[2026] Use Valid New CDCS Test Notes & CDCS Valid Exam Guide
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NEW QUESTION # 41
The building in which the computer room is housed is required to have a sprinkler system. The building is therefore equipped with a wet pipe system.
What action, if any, should you recommend for the computer room?
- A. Replace the wet pipe system with a dry pipe system.
- B. Replace the wet pipe system with a pre-action system.
- C. Maintain the current wet pipe system.
- D. Replace the wet pipe system with a deluge system.
Answer: B
Explanation:
In computer rooms, replacing a wet pipe system with a pre-action system is advisable. Pre-action systems provide additional protection by requiring two triggers (e.g., heat and smoke) before water is released, minimizing the risk of accidental discharge and water damage, which is crucial for safeguarding sensitive IT equipment.
Detailed Explanation:
Wet pipe systems contain water in the pipes at all times, which poses a higher risk of accidental discharge. Pre-action systems, however, only fill the pipes with water upon detection of a fire, reducing the risk of water-related damage due to leaks or malfunctions. This approach is considered best practice for environments housing sensitive electronic equipment.
EPI Data Center Specialist References:
EPI advises using pre-action fire suppression in data centers to reduce risks associated with accidental water release, providing a safer and more controlled fire response that better protects critical infrastructure.
NEW QUESTION # 42
The 'maximum exposed area' of the fire-rated glass is defined by the supplier as 3 sqm/32 sqft. The window area is 4 sqm/43 sqft.
What would be the best option?
- A. Split the window in two equal parts fitted together with transparent silicon glue.
- B. Do not use fire-rated glass due to the size limit and replace it with normal glass.
- C. Split the window into parts smaller than specified as the maximum exposed area and ensure fire-rated frames are used.
- D. Split the window in two equal parts using an aluminum frame.
Answer: C
Explanation:
When the window area exceeds the maximum exposed area specified for fire-rated glass, it is necessary to split the window into sections that comply with the fire rating requirements. This means creating smaller sections that are each within the 3 sqm/32 sqft limit and using fire-rated frames to ensure that the entire assembly meets fire safety standards. This approach maintains the fire-rated integrity of the glass, while allowing for larger window areas.
Detailed Explanation:
Fire-rated glass is designed to contain fire and prevent it from spreading. If the window exceeds the maximum exposed area defined by the supplier, the integrity of the fire-rated glass could be compromised. By dividing the window into compliant sections with fire-rated frames, you ensure that each pane performs as intended in the event of a fire. Fire-rated frames help maintain the fire resistance across the entire assembly, making this option the best for safety and compliance.
EPI Data Center Specialist References:
EPI recommends adhering strictly to fire safety standards, especially when using materials like fire-rated glass. The guidelines emphasize that modifications should always respect the manufacturer's specifications to ensure the system remains effective in containing and preventing the spread of fire.
NEW QUESTION # 43
What is the advantage of OM5 multimode fiber cabling?
- A. 100 Gbit/s link for 500 m reach
- B. Supports SWDM, requiring fewer fibers
- C. Designed for cheaper LED transmitters
- D. No advantage-same as OM4
Answer: B
Explanation:
OM5 is optimized for Short Wavelength Division Multiplexing (SWDM) between 850-953 nm. This allows transmission of multiple wavelengths over a single fiber pair, reducing the number of fibers required for high- speed links.
* OM4 already supports 100 GbE to 150 m, but OM5 with SWDM extends reach and reduces cabling bulk.
* Option B is false because OM5 offers distinct SWDM benefits.
* Option C is incorrect-OM5 is laser-optimized, not LED-based.
* Option D is misleading; OM5 doesn't extend 100 GbE to 500 m (that requires single-mode OS2 fiber).
Thus, the key advantage is SWDM support.
References: ANSI/TIA-568.3-D, ISO/IEC 11801-1, IEEE 802.3cm (400G over MMF).
NEW QUESTION # 44
What should you consider when using raised floor tiles with air deflectors or louvers?
- A. Tiles with air deflectors or louvers will reduce the cooling capacity of the tile.
- B. Tiles with air deflectors or louvers can be very heavy.
- C. Tiles with air deflectors or louvers can only be used to cool storage equipment.
- D. Tiles with air deflectors or louvers do not allow for a flexible cooling solution.
Answer: B
Explanation:
Raised floor tiles with air deflectors or louvers are typically heavier than standard tiles due to the additional materials and mechanisms used to direct airflow. The added weight can pose challenges for installation and adjustment, and consideration must be given to the floor's load capacity and ease of maintenance.
