CDCS予想試験 & CDCS認定資格試験問題集

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EXIN EPI Certified Data Centre Specialist 認定 CDCS 試験問題 (Q59-Q64):

質問 # 59
What is the main reason to install Earth Leakage protection?

A. Protection of ICT equipment against high-frequency noise currents
B. Improvement of the data center grounding/earthing system
C. Protection against lightning strikes
D. Protection of human lives

正解：D

解説：
Earth Leakage Protection is primarily installed to protect human lives by detecting and disconnecting power when a fault current flows to the ground. This type of protection is essential to avoid electrical shock hazards that could occur when insulation fails, or equipment is improperly grounded.
Detailed Explanation:
Earth leakage currents can occur due to insulation faults or accidental contact with live parts. Earth Leakage Protection systems, such as Residual Current Devices (RCDs), quickly detect these faults and disconnect the circuit to prevent harm to personnel. This is especially crucial in environments like data centers where high-powered equipment is continuously running and any electrical fault can pose significant safety risks.
EPI Data Center Specialist References:
EPI emphasizes that human safety is paramount in data center operations. Proper grounding and leakage protection are fundamental safety measures, and EPI guidelines align with this focus, underscoring the importance of protecting personnel from electrical hazards through appropriate safety systems.

質問 # 60
What is the calculation for the desired attenuation factor for shielding material?

A. A = M / R
Where A is Attenuation M is the maximum acceptable value R is the real value measured
B. You do not have to calculate the attenuation factor for shielding material as it always has the same attenuation
C. A = 20 log (M / R)
Where A is Attenuation M is the maximum acceptable value R is the real value measured
D. A = 20 log (R / M)
Where A is Attenuation R is the real value measured M is the maximum acceptable value

正解：D

解説：
The attenuation factor for shielding material is typically calculated using the formula A = 20 log (R / M). This equation provides the attenuation in decibels (dB), where R represents the measured electromagnetic field strength, and M is the maximum acceptable level. The logarithmic scale helps quantify how much the shielding reduces EMF levels relative to the maximum allowable value.
Detailed Explanation:
This formula calculates attenuation by comparing the measured value with the acceptable threshold, with the result expressed in decibels. A higher attenuation indicates more effective shielding material, essential for environments requiring robust EMF management.
EPI Data Center Specialist References:
EPI standards include the use of logarithmic formulas to evaluate attenuation levels, ensuring that shielding materials provide adequate reduction in EMF to protect sensitive equipment within data centers.

質問 # 61
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-4 since electrical is more important than mechanical and architectural
B. Rated-2 since that is the lowest rating received
C. Rated-4 since that is the highest rating received
D. Depends on the Rating scored in telecommunications

正解：B

解説：
According to ANSI/TIA-942 standards, the overall data center rating is determined by the lowest rating among all evaluated categories. Therefore, if a data center is rated 2 in architectural, despite being rated higher in mechanical and electrical, the overall rating is Rated-2. This approach ensures that all aspects meet a minimum standard and prevents a higher rating if any critical area does not comply.
Detailed Explanation:
ANSI/TIA-942 evaluates data centers across several areas, including mechanical, electrical, architectural, and telecommunications. The overall rating reflects the lowest rated category, ensuring that no aspect of the data center's design or operation falls below the specified level. Thus, in this case, the architectural rating of 2 dictates the final rating, ensuring a comprehensive and balanced assessment of reliability and resilience across all aspects.
EPI Data Center Specialist References:
EPI Data Center Specialist training aligns with ANSI/TIA-942, stating that the final rating must reflect the lowest score to ensure comprehensive reliability across all critical infrastructure categories. This avoids overstating the data center's resilience and ensures uniform standards across areas.

質問 # 62
You need to install a highly sensitive fire detection system. The data center has a high airflow rate. Which system should you recommend?

