EXIN CDCS題庫更新資訊-最新CDCS考試題庫幫助妳壹次性通過EXIN EPI Certified Data Centre Specialist考試

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EXIN CDCS 考試大綱：

主題	簡介
主題 1	Data Centre Life Cycle and Standards: This section of the exam measures the skills of data center professionals and covers the various stages involved in the life cycle of a data center, from planning and design to implementation and decommissioning.
主題 2	Designing and Implementing a Data Centre: In this module, the exam assesses the knowledge of Exin data center professionals tasked with the design and implementation of data centers. Candidates will learn the key principles of creating an efficient data center layout, including considerations for scalability, redundancy, and security.
主題 3	Data Centre Environmental Considerations and Efficiency: This section evaluates the proficiency of data center professionals in addressing environmental factors and promoting efficiency within data center operations. The target audience, including data center managers and engineers, will be tested on their ability to identify and implement measures that enhance energy efficiency, cooling management, and sustainable practices.

>> CDCS題庫更新資訊 <<

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最新的 EPI Data Centre CDCS 免費考試真題 (Q77-Q82):問題 #77
Racks with 1.0 m depth and cold aisle containment with 3 perforated tiles are used. What aisle pitch is recommended?

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

答案：B
解題說明：
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."

問題 #78
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 an isolation transformer rated K13 or K20
• B. Install an active harmonic filter on the UPS
• C. Nothing; the UPS will keep THDi at the right levels
• D. Install a passive harmonic filter on the UPS
  

答案：B
解題說明：
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).

問題 #79
A data center is located in an area where the demand for power is higher than the utility power company is able to deliver. This results in frequent power outages and, therefore, power shedding (scheduled/controlled power shutdown for areas) is frequently applied. The mains power is more than 650 hours/year not available.
What type of generators should be installed?

• A. Standby generators should be installed in at least an N+1 configuration
• B. Continuous generators should be installed; no N+1 configuration is needed as the generators will run all the time
• C. A combination of standby-, prime-, and continuous-generators, as the duration of the power outage is unpredictable. The total available capacity of the generators should be at least 500% of the data center load
• D. Continuous generators should be installed, at least in an N+1 configuration
  

答案：D
解題說明：
In areas with frequent and extended power outages, continuous generators with at least an N+1 configuration are necessary to ensure consistent power availability. Continuous generators are designed for prolonged operation, making them suitable for scenarios where utility power is frequently unavailable, as in this case with outages exceeding 650 hours per year. An N+1 configuration ensures redundancy, which is critical for maintaining uptime in a high-availability data center.
Detailed Explanation:
Continuous generators provide reliable power over long durations, unlike standby generators, which are intended only for short-term use. The N+1 configuration ensures that there is always an additional generator available in case of failure, thus maintaining power supply even if one generator goes offline.
EPI Data Center Specialist References:
EPI best practices recommend continuous generators with redundancy for data centers located in areas with high power instability to maintain reliability and continuous operation.

問題 #80
The humidity in the computer room has increased from about 60% up to 85% Relative Humidity (RH). What potential risk does this pose to your equipment?

• A. The electrostatic discharge (ESD) levels will go up
• B. The risk of excessive wear and corrosion will increase
• C. There will be a cooling risk due to a high wet bulb temperature
• D. No risks at all
  

答案：B
解題說明：
High relative humidity (above 80%) creates a serious risk for corrosion of electronic contacts, printed circuit boards (PCBs), and metallic components. Moisture in the air condenses more easily, especially when surfaces are cooler than ambient dew point. This can lead to oxidation of connectors, degradation of solder joints, and eventual failures in ICT hardware.
Electrostatic discharge (ESD) risks, by contrast, increase at low humidity (below 30%) because dry air promotes charge buildup. Therefore, option C is incorrect here. Similarly, option D (cooling risk from wet- bulb temperature) applies to evaporative cooling efficiency, not directly to ICT risk.
ASHRAE recommends data centers maintain RH between 40-60% for optimal reliability. Values above 80% RH are considered outside the recommended operating envelope and significantly increase the risk of corrosion, especially in the presence of airborne contaminants like sulfur dioxide (SO#) or hydrogen sulfide (H#S).
Therefore, the verified risk at 85% RH is corrosion-related degradation.
References: ASHRAE TC 9.9 Thermal Guidelines (2016 Edition, Table 4.1), IEC 60721-3-3 Environmental Conditions for ICT Equipment.

問題 #81
When designing a data center network, your company wants to minimize the number of network switches to manage.
What type of physical cabling layout would be the best choice?

• A. ToR (Top of Rack) design
• B. It does not matter as the number of switches is not influenced by the physical cabling layout
• C. Star network design using coaxial cables
• D. EoR (End of Row) design
  

答案：D
解題說明：
An End of Row (EoR) design minimizes the number of network switches, as multiple racks can share a single switch at the end of a row, reducing switch counts and simplifying management. This design centralizes network switching to fewer points, which reduces the complexity and number of switches required compared to a Top of Rack (ToR) design, where each rack typically has its own switch.
Detailed Explanation:
In EoR designs, each row has a single network switch that handles the connections for all racks within that row. This reduces the number of individual switches needed and centralizes network management, which is ideal for minimizing equipment and simplifying infrastructure in the data center.
EPI Data Center Specialist References:
EPI promotes the EoR design as a way to reduce switch counts and streamline management in data centers. This configuration allows for easier scaling and maintenance while maintaining efficient network connectivity.

問題 #82
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