Detailed Explanation:
Tiles with deflectors or louvers help direct airflow, enhancing cooling efficiency by focusing cool air where needed. However, these tiles are often heavier, which can affect handling and require reinforced raised floor systems. It's essential to factor in the weight for any floor tile replacements or installations to ensure they are compatible with the raised floor's structural capacity.
EPI Data Center Specialist References:
EPI data center design training mentions the potential impact of heavy tiles on floor handling and load capacity. Data center operators need to plan for safe handling and load-bearing capacity when using such specialized tiles.
NEW QUESTION # 45
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 has a higher fire rating.
- B. Pre-terminated cabling is already factory tested and saves installation time.
- C. 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.
- D. There is no advantage as most new copper cabling network designs are based on category 3 or 5E for horizontal cabling.
Answer: B
Explanation:
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.
NEW QUESTION # 46
What is a significant difference between a halocarbon gas-based fire suppression system and an inert gas-based fire suppression system?
- A. Inert gas has smaller-sized gas containers than halocarbon gas.
- B. Halocarbon gas works on the basis of oxygen reduction and inert gas works on the basis of heat removal.
- C. Halocarbon gas works on the basis of heat removal and inert gas works on the basis of oxygen reduction.
- D. Inert gas harms the environment and halocarbon gas does not.
Answer: C
Explanation:
A halocarbon gas-based fire suppression system primarily extinguishes fires through heat absorption. In contrast, an inert gas-based system works by reducing oxygen levels to a point where combustion cannot be sustained. Halocarbon agents, like FM-200, absorb heat from the fire, cooling it down, whereas inert gases, like nitrogen or argon, lower oxygen concentration.
Detailed Explanation:
Halocarbons are effective in quickly cooling flames and are suitable for electronic environments due to their fast action. Inert gases displace oxygen to suppress fires, making them ideal in occupied spaces where human safety can be managed during a fire event due to slower discharge times.
EPI Data Center Specialist References:
EPI training distinguishes between these suppression mechanisms, noting the importance of selecting the correct system based on specific needs like quick response versus oxygen displacement for environments with sensitive equipment.
NEW QUESTION # 47
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 that is the highest rating received
- B. Rated-4 since electrical is more important than mechanical and architectural
- C. Rated-2 since that is the lowest rating received
- D. Depends on the Rating scored in telecommunications
Answer: C
Explanation:
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.
NEW QUESTION # 48
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. There will be a cooling risk due to a high wet bulb temperature
- B. The electrostatic discharge (ESD) levels will go up
- C. No risks at all
- D. The risk of excessive wear and corrosion will increase
Answer: D
Explanation:
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.
NEW QUESTION # 49
What is the calculation for the desired attenuation factor for shielding material?
- A. A = 20 log (R / M)
Where A is Attenuation R is the real value measured M is the maximum acceptable value - B. A = 20 log (M / R)
Where A is Attenuation M is the maximum acceptable value R is the real value measured - C. A = M / R
Where A is Attenuation M is the maximum acceptable value R is the real value measured - D. You do not have to calculate the attenuation factor for shielding material as it always has the same attenuation
Answer: A
Explanation:
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.
NEW QUESTION # 50
What is the advantage or disadvantage of using MPO (Multi-fiber Push On)/pre-terminated fiber?
- A. There is no advantage, as it cannot be used with OM4 optical fiber cables.
- B. It speeds up installation and provides an easy upgrade to transmission speeds up to 40 Gbit/s -100 Gbit
/s. - C. There is no advantage, as it creates additional heat load in the data center.
- D. It is a very flexible system as it can be used for both copper cables and optical fiber cables.
Answer: B
Explanation:
MPO (Multi-fiber Push On) pre-terminated fiber offers the advantage of quick installation and supports high- speed upgrades up to 40 Gbit/s and 100 Gbit/s. This technology simplifies connections by allowing multiple fibers to be connected in a single plug-and-play module, reducing installation time and making future expansions or upgrades to higher speeds easier.
Detailed Explanation:
MPO connectors consolidate multiple fiber connections into a single interface, which simplifies cable management and reduces installation complexity. This setup is particularly beneficial in data centers where high-speed networks are essential, and where rapid deployment is necessary. MPO pre-terminated fiber also supports the use of OM4 fiber, making it compatible with existing high-performance cabling infrastructure.
