CDCS Dumps Questions Increase Your Chance of Success

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November 10, 2024

Passing the CDCS certification exam can be challenging, which is why practicing with CDCS questions can greatly increase your chances of success. EXIN CDCS dumps questions help you become familiar with the exam format. The CDCS questions are designed to mimic the actual exam, which means that you'll get a feel for the types of questions you'll encounter, the difficulty level, and the time limit. All the CDCS exam dumps questions are the latest version for you to study. Test free CDCS exam questions below.

Page 1 of 4

1. What is the risk of high levels of hydrogen sulfide (H ₂ S) in the computer room?

There is no risk

H ₂ S impacts the static properties of the floor

H ₂ S can cause corrosion which impacts reliability of equipment

H ₂ S impacts gas-based fire suppression system operation

2. The humidity in the computer room has changed from about 50% down to 35% Relative Humidity (RH).

What influence does this have on Electrostatic Discharge (ESD)?

No influence as long as the temperature is at approximately 20°C/77°F

Relative humidity has no influence on ESD

ESD levels will go up

ESD levels will go down

3. It is assumed that EMF shielding material must be installed as the EMF levels coming from the transformer room into the computer room are measured at 100mG. The transformer room is approximately 10 meters away from the computer room and is separated by a corridor. You can assume that no physical issues are present for installing shielding material at any area/location. Where should you recommend the shielding material to be installed?

As close as possible to the computer room

As close as possible to the transformer room

It does not matter, either close to the transformer room or the computer room is okay as there is no impact to cost or shielding material performance

Shielding is not required to be installed as 100mG is within the acceptable levels for computer rooms

4. What is the main disadvantage of using a ToR (Top of Rack) design?

A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch.

You need a separate rack to install all your ToR (Top of Rack) switches.

There will be more switches to manage.

A ToR (Top of Rack) switch has only optical interfaces.

5. Which class of UPS is ideal for data centers?

VFD (Voltage and Frequency Dependent)

VI (Voltage Independent)

VFI (Voltage and Frequency Independent)

First class

6. 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?

Install single-phase power cabling

Install three-phase power cabling based on three individual core wires

Install bus bar trunking

Install three-phase power cabling based on a combined cable (e.g., XLPE)

7. 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?

Rated-2 since that is the lowest rating received

Rated-4 since that is the highest rating received

Rated-4 since electrical is more important than mechanical and architectural

Depends on the Rating scored in telecommunications

8. 1.Management has requested a 15-minute battery bank assuming full load on the UPS.

The UPS vendor has provided the following specifications of the UPS:

• Rated power: 30 kVA

• Rectifier input voltage: 400 V/3 phase

• Rectifier input power factor: 0.8

• Battery rated voltage: 384 V

• Number of cells: 192

• End of discharge voltage: 308 V

• Inverter output voltage: 400 V/3 phase

• Inverter output power factor: 0.8

What information is missing to perform the battery calculation?

UPS efficiency

Inverter efficiency

Load imbalance on the phases

Available battery charging current

9. What is needed to determine the Relative Humidity (RH)?

Wet bulb temperature, local atmospheric pressure, and calculator

Dry bulb temperature, airflow, and conversion table

Cold surface with dew collection counter

Dry bulb temperature, wet bulb temperature, and psychrometric chart

10. You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600 Ah. Calculate how much charging current the rectifier should be able to supply as charging current.

12 Amperes

30 Amperes

60 Amperes

80 Amperes

Page 2 of 4

11. An MCB needs to be installed in the PDU of an air-conditioner unit.

Which breaking curve should you select?

D-Curve

C-Curve

B-Curve

A-Curve

12. What is the advantage of OM5 multimode fiber cabling?

Supports SWDM, requiring fewer fibers

No advantage―same as OM4

Designed for cheaper LED transmitters

100 Gbit/s link for 500 m reach

13. When shielding material reaches its saturation point, what will be the impact?

The shielding material will reach its optimal shielding performance state.

The shielding material will no longer be able to attenuate (reduce) additional EM

The shielding material will increase its permeability factor.

The shielding material will reach its maximum electrically charged state.

14. You want to make cooling more effective by setting cold aisle temperature to 4 °C (39 °F).

Is this acceptable?

Yes, but only if cooling systems can maintain this continuously

Yes, as long as dewpoint doesn’t go below -9 °C (16 °F)

No, 4 °C (39 °F) is below the allowable ASHRAE range

No, intake air must be exactly 20 °C (68 °F)

15. Given: A = attenuation in dB, R = real measured value, M = maximum acceptable value.

Which formula should be used to calculate the required attenuation factor of EMF shielding material?

A = 10 log (R/M)

A = 20 log (M/R)

A = 10 log (M/R)

A = 20 log (R/M)

16. 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?

No, as concurrently maintainable only applies to electrical and mechanical (power and cooling).

Yes, but only if the network administration does not comply with ANSI/TIA-606.

Yes, amongst other aspects, the network architecture should be Rated-3 compliant with the requirements of ANSI/TIA-942.

No, only the type of cabling used will be audited.

17. An MCB needs to be installed in the PDU of an ICT rack.

Which breaking curve should you select?

D-Curve

C-Curve

B-Curve

A-Curve

18. A 5kW (power consumption) server keeps crashing with the message 'temperature too high'.

The intake temperature is measured at 25 °C/77 °F and a relative humidity (RH) level of 50%.

The exhaust temperature is 29 °C/84 °F and 45% RH.

The raised floor is providing an adequate amount of CFM/CMH at a reasonable velocity.

