CDCS試験参考書、EXIN EPI Certified Data Centre Specialist CDCS練習テスト

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EXIN CDCS 認定試験の出題範囲：

トピック	出題範囲
トピック 1	データ センターのライフ サイクルと標準: 試験のこのセクションでは、データ センターの専門家のスキルを測定し、計画と設計から実装と廃止まで、データ センターのライフ サイクルに関係するさまざまな段階をカバーします。
トピック 2	データ センターの設計と実装: このモジュールの試験では、データ センターの設計と実装を担当する Exin データ センター プロフェッショナルの知識を評価します。受験者は、スケーラビリティ、冗長性、セキュリティの考慮など、効率的なデータ センター レイアウトを作成するための重要な原則を学習します。
トピック 3	データ センターの環境配慮と効率: このセクションでは、データ センター運用における環境要因への対応と効率化の促進に関するデータ センター専門家の能力を評価します。データ センター管理者やエンジニアなどの対象者は、エネルギー効率、冷却管理、持続可能な実践を強化する対策を特定して実装する能力がテストされます。

EXIN EPI Certified Data Centre Specialist 認定 CDCS 試験問題 (Q65-Q70):質問 # 65
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. Yes, the design of the racks has an influence on the fire suppression system design.
• B. No, cooling and design of racks have no influence on the fire suppression system design.
• C. Only when the rack height obstructs a potential fire suppression release point.
• D. Only when the racks might block access to the fire panel.
  

正解：A
解説：
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.

質問 # 66
Racks with 1.0 m depth and cold aisle containment with 3 perforated tiles are used. What aisle pitch is recommended?

• A. 8 tiles pitch rule
• B. 10 tiles pitch rule
• C. 5 tiles pitch rule
• D. 7 tiles pitch rule
  

正解：D
解説：
The aisle pitch is the total width of a rack row plus cold aisle plus rack row. For 1.0 m racks on each side with cold aisle containment, ASHRAE and TIA-942 recommend the 7-tile rule (each tile ~0.6 m). This ensures enough width for equipment clearance, airflow distribution, and human access.
* 5-tile pitch is too narrow, restricting containment effectiveness.
* 8-10 tiles may be used in some hyperscale layouts but are not standard for 1 m racks.
Thus, the correct design recommendation is the 7 tiles pitch rule.
References: ANSI/TIA-942-B §6.3.6 (Aisle Spacing), ASHRAE TC 9.9 "Airflow Management Best Practices."

質問 # 67
You are installing new copper cabling.
What is the advantage or disadvantage of choosing pre-terminated category 6 or 6A cabling?

• A. Pre-terminated cabling makes ordering of the copper cables more complex, as you need to know in advance on which side the male or female connector needs to be located.
• B. There is no advantage as most new copper cabling network designs are based on category 3 or 5E for horizontal cabling.
• C. Pre-terminated cabling has a higher fire rating.
• D. Pre-terminated cabling is already factory tested and saves installation time.
  

正解：D
解説：
Choosing pre-terminated category 6 or 6A cabling provides several advantages, primarily related to time savings and reliability. Since pre-terminated cables are factory tested, they ensure consistent quality and performance, reducing the need for additional testing during installation. This makes installation faster and more efficient, which can significantly reduce labor costs and deployment times.
Detailed Explanation:
Pre-terminated cabling systems are manufactured and tested in controlled environments, which ensures they meet industry standards for performance. This factory testing process minimizes the likelihood of faults, reducing the need for troubleshooting and retesting on-site. Moreover, pre-terminated solutions can help to streamline installations because they eliminate the need for on-site terminations, which can be time-consuming and require skilled labor.
This is especially beneficial for data centers, where rapid deployment and minimizing potential points of failure are critical to maintaining uptime. However, it is important to note that pre-terminated cables require accurate planning, as lengths and connector configurations must be predetermined.
EPI Data Center Specialist References:
According to EPI Data Center Specialist guidelines, pre-terminated cabling is advantageous in data center environments due to reduced installation time and enhanced reliability from factory testing. These attributes align with best practices for efficient data center management, where maintaining performance and minimizing downtime are priorities.

質問 # 68
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 bus bar trunking
• B. Install single-phase power cabling
• C. Install three-phase power cabling based on a combined cable (e.g. XLPE etc.)
• D. Install three-phase power cabling based on three individual core wires
  

正解：C
解説：
To reduce Electromagnetic Fields (EMF) emanating from the electrical riser near sensitive IT equipment, three-phase power cabling in a combined cable (such as XLPE) is effective. Combined cabling helps reduce EMF by keeping the conductors tightly packed, which minimizes magnetic fields generated by current flow. Cables like XLPE (cross-linked polyethylene) also offer better insulation, which helps mitigate EMF interference with nearby IT equipment.
Detailed Explanation:
Using a combined three-phase cable reduces EMF because the magnetic fields generated by each phase tend to cancel each other out when in close proximity. This arrangement helps reduce the overall magnetic field strength. In addition, XLPE and similar materials provide good insulation, making them a preferred choice for reducing EMF emissions around sensitive equipment.
EPI Data Center Specialist References:
EPI data center best practices recommend mitigating EMF interference through combined cabling arrangements, especially near areas where sensitive IT equipment is located. Reducing EMF is crucial to maintaining equipment reliability and ensuring compliance with safety standards.

質問 # 69
What is the minimum requirement for the power feeds to the building for a Rated-3 data center based on the ANSI/TIA-942 standard?

• A. Two feeds coming from two different substations, one power company is not acceptable
• B. One feed from one substation split over two separated distribution boards in separate rooms
• C. Two feeds coming from two different substations, one power company is acceptable
• D. Two feeds entering the data center building from one substation
  

正解：C
解説：
The minimum requirement for power feeds to a Rated-3 data center according to ANSI/TIA-942 is to have two independent power feeds, which can come from two different substations provided by the same power company. This ensures redundancy and concurrent maintainability, as each feed can support the load independently during maintenance or failure of the other.
Detailed Explanation:
The separation by two substations ensures resilience in case of a localized outage or substation maintenance, aligning with Rated-3 requirements for uninterrupted operation. ANSI/TIA-942 permits these feeds from a single utility provider as long as they are supplied from distinct substations.
EPI Data Center Specialist References:
EPI underscores the importance of dual power feeds from separate substations for Rated-3 facilities, highlighting that the ability to draw from different substations aligns with redundancy requirements for high availability.

質問 # 70
......
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