the design and goals of the data center. Spot-type detectors are inexpensive and simple, but may cause activation delay and false alarms. Air-aspirating detectors are more sensitive and reliable, but may require more maintenance and installation costs. Both types of detectors should be installed in accordance with the relevant standards and codes, such as NFPA 72 and EN 54.
References: CDCP® Preparation Guide, page 30-31. Evaluating Fire Detection Options For Data Centers. Fire Detection and Suppression Systems in a Data Center.
NEW QUESTION # 70
Which of statements below is true?
- A. Single-mode cabling is more expensive than multi-mode cabling.
- B. Multi-mode cabling can cross longer distances.
- C. Multi-mode cabling is more expensive than single-mode cabling.
- D. Single-mode cabling can use both LED and laser as a light source.
Answer: A
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 # 71
The three elements of the fire triangle are,and. (Choose three.)
- A. Heat
- B. Fuel
- C. Earth
- D. Water
- E. Oxygen
Answer: A,B,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 # 72
Which Class of Fires involves cooking appliances?
- A. Class C
- B. Class B
- C. Class K
- D. Class A
Answer: C
Explanation:
According to the EPI Data Centre Professional (CDCP) Preparation Guide, Class K fires involve cooking appliances that use combustible cooking media such as vegetable or animal oils and fats (page 28). Class K fires require special extinguishing agents that can suppress the high-temperature flames and prevent re- ignition. Class K fires are different from Class B fires, which involve flammable liquids such as gasoline, oil, or paint.
References:
*EPI Data Centre Professional (CDCP) Preparation Guide, page 28
*Fire Classes and Extinguishing Agents | The Fire Equipment Manufacturers' Association
NEW QUESTION # 73
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