EXIN CDCS EXIN EPI Certified Data Centre Specialist Online Training
EXIN CDCS Online Training
The questions for CDCS were last updated at Mar 10,2025.
- Exam Code: CDCS
- Exam Name: EXIN EPI Certified Data Centre Specialist
- Certification Provider: EXIN
- Latest update: Mar 10,2025
What is a potential disadvantage of using a hypoxic-based fire suppression system as a fire extinguishing system?
- A . It can only be used in computer rooms which have sufficient air changes per hour.
- B . The gas containers need to be close to the hazard area.
- C . It can only be used in non-continuous occupied areas.
- D . It can only be used in computer rooms where you have sufficient positive pressure.
The humidity in the computer room has changed from about 50% down to 35% Relative Humidity (RH).
What influence does this have on Electrostatic Discharge (ESD)?
- A . No influence as long as the temperature is at approximately 20°C/77°F
- B . Relative humidity has no influence on ESD
- C . ESD levels will go up
- D . ESD levels will go down
A computer room with a raised floor has been designed with racks in a hot/cold aisle setup.
What should you recommend for the placement of down-flow air conditioners?
- A . Air conditioners perpendicular to (at the end of the row of) the Cold-Aisle
- B . Air conditioners perpendicular to (at the end of the row of) the Hot-Aisle
- C . Air conditioners should always be placed at both sides of each row of racks
- D . Air conditioner placement has no influence on cooling effectiveness and efficiency. Hence, they can be placed at any convenient location.
A computer room needs to be fitted out with a gas-based fire suppression system. The computer room will be a high-density data center with about 30% of the racks being closed circuit cooling blade-center racks.
Should the supplier of the fire suppression system be informed on the design of the racks?
- A . No, cooling and design of racks have no influence on the fire suppression system design.
- B . Only when the rack height obstructs a potential fire suppression release point.
- C . Yes, the design of the racks has an influence on the fire suppression system design.
- D . Only when the racks might block access to the fire panel.
The ‘maximum exposed area’ of the fire-rated glass is defined by the supplier as 3 sqm/32 sqft. The window area is 4 sqm/43 sqft.
What would be the best option?
- A . Do not use fire-rated glass due to the size limit and replace it with normal glass.
- B . Split the window in two equal parts using an aluminum frame.
- C . Split the window into parts smaller than specified as the maximum exposed area and ensure fire-rated frames are used.
- D . Split the window in two equal parts fitted together with transparent silicon glue.
A data center scores Rated-3 in mechanical, Rated-4 in electrical, and Rated-2 in architectural.
What is the overall Rating of this data center when the Rating is based on the ANSI/TIA-942?
- A . Rated-2 since that is the lowest rating received
- B . Rated-4 since that is the highest rating received
- C . Rated-4 since electrical is more important than mechanical and architectural
- D . Depends on the Rating scored in telecommunications
The data center has been in operation for about 1 year and 2 months. The dust levels in the computer room are relatively high.
What is the most likely root cause?
- A . The cleaning crew is not doing their work properly
- B . Every computer room has high dust levels due to constant high-speed air movement
- C . Low pressure in the computer room
- D . Floorboards are most likely not fitted correctly
You have three UPS systems connected in parallel. The UPS systems have an imbalance in the load sharing of approximately 20%.
What should you recommend?
- A . Review the cable lengths of each UPS to the common busbar
- B . Nothing, there is no reason for any concern
- C . Review the common mode noise levels within the computer room
- D . Review the harmonics levels within the computer room
You are working on the design of a new facility. The electrical riser of the building with high current power is located close to the area where sensitive IT equipment in the computer room will be located.
What should you recommend to reduce the amount of EMF coming from the electrical riser?
- A . Install single-phase power cabling
- B . Install three-phase power cabling based on three individual core wires
- C . Install bus bar trunking
- D . Install three-phase power cabling based on a combined cable (e.g. XLPE etc.)
The location of a data center is just above the Arctic Circle (North Pole). The outside air temperature is never above 21°C/70°F.
Taking energy efficiency as the highest priority, which cooling system should you recommend?
- A . Standard air conditioning units, as spares might not be readily available
- B . Any cooling system can be efficient because the outside air temperature will not influence the temperature of the air intake of the ICT equipment
- C . Waterside economizer
- D . Airside economizer
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