EPI Data Center Specialist References:
EPI training highlights that pre-terminated fiber solutions, like MPO, can greatly enhance efficiency in data centers. By reducing installation time and providing scalability for higher transmission speeds, they align with best practices for maintaining flexible and future-ready network infrastructure.
NEW QUESTION # 51
A new network storage device in a non-standard size rack of approximately 600 kg/1,300 lbs is going to be installed in the data center.
Are new floor loading calculations required?
- A. No, as long as the equipment is less than 700 kg/1,500 lbs it will be within the limits.
- B. No, specifications of equipment brought into the data center will already be known during the design of the data center, and therefore the floor will be able to handle it.
- C. Yes, additional floor loading calculations need to be done by the floor manager, which should be verified by the safety engineer.
- D. Yes, a structural engineer, approved/endorsed by the building owner, should carry out new floor loading calculations.
Answer: D
Explanation:
For heavy equipment, such as a network storage device weighing approximately 600 kg/1,300 lbs, new floor loading calculations are indeed required, particularly since the rack is non-standard. A structural engineer, approved by the building owner, should conduct these calculations to ensure the floor can safely support the new load without risking structural integrity.
Detailed Explanation:
Data centers are designed with specific floor load ratings, which are determined during the design phase based on anticipated equipment. When adding or replacing equipment that is significantly heavy or non-standard, reassessing the floor's capacity is essential to avoid overloading. A structural engineer has the expertise to verify if the existing floor can accommodate the weight and, if not, can recommend reinforcement measures.
This step ensures compliance with safety standards and helps prevent damage to the infrastructure, which could lead to costly repairs or even catastrophic failure in extreme cases.
EPI Data Center Specialist References:
EPI Data Center Specialist training advises that any changes in the data center load, particularly involving non-standard and heavy equipment, warrant a structural assessment. Ensuring compliance with floor load capacity is a critical safety and operational concern, as underscoring data center infrastructure reliability and safety is a priority in EPI's best practices.
NEW QUESTION # 52
The logical overview of the data center looks as pictured below. To what TIA-942 Rating is this design made based on electrical only?
- A. Rating-1
- B. Rating-3
- C. Rating-2
- D. Rating-4
Answer: D
Explanation:
The diagram shows two independent utility feeds, each backed up by generators, connected to two separate distribution paths. Each path supplies its own UPS system in an N+1 configuration, which then feeds PDUs and ICT loads. Mechanical equipment also has dual redundant feeds. This means the electrical design ensures concurrent maintainability (systems can be maintained without downtime) and fault tolerance (a single fault anywhere in the power path will not impact ICT load).
According to ANSI/TIA-942-B, the electrical infrastructure for a Rated-4 data center must have two active distribution paths, each independently capable of supporting the ICT load. It also requires full redundancy (N+1 or greater) on critical components such as UPS and generators. This diagram clearly illustrates that architecture: dual feeds, dual UPS, and fault tolerance.
In contrast, Rating-3 offers concurrent maintainability but does not guarantee full fault tolerance. Rating-2 and Rating-1 are less stringent and would not provide the dual power distribution seen here.
References: ANSI/TIA-942-B §6.2 (Electrical Infrastructure Requirements), Figure 21 (example of dual active distribution).
NEW QUESTION # 53
EMF shielding material needs to be installed as EMF levels from the transformer room into the computer room are measured at 100 mG. The transformer room is ~10 meters away, separated by a corridor. Where should shielding be installed?
- A. It does not matter; either close to the transformer room or computer room is okay
- B. Shielding is not required as 100 mG is within acceptable levels
- C. As close as possible to the computer room
- D. As close as possible to the transformer room
Answer: D
Explanation:
The most effective EMF mitigation is to install shielding as close as possible to the source of radiation. By blocking or redirecting magnetic flux at the origin (the transformer room walls), the overall field propagation into adjacent areas is minimized. If shielding were placed at the computer room, the field would already have spread over the intervening space, requiring more material and higher cost.
Standards such as IEEE Std 299 (EMC Shielding Effectiveness) and IEC 61000 emphasize source-based mitigation. Additionally, ANSI/TIA-942 requires EMF shielding where magnetic flux exceeds recommended ICT thresholds (generally <5 mG for sensitive tape/disk storage).
Although 100 mG is often tolerated by modern equipment, legacy magnetic storage can be affected, so shielding is still prudent. Hence, the correct location is at the transformer room wall.
