Exin CDCS Practice Test Questions ( Updated) – Real Exam Questions & Dumps PDF
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Exin CDCS Sample Questions – Free Practice Test & Real Exam Prep
Question #1
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. Two feeds coming from two different substations, one power company is acceptable
C. Two feeds entering the data center building from one substation
D. One feed from one substation split over two separated distribution boards in separate rooms
Answer: B
Explanation:
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.
Question #2
A data center requires an audit to find out whether it conforms with ANSI/TIA-942 Rated-3(concurrently maintainable).Will the network architecture be part of this audit?
A. No, as concurrently maintainable only applies to electrical and mechanical (power and cooling).
B. Yes, but only if the network administration does not comply with ANSI/TIA-606.
C. Yes, amongst other aspects, the network architecture should be Rated-3 compliant with therequirements of ANSI/TIA-942.
D. No, only the type of cabling used will be audited.
Answer: C
Explanation:
For a Rated-3 data center, network architecture is indeed a key component of the audit under
ANSI/TIA-942. This rating requires concurrent maintainability across all systems, including
telecommunications infrastructure. The network architecture must therefore meet specific
redundancy and reliability standards to ensure uninterrupted operations during maintenance or
failure of any single component.
Detailed
Explanation:
Rated-3 requirements extend beyond electrical and mechanical systems to include network
architecture. This ensures that telecommunications systems are also designed for concurrent
maintainability, thus contributing to overall uptime and resilience.
EPI Data Center Specialist References:
EPI endorses comprehensive assessments for Rated-3 facilities, emphasizing that network systems
must meet standards for redundancy and concurrent maintainability, which align with ANSI/TIA942s holistic approach to data center reliability.
Question #3
What is a significant difference between a halocarbon gas-based fire suppression system and an inertgas-based fire suppression system?
A. Inert gas has smaller-sized gas containers than halocarbon gas.
B. Inert gas harms the environment and halocarbon gas does not.
C. Halocarbon gas works on the basis of heat removal and inert gas works on the basis of oxygenreduction.
D. Halocarbon gas works on the basis of oxygen reduction and inert gas works on the basis of heatremoval.
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.
Question #4
Do you need to consider bullet (ballistics) protection when designing a data center?
A. Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers.
B. Bullet (ballistics) protection is only required when the data center is located in an area with a highcrime rate.
C. Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3.
D. Bullet (ballistics) protection is only required if the facility is a potential target or the building is inthe vicinity of a potential target.
Answer: D
Explanation:
Bullet (ballistics) protection is typically considered only for data centers that are potential targets or
located near such targets. While ANSI/TIA-942 does not specifically require bulletproofing for all data
centers, it is prudent to consider it based on location risk assessments, especially if the facility is in a
high-risk area or near critical infrastructure that could attract threats.
Detailed
Explanation:
Protective measures like bulletproofing depend on the threat landscape and the data centers
exposure to risks such as crime or terrorism. Assessments for physical security are typically
customized based on location-specific risks rather than being universally required by data center
standards.
EPI Data Center Specialist References:
EPI guidelines emphasize customizing physical security measures based on threat assessments,
suggesting that bulletproofing is appropriate in specific circumstances where the facilitys risk profile
justifies additional security measures.
Question #5
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 beenough to suppress the fire
B. It will rapidly increase the humidity level in the data center, which can cause a potential risk forthe operation of the equipment
C. It extracts oxygen from the air creating a potential risk for humans inside the computer room
D. It has droplets that are too small (100-120 microns) so it can only be used for small fires
Answer: B
Explanation:
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. Its essential to weigh the benefits of fire
suppression against potential risks to operational equipment when choosing suppression methods.
Question #6
Which formula is correct?
A. Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732
B. Phase-to-Neutral Voltage = Phase-to-Phase voltage .732
C. Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732
D. Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage
Answer: B
Explanation:
The correct formula for calculating Phase-to-Neutral Voltage in a three-phase power system is PhasetoNeutral Voltage = Phase-to-Phase Voltage / 1.732. This formula applies to balanced three-phase
systems, where 1.732 (or √3) represents the relationship between line-to-line and line-to-neutral
voltages.
Detailed
Explanation:
In three-phase systems, Phase-to-Phase Voltage is higher than Phase-to-Neutral Voltage by a factor
of √3. Dividing the phase-to-phase voltage by 1.732 gives the phase-to-neutral voltage, which is
critical for understanding power distribution in three-phase electrical systems commonly found in
data centers.
EPI Data Center Specialist References:
EPI electrical training highlights the importance of knowing these calculations for designing and
maintaining balanced power systems, which are essential for stable and efficient data center
operations.
Question #7
The electrical diagram of the data center shows the following UPS configuration and has a load of 80kW.What is the set-up in this data center?
A. 2+N+1
B. 2(N+1)
C. N+N(+1)
D. (N+1)-(N+1)
Answer: B
Explanation:
A 2(N+1) configuration implies two independent UPS systems, each with N+1 redundancy. This
configuration provides high availability by ensuring that each UPS system can independently support
the load with an additional unit for redundancy. Given the 80 kW load, this setup implies that two
separate N+1 systems are running, providing reliability and fault tolerance for the data centers
power needs.
Detailed
Explanation:
The N+1 notation denotes that each system has one additional unit beyond what is needed to carry
the load, providing redundancy. With 2(N+1), there are two such setups, ensuring that if one fails,
the other can still support the load without interruption, fulfilling high availability requirements.
EPI Data Center Specialist References:
EPI teaches that multiple redundant systems, such as 2(N+1), enhance data center reliability by
ensuring that power is maintained even if a failure occurs in one system. This meets the stringent
demands for uptime in critical environments.
Question #8
Smoke sensors need to be tested to ensure that they pick up a potential fire in the data center.What should you recommend?
A. Test the sensors by injecting smoke or simulated smoke directly into the sensor
B. Press the self-test button on each sensor in the data center
C. Inject smoke at the floor level
D. Test the sensors according to the vendor specification
Answer: D
Explanation:
Testing smoke sensors should be conducted according to the vendor specifications to ensure
compliance with safety standards and accurate results. Vendors provide specific testing procedures
to account for the sensor type, environment, and operational characteristics, ensuring that tests do
not damage the equipment or provide false results.
Question #9
The building in which the computer room is housed is required to have a sprinkler system. Thebuilding is therefore equipped with a wet pipe system.What action, if any, should you recommend for the computer room?
A. Maintain the current wet pipe system.
B. Replace the wet pipe system with a deluge system.
C. Replace the wet pipe system with a dry pipe system.
D. Replace the wet pipe system with a pre-action system.
Answer: D
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.
Question #10
Is it allowed to make design changes during the implementation phase?
A. No, after a design freeze no further changes are allowed.
B. Any change is fine as long as it is within the scope of the project.
C. Yes, but only when time to implement is not exceeded.
D. Only when there is a strong business and/or technical justification.
Answer: D
Explanation:
Design changes during the implementation phase are generally allowed only when there is a strong
business and/or technical justification. Changes at this stage can lead to delays, increased costs, or
compromise design integrity. Thus, a rigorous assessment is required to ensure any modifications are
essential and provide clear benefits or address critical issues.
Detailed
Explanation:
Changes post-design freeze should be minimized to avoid scope creep and additional costs. However,
if a technical issue arises that would affect operational goals, or a business need warrants
modification, justified changes are permissible, following an impact assessment and approval
process.
EPI Data Center Specialist References:
EPI project management guidelines recommend a controlled change management process during
implementation, allowing changes only when they align with critical objectives or address
unforeseen issues that affect the project's success.
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