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EXIN CDCS 認定試験の出題範囲:
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EXIN EPI Certified Data Centre Specialist 認定 CDCS 試験問題 (Q13-Q18):
質問 # 13
What is a potential disadvantage of using water mist as a fire extinguishing system?
- A. It only uses 10% of the water normally used in a water-based fire suppression, which might not be enough to suppress the fire
- B. It extracts oxygen from the air creating a potential risk for humans inside the computer room
- 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
正解:D
解説:
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.
質問 # 14
Which gas-based system in general requires a larger amount of gas in order to be effective, a halocarbon gas- based fire suppression system or an inert gas-based fire suppression system?
- A. Inert gas requires a smaller amount of gas compared to halocarbon gas
- B. Inert gas requires a larger amount of gas compared to halocarbon gas
- C. Impossible to answer without knowing the temperature
- D. Inert gas and halocarbon gas require the same amount of gas
正解:B
解説:
Inert gas systems (e.g., Inergen, Argonite, Nitrogen) extinguish fire by reducing oxygen concentration, which typically requires reducing oxygen levels to ~12-15%. This means a very large volume of gas must be discharged into the room (up to 40-50% of the protected volume). Because inert gases have a low extinguishing effectiveness by weight, more total gas is required.
Halocarbon agents (FM-200, Novec 1230) extinguish fire chemically by interrupting the combustion chain reaction. They require only a small percentage (6-9%) concentration in the room volume. As a result, the storage space for cylinders is much smaller compared to inert gas systems.
Therefore, inert gas systems generally require a larger gas volume to achieve extinguishing concentrations.
References: NFPA 2001 §5.4 (Agent Quantities), ISO 14520-1 §5.3, EXIN DCS Study Guide - Fire Suppression.
質問 # 15
Which class of UPS is ideal for data centers?
- A. VFI (Voltage and Frequency Independent)
- B. VI (Voltage Independent)
- C. First class
- D. VFD (Voltage and Frequency Dependent)
正解:A
解説:
IEC 62040 defines UPS topologies:
* VFD: Line-interactive; dependent on mains.
* VI: Stabilizes voltage but not frequency.
* VFI: Double-conversion online; fully isolates output from mains fluctuations.
Data centers require continuous, clean, and stable power. VFI is the only topology that protects against both voltage and frequency disturbances, meeting ANSI/TIA-942 Rated-3/4 requirements.
Thus, VFI is the ideal UPS class.
References: IEC 62040-3, ANSI/TIA-942-B §6.2.
質問 # 16
What is the main disadvantage of using a ToR (Top of Rack) design?
- A. You need a separate rack to install all your ToR (Top of Rack) switches.
- B. A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch.
- C. A ToR (Top of Rack) switch has only optical interfaces.
- D. There will be more switches to manage.
正解:D
解説:
A Top of Rack (ToR) design typically requires more switches because each rack has its own switch to manage network connections, as opposed to End of Row (EoR) or centralized designs, which consolidate switches. While ToR designs improve cabling efficiency and reduce latency, they also increase the number of switches, thus raising management complexity and potentially increasing capital and operational costs.
Detailed Explanation:
In a ToR setup, each rack's individual switch allows for quick access and streamlined cabling within the rack. However, this setup means more devices to configure, monitor, and maintain, which can increase administrative overhead and network management complexity.
EPI Data Center Specialist References:
EPI documentation notes that ToR designs can improve performance but also lead to increased management needs due to the higher switch count, making them less ideal in environments where simplified network management is prioritized.
質問 # 17
Smoke sensors must be installed in the computer room. What is the minimum density?
- A. 1 per 10 m²
- B. 1 per 25 m²
- C. 1 per 40 m²
- D. 1 per 5 m²
正解:B
解説:
NFPA 75 (Standard for IT Equipment Protection) and NFPA 72 (Fire Alarm Code) recommend installing at least one smoke detector per 250 ft² (#25 m²) in IT rooms. This ensures early detection in high-value environments.
* A and B are far too dense, exceeding NFPA minimums.
* D is too sparse and would not meet early detection requirements.
Therefore, the correct standard density is 1 per 25 m².
References: NFPA 75 §5.4.3, NFPA 72 Table 17.6.3.5.1.
質問 # 18
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