References: IEEE Std 299 (EMI Shielding), ANSI/TIA-942-B §6.6.4 (EMF Requirements), IEC 61000 EMC standards.
NEW QUESTION # 54
What is the preferred way to measure dust levels in the computer room?
- A. With test coupons
- B. By opening up equipment for inspection
- C. With an air particle hand-held analyzer
- D. By taking dust samples under the raised floor
Answer: A
Explanation:
ASHRAE TC 9.9 recommends using dust deposition coupons (also called reactivity coupons) to measure particulate contamination over time. These are small, standardized metallic plates exposed to the air that collect dust and contaminants. After a set period, they are analyzed for chemical corrosion rates and particulate buildup.
* Option A (handheld analyzers) gives spot counts of airborne particles but does not capture long-term corrosive deposition risk.
* Option C only samples underfloor plenum dust, not actual IT environment contamination.
* Option D (opening equipment) is invasive and risks voiding warranties.
Coupons provide standardized, passive, and reliable monitoring of contamination over months, making them the preferred method.
References: ASHRAE TC 9.9 "Particulate and Gaseous Contamination Guidelines," IEC 60721-3-3.
NEW QUESTION # 55
In order to save energy, you are going to install an automated system to switch off lights. What should be taken into consideration when installing such a system?
- A. The system should not be based on motion detection as the lights might suddenly switch off while staff is still at work.
- B. At all times, the levels should allow for security cameras to function properly.
- C. Security guards should perform regular inspections verifying the system works.
- D. It is not advisable to use such a system since it will reduce the lifetime of LED lighting.
Answer: B
Explanation:
When installing an automated lighting system, especially in a security-sensitive area like a data center, it's essential to ensure that lighting levels support security camera functionality at all times. Sufficient lighting is necessary for cameras to capture clear footage, ensuring continuous monitoring and security regardless of occupancy.
Detailed Explanation:
Automated lighting based on occupancy or time settings can reduce energy costs, but it must be configured to maintain adequate illumination for surveillance. Security cameras require minimum lighting levels to operate effectively, so lighting should be configured to avoid compromising security.
EPI Data Center Specialist References:
EPI emphasizes security and safety in data centers, advising that lighting systems should maintain levels conducive to effective surveillance, ensuring operational security even when lights are automatically controlled.
NEW QUESTION # 56
A new facility requires electrical distribution of 100A to be installed in the computer room, 1 m (3 ft) above sensitive IT equipment. What type of system minimizes EMF impact?
- A. Install three-phase power cabling based on three individual core wires
- B. Install three-phase power cabling based on a combined cable (e.g., XLPE)
- C. Install single-phase power cabling
- D. Install bus bar trunking
Answer: B
Explanation:
Electromagnetic fields are generated by current-carrying conductors. To minimize stray EMF, phase conductors should be physically close and balanced. A three-phase combined cable (all phase conductors and neutral in one sheath) ensures magnetic fields cancel each other due to phase opposition.
If phases are run separately (answer B), the separation increases loop area and magnetic field leakage. Single- phase cabling (A) is even worse because current does not balance across three phases. Bus bar trunking (C) provides physical support but often separates conductors, which may worsen EMF if not specifically shielded.
Therefore, the correct solution is three-phase combined cable (often XLPE-insulated). This design reduces EMF impact to within ANSI/TIA-942 and IEEE recommendations.
References: IEEE Std 141 (Red Book - Power Distribution), ANSI/TIA-942-B §6.6.4, IEC 60364 (Wiring Systems and EMF).
NEW QUESTION # 57
What is forced entry resistance based on?
- A. Building materials used and the location of the data center
- B. The number of security guards on duty
- C. Rate and installed number of CCTV cameras
- D. Time, tools, and people
Answer: D
Explanation:
Forced-entry ratings use defined attack tools and durations (time-to-breach) executed by attacker profiles.
References: EN 1627-1630 (Resistance Classes-tools and time), UL 972/UL 752 (attack tools/time).
NEW QUESTION # 58
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. 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
- B. Continuous generators should be installed; no N+1 configuration is needed as the generators will run all the time
- C. Standby generators should be installed in at least an N+1 configuration
- D. Continuous generators should be installed, at least in an N+1 configuration
Answer: D
Explanation:
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.
NEW QUESTION # 59
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. Only when the racks might block access to the fire panel.
- C. No, cooling and design of racks have no influence on the fire suppression system design.
- D. Yes, the design of the racks has an influence on the fire suppression system design.
Answer: D
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 # 60
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