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[Hardware] 2026 Trustable CDCS Exam Material | 100% Free EXIN EPI Certified Data Centre Spe

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【Hardware】 2026 Trustable CDCS Exam Material | 100% Free EXIN EPI Certified Data Centre Spe

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EXIN EPI Certified Data Centre Specialist Sample Questions (Q85-Q90):NEW QUESTION # 85
What is a potential disadvantage of using water mist as a fire extinguishing system?
  • A. It extracts oxygen from the air creating a potential risk for humans inside the computer room
  • B. It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire
  • C. It has droplets that are too small (100-120 microns) so it can only be used for small fires
  • D. It will rapidly increase the humidity level in the data center, which can cause a potential risk for the operation of the equipment
Answer: D
Explanation:
A potential disadvantage of using a water mist fire suppression system is that it can rapidly increase the humidity within the data center, which may pose risks to sensitive electronic equipment. Excessive humidity can lead to condensation, which could damage electronics and lead to short circuits or corrosion over time.
Detailed Explanation:
Water mist systems use fine droplets to suppress fires by cooling and displacing heat. However, the moisture generated may raise the humidity level to the point where it exceeds safe operational limits for IT equipment. Therefore, while water mist systems are effective in fire suppression, they may not be ideal in environments where high humidity could damage sensitive equipment.
EPI Data Center Specialist References:
EPI guidelines advise considering the impact of humidity from fire suppression systems, particularly in environments housing electronic equipment. It's essential to weigh the benefits of fire suppression against potential risks to operational equipment when choosing suppression methods.

NEW QUESTION # 86
A customer requires THDi from the UPS not to exceed 3% and wants high efficiency. The UPS has a 6-pulse SCR/thyristor rectifier and is loaded ~80%. Many ICT changes are expected in the next 3 years. What should you recommend?
  • A. Install a passive harmonic filter on the UPS
  • B. Install an active harmonic filter on the UPS
  • C. Install an isolation transformer rated K13 or K20
  • D. Nothing; the UPS will keep THDi at the right levels
Answer: B
Explanation:
A 6-pulse thyristor rectifier typically produces 25-35% THDi at nominal load. To reach #3% THDi, an active harmonic filter (or a 12/18-pulse or IGBT rectifier UPS) is required. Passive filters are load-specific and less effective over a wide operating range-undesirable with frequent changes.
References: IEEE 519-2014 (harmonic current limits), UPS vendor application notes (6-pulse vs IGBT rectifier THDi), ANSI/TIA-942-B Annex (power quality).

NEW QUESTION # 87
A 5kW (power consumption) server keeps crashing with the message 'temperature too high'.
The intake temperature is measured at 25 °C/77 °F and a relative humidity (RH) level of 50%.
The exhaust temperature is 29 °C/84 °F and 45% RH.
The raised floor is providing an adequate amount of CFM/CMH at a reasonable velocity.
The pressure under the raised floor is approximately 25 Pa/0.1 inch H₂O.
Analyze the situation and indicate what the most likely cause is for this server to crash.
  • A. No cause could be determined as the CFM/CMH of the air conditioning equipment is not stated
  • B. The raised floor pressure is too low and/or the raised floor tile % opening is not adequate
  • C. Dust inside the server causing issues with convection-based heat transfer
  • D. The exhaust temperature is exceeding the ASHRAE recommended values
Answer: C
Explanation:
The server's repeated overheating despite adequate intake and exhaust temperatures suggests that dust buildup inside the server may be impeding heat transfer. Dust accumulation can obstruct airflow within the server, insulate components, and disrupt the convection-based cooling systems that regulate internal temperatures, leading to overheating and potential hardware failures.
Detailed Explanation:
While the intake and exhaust temperatures appear within acceptable ranges, internal dust can reduce airflow and impede cooling efficiency, causing internal components to overheat despite seemingly normal ambient conditions. Regular cleaning and maintenance are critical for preventing dust-related issues, especially in high-powered equipment like a 5kW server.
EPI Data Center Specialist References:
EPI emphasizes regular maintenance to prevent dust buildup in data center equipment. Dust can significantly impact cooling efficiency and lead to overheating, which underlines the importance of routine cleaning for optimal server performance.

NEW QUESTION # 88
When designing a data center network, your company wants to minimize the number of network cables to install. What type of physical cabling layout would be the best choice?
  • A. Top of Rack (ToR) design
  • B. End of Row (EoR) design
  • C. It does not matter as the number of switches is not influenced by the physical cabling layout
  • D. Star network design using coaxial cables
Answer: A
Explanation:
The Top-of-Rack (ToR) cabling layout places an access switch directly inside each rack. Each server in that rack only requires a short patch cable to connect to the switch, and only one or two uplinks per rack connect to aggregation switches. This greatly reduces the number of long horizontal cables across the data hall.
In contrast, an End-of-Row (EoR) design centralizes switches at the row end, requiring long horizontal cables from each server to the row cabinet. This can lead to thousands of extra copper or fiber runs in large deployments.
ANSI/TIA-942 and Cisco Design Guides emphasize that ToR is the best solution for minimizing cable bulk, improving airflow, and reducing cost in hyperscale or dense rack environments.
Thus, if the explicit design goal is to minimize cable quantity, ToR design is superior.
References: ANSI/TIA-942-B §8.2 (Cable Topologies: ToR, MoR, EoR), Cisco Data Center Access Layer Design Guide.

NEW QUESTION # 89
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. Only when the rack height obstructs a potential fire suppression release point.
  • B. Yes, the design of the racks has an influence on the fire suppression system design.
  • C. No, cooling and design of racks have no influence on the fire suppression system design.
  • D. Only when the racks might block access to the fire panel.
Answer: B
Explanation:
The design and configuration of racks, particularly high-density and closed-circuit cooling racks, directly impact the fire suppression system design. Closed-circuit cooling racks, like blade-center racks, can affect airflow and potentially trap heat, influencing how fire suppression agents are distributed within the space. Therefore, it is essential to inform the fire suppression system supplier about the rack design to ensure effective coverage and proper agent distribution.
Detailed Explanation:
High-density racks can change how smoke and heat travel, which in turn affects fire detection and suppression. Closed racks with built-in cooling can isolate airflow, requiring adjustments in fire suppression design to ensure that suppression agents reach all necessary areas, including within enclosed spaces. The supplier may need to account for these factors to ensure proper protection coverage.
EPI Data Center Specialist References:
The EPI Data Center Specialist training underscores that fire suppression systems must be tailored to the specific environmental characteristics of the data center. The design of racks, particularly high-density configurations, should always be considered to ensure that suppression agents can effectively control a fire, even in contained rack spaces.

NEW QUESTION # 90
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