The pressure under the raised floor is approximately 25 Pa/0.1 inch H ₂ O.

Analyze the situation and indicate what the most likely cause is for this server to crash.

Dust inside the server causing issues with convection-based heat transfer

The exhaust temperature is exceeding the ASHRAE recommended values

The raised floor pressure is too low and/or the raised floor tile % opening is not adequate

No cause could be determined as the CFM/CMH of the air conditioning equipment is not stated

19. The pipes of a VESDA smoke detection system are installed at the air intake of the air conditioner inside the computer room.

Is this a good practice from an early smoke detection point of view?

It depends on the type of gas-based fire suppression which will be installed.

Yes, as this reduces the amount of piping to be installed in the data center, as all air will go through the air conditioner.

No, the piping should be installed at the air exhaust of the air conditioner, as there can also be a fire inside the air conditioner itself.

No, it will give a longer reaction time for the smoke detection system and there might also be bypass airflow.

20. ICT rack consumes 3 kW with ΔT ~11 °C (20 °F). Calculate required airflow (CFM).

~1,500 CFM

~1,000 CFM

~500 CFM

~160 CFM

Page 3 of 4

21. What is the main reason to install Earth Leakage protection?

Protection of ICT equipment against high-frequency noise currents

Protection of human lives

Improvement of the data center grounding/earthing system

Protection against lightning strikes

22. Where should perforated tiles be installed?

At the back of racks

Every 5th rack

One tile per rack in front

As close to AC as possible

23. What is the advantage or disadvantage of using MPO (Multi-fiber Push On)/pre-terminated fiber?

There is no advantage, as it cannot be used with OM4 optical fiber cables.

There is no advantage, as it creates additional heat load in the data center.

It speeds up installation and provides an easy upgrade to transmission speeds up to 40 Gbit/s -100 Gbit/s.

It is a very flexible system as it can be used for both copper cables and optical fiber cables.

24. The UPS of a data center, with an ANSI/TIA-942 Rating-4, is installed with the rectifier connected to power feed A and the bypass/reserve line input connected to power feed

B. To which feed will the output of the UPS be synchronized?

The UPS will not synchronize to any of the feeds but use an internal clock to set the output voltage and frequency

Depends on the setting of the UPS, as the UPS can normally be set to either feed

Feed A

Feed B

25. Do you need to consider bullet (ballistic) protection when designing a data center?

No; bullet protection is not a requirement of ANSI/TIA-942

No, there is no reason for implementing bullet protection as you cannot predict the type of weapons that might be used

Yes, but only when the data center is built in an area with a high criminality rate or with a risk of terrorist attacks

Yes, bullet protection is a requirement of ANSI/TIA-942 for Rated-3/4 data centers

26. What precaution shall be taken for cabling leading into an equipment rack when a data center is in a seismic-prone area?

Cables should be loosely organized to allow for movement and be latched at the connectors.

Cables shall be tightly organized to the rack and trays to avoid movement.

Cables can be organized in any way as it is not important.

Cables should be replaced by busbar trunking.

27. What indicates the breaking capacity of a fuse or breaker?

Mechanical strength of the casing of a fuse or breaker.

The maximum voltage, in case of an electrical surge, that the fuse or breaker can handle without being destroyed or causing an electric damaging arc.

The current at which the device will trip.

The current that a fuse or breaker is able to interrupt without being destroyed or causing an electric damaging arc.

28. In which stage of the data center life cycle does commissioning take place?

Retire

Operate/optimize

Implement

Design

29. What is a potential disadvantage of using a hypoxic-based fire suppression system as a fire extinguishing system?

It can only be used in computer rooms which have sufficient air changes per hour.

The gas containers need to be close to the hazard area.

It can only be used in non-continuous occupied areas.

It can only be used in computer rooms where you have sufficient positive pressure.

30. The logical overview of the data center looks as pictured.

To what TIA-942 Rating is this design made based on electrical only?

Rating - 4

Rating - 3

Rating - 2

Rating - 1

Page 4 of 4

31. The building requires sprinklers and is equipped with a wet-pipe system.

What action should you recommend for the computer room?

Maintain the current wet-pipe system

Replace the wet-pipe system with a deluge system

Replace the wet-pipe system with a pre-action system

Replace the wet-pipe system with a dry-pipe system

32. What is a disadvantage of hypoxic-based fire suppression?

Only usable in non-occupied areas

Only usable in rooms with sufficient air changes

Gas containers must be close to hazard

Only usable with positive pressure rooms

33. A computer room with a raised floor has been designed with racks in a hot/cold aisle setup.

What should you recommend for the placement of down-flow air conditioners?

Air conditioners perpendicular to (at the end of the row of) the Cold-Aisle

Air conditioners perpendicular to (at the end of the row of) the Hot-Aisle

Air conditioners should always be placed at both sides of each row of racks

Air conditioner placement has no influence on cooling effectiveness and efficiency. Hence, they can be placed at any convenient location.

34. Which formula is correct?

Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732

Phase-to-Neutral Voltage = Phase-to-Phase voltage /1.732

Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732

Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage

35. 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?

ToR (Top of Rack) design

EoR (End of Row) design

Star network design using coaxial cables

It does not matter as the number of switches is not influenced by the physical cabling layout

36. Can you install a raised floor tight to the perimeter of the room?

Yes, but only if the data center is located in Zone 0 with no or little seismic activity

Yes, a raised floor needs to be installed tight to the perimeter to prevent air leakage

No, to avoid damage to the raised floor due to building and hygrothermal movement

No, but this applies only to raised floors with a height of over 90 cm (3 ft)

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