A. Dry pipe sprinkler system
B. Ionization smoke detector
C. Photoelectric smoke detector
D. VIEW (Very Early Warning) smoke detector

正解：D

解説：
Data centers typically have high airflow environments due to CRAC/CRAH units, containment, and raised floors. Standard smoke detectors (ionization or photoelectric) often fail to detect incipient smoke because the air movement disperses particles.
The correct solution is VESDA/VIEW (Very Early Warning) smoke detection systems, which use aspirating smoke detectors (ASD). These systems continuously sample air through pipes and can detect smoke particles at concentrations as low as 0.001% obscuration/m. This provides early detection well before fire growth, allowing mitigation without system shutdown.
* Dry pipe sprinklers (A) are suppression, not detection.
* Ionization detectors (B) are sensitive to flaming fires but unreliable in high-airflow environments.
* Photoelectric detectors (C) are better for smoldering fires but still inadequate in high airflow compared to ASD systems.
References: NFPA 75 §5.4.3, NFPA 76 (Telecom facilities - aspirating systems), ISO 7240-20 (Aspirating Smoke Detectors).

質問 # 63
A data center has its own power supply from the public utility and receives chilled water supply from the building owner.
What needs to be taken into consideration when calculating the PUE?

A. PUE calculations are not possible in shared buildings
B. You will need to take the value for COP of the chiller plant into consideration
C. Nothing, as the chiller plant in the building also uses electrical power
D. You will need to take a weight factor of 0.4 for district chilled water into consideration

正解：D

解説：
When calculating Power Usage Effectiveness (PUE) in a data center that uses chilled water from an external source, like from a building owner, a weight factor for district chilled water must be applied. This is because PUE calculations aim to measure the energy efficiency of the data center's own operations, and external utilities like district chilled water aren't directly powered by the data center. A weight factor of 0.4 is typically used to account for the energy consumed to produce and deliver the chilled water, reflecting the indirect impact on the data center's total energy consumption.
Detailed Explanation:
PUE is calculated as the ratio of the total facility energy to the IT equipment energy. If the cooling is provided by an external chilled water source, it's necessary to adjust the calculations to accurately reflect the energy impact. By incorporating the 0.4 weight factor, data centers can calculate a more accurate PUE, aligning with standard methods and industry best practices.
EPI Data Center Specialist References:
EPI training on PUE highlights the importance of adjusting for external energy sources, such as district cooling, in the calculations. This ensures that PUE values remain accurate and comparable across different data centers, even when external utilities are used.

質問 # 64
......

IT業の多くの人がいくつか認証試験にパスしたくて、それなりの合格証明書が君に最大な上昇空間を与えます。この競争の激しい業界でとんとん拍子に出世させるのはEXINのCDCS認定試験ですが、簡単にパスではありません。でもたくさんの方法があって、最も少ない時間をエネルギーをかかるのは最高です。

CDCS認定資格試験問題集: https://www.it-passports.com/CDCS.html

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はあぁ～うさ晴らししてぇ～後藤がやや大人しくなった為、ツッコむ事もからかう事も減り、ストレスが堪っているのだ、室のすみにある、電話機をのせた車つきの台が、そばへやってきて止まった、CDCS試験トレーニングを使用している限り、試験に合格することができます。

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TopExamというサイトは長年の研究を通して最も全面的な資料を受験者たちCDCSに提供いたします、豊富な内容と1年間の無料アップデート、それに、うちの学習教材を購入したら、私たちは一年間で無料更新サービスを提供することができます。

EXINのCDCS試験は、ITに関する仕事に就職している人々にとって、重要な能力への証明ですが、難しいです。

無料でクラウドストレージから最新のIt-Passports CDCS PDFダンプをダウンロードする：https://drive.google.com/open?id=18i5igYHnrXCwSVe74MvM6LPGBBu2YVIi

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CDCS予想試験 & CDCS認定資格試験問題集

最新のCDCS予想試験 & 合格スムーズCDCS認定資格試験問題集 | 100％合格率のCDCS認定資格

EXIN EPI Certified Data Centre Specialist 認定 CDCS 試験問題 (Q59-Q64):

信頼できるCDCS予想試験 & 合格スムーズCDCS認定資格試験問題集 | 素晴らしいCDCS認定資格