[Nov 30, 2025] CDCP Exam Brain Dumps - Study Notes and Theory
Pass EXIN CDCP Test Practice Test Questions Exam Dumps
NEW QUESTION # 11
The expected time to Recover/Repair from a system from a failure is defined as.
- A. MLBF
- B. MCBF
- C. MTBF
- 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 # 12
Which type of copper wire is used for grounding the racks to the SRG?
- A. Thin copper cable to keep the cost low for grounding.
- B. Braided copper wire or flat copper strip.
- C. Copper cable with plastic insulation (isolation).
- D. Thick copper cable to create better grounding.
Answer: B
Explanation:
The type of copper wire that is used for grounding the racks to the SRG (signal reference grid) in a data centre is braided copper wire or flat copper strip, according to the CDCP Preparation Guide1 and various web sources234. Braided copper wire or flat copper strip are preferred over thin or thick copper cable for grounding purposes, because they havelower impedance and higher surface area, which allow better dissipation of electrical noise and interference. Moreover, braided copper wire or flat copper strip are more flexible and durable than copper cable, which make them easier to install and maintain. Braided copper wire or flat copper strip should be connected to the SRG using exothermic welding or other code-compliant methods, and should follow the relevant standards and codes, such as ANSI/TIA/EIA-607 and NFPA 70.
References:
1: CDCP Preparation Guide, page 23, section 2.4.2 2: Signal Reference Grid | Enterprise Data Center Design and Methodology5, page 1, section 1 3: Grounding System Ground Rod Stacking Installation - Rain Bird6, page 1, section 1 4: SmartRack Copper Bus Grounding Bar - Eaton Website7, page 1, section 1
NEW QUESTION # 13
Which Class of Fires involves cooking appliances?
- A. Class K
- B. Class B
- C. Class A
- D. Class C
Answer: A
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 # 14
Mean time between failures is best considered a measure of:
- A. Cost
- B. Duration
- C. Size
- D. Reliability
Answer: D
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 # 15
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 bottom of the rack.
- D. The front door in a downflow direction.
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 # 16
Which one of the following is a factor that can affect Availability and Reliability?
- A. Inadequate Cooling
- B. Radio Active Waves
- C. Attenuation
- 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 # 17
Which formula can be used to define risk?
- A. Risk = Security * Criminality
- B. Risk = Impact * Probability
- C. Risk = Probability * Cost
- D. Risk = Time * Quality
Answer: B
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 # 18
Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?
- A. Class A
- B. Class D
- C. Class B
- 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 # 19
What should be taken into consideration when using patch cables?
- A. The patch cable should always be the same or a higher class the structured cable.
- B. Patch cables can only be used in combination with flat patch panels.
- C. The patch cable should always be the same of a lower class the structured cable.
- D. Patch cables can only be used in combination with angled patch panels.
Answer: A
Explanation:
Patch cables of a lower class than the structured cabling can degrade the overall link performance, so it is best practice to use the same or higher class.
References:
CDCP Exam Preparation Guide, Cabling
NEW QUESTION # 20
Can Electro Magnetic Fields (EMF) cause data centre failures?
- A. Yes, high levels of EMF can cause data centre failures.
- B. Yes, but only EMF caused by lightning strikes.
- C. No, only power issues will cause data centre failures.
- D. No, only cooling issues will cause data centre failures.
Answer: A
Explanation:
According to the EPI Data Centre Training Framework, EMF is a form of electromagnetic interference (EMI) that can disrupt or damage the normal operation of electronic devices, such as servers, network cables, and IT equipment1. High levels of EMF can be generated by power equipment, cell phones, microwaves, TV and radio signals, etc., and can cause data corruption, data loss, system malfunction, and crashes23. Therefore, EMF can cause data centre failures and affect the availability, performance, and security of the data centre. To prevent or mitigate EMF, data centres should follow the best practices for data centre design, layout, cabling, grounding, shielding, and testing14.
References: 1: EPI Data Centre Training Framework, Module 5: Power, Section 5.4.1: Electromagnetic Interference, Page 5-34 2: EMI in the Data Center: To Shield Or Not ToShield2 3: Electromagnetic Interference in Data Centers: Risks Involved and Its Impact on Information Security4 4: Data Center Electromagnetic Interference and Tier Standards1
NEW QUESTION # 21
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 # 22
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 # 23
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. They are heavy and more noisy.
- C. It needs a separate back-up generator as their autonomy time is less than 60 seconds.
- D. It needs additional cooling infrastructure as high temperatures reduces the lifetime of a Dynamic UPS.
Answer: B
NEW QUESTION # 24
What is the minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems?
- A. 64 cm / 25 inches
- B. 120 cm / 47 inches
- C. 60 cm / 24 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 device that uses circulating chilled water to remove heat?
- A. Computer Room Air Suspension Unit (CRAS)
- B. Computer Room Air System Unit (CRAS)
- C. Computer Room Air Suppression Unit (CRAS)
- D. Computer Room Air Handling Unit (CRAH)
Answer: D
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 # 26
systems are designed specifically to protect the structure of a building.
- A. Pro-inert
- B. Total Flooding
- C. Water sprinkler
- D. Inergen
Answer: C
Explanation:
Water sprinkler systems are designed to protect the structure of a building from fire by suppressing or extinguishing the flames with water. Water sprinkler systems are typically installed in the ceiling or walls of a building and are activated by heat or smoke detectors. Water sprinkler systems can reduce the risk of fire spreading and causing structural damage to the building.
References:
*EPI Data Centre Professional (CDCP) Preparation Guide, page 28
*Fire Protection Systems for Data Centers | EPI
NEW QUESTION # 27
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 sudden changes of the relative humidity in the Computer room.
- D. Failure to the water supply could result in DX cooling systems to fail.
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 # 28
What is the best practice for cutting holes in the raised floor tile?
- A. Anywhere as data centre tiles are designed to allow cut-outs anywhere.
- B. Draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners.
- C. Draw a line in the middle of the tile and never touch the line when making the cut.
- D. Cut the tiles at the corner so the pedestals can be used as a vertical cable manager.
Answer: B
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 # 29
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. Data centres only need to comply to international standards since they are connected to a worldwide international network infrastructure.
- C. Local standards do not to be checked as some countries have too many local standards, which will slow down the data centre construction.
- D. Compliance to only international standards is good enough as most local standards are derived from international standards.
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 # 30
Which one of the following is the last stage in Stages of Combustion?
- A. Flaming Fire
- B. Visible Smoke
- C. Incipient
- D. Intense Heat
Answer: A
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 # 31
Which of statements below is true?
- A. Single-mode cabling is more expensive than multi-mode cabling.
- B. Single-mode cabling can use both LED and laser as a light source.
- C. Multi-mode cabling can cross longer distances.
- D. Multi-mode cabling is more expensive than single-mode cabling.
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 # 32
Which type of Humidifier rapidly vibrates waster to create a fog or mist?
- A. Water Canister Humidifier
- B. Infrared Humidifier
- C. Ultrasonic Humidifier
- D. Steam Canister Humidifier
Answer: C
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 # 33
Which Class of Fires involves ordinary combustible materials such as paper, wood and cloth?
- A. Class A
- B. Class D
- C. Class B
- 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 # 34
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 # 35
New server equipment is arriving at your data centre, where should it be tested?
- A. In the Holding area
- B. In the Computer! Server room
- C. In the Media storage area
- D. In the Staging room
Answer: D
Explanation:
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
NEW QUESTION # 36
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