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CDCS EXIN EPI Certified Data Centre Specialist Questions and Answers

Questions 4

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

Options:

A.

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

B.

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

C.

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

D.

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

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Questions 5

The temperature in the computer room is being increased from 18°C/64°F to 27°C/81°F.

What is the impact, if any, on the amount of gas required to suppress a fire assuming the gas is a Halocarbon?

Options:

A.

The amount of gas required will be higher

B.

The amount of gas required will not change

C.

The amount of gas required will be lower

D.

The change to the amount of gas cannot be determined without knowing the change in humidity as well

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Questions 6

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

Options:

A.

The shielding material will reach its optimal shielding performance state.

B.

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

C.

The shielding material will increase its permeability factor.

D.

The shielding material will reach its maximum electrically charged state.

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Questions 7

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?

Options:

A.

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

B.

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

C.

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

D.

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

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Questions 8

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?

Options:

A.

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

B.

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

C.

Feed A

D.

Feed B

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Questions 9

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?

Options:

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 the requirements of ANSI/TIA-942.

D.

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

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Questions 10

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?

Options:

A.

UPS efficiency

B.

Inverter efficiency

C.

Load imbalance on the phases

D.

Available battery charging current

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Questions 11

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?

Options:

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.

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Questions 12

Three data centers are benchmarked on facilities energy efficiency.

Data center A has achieved a PUE of 2.45.

Data center B has achieved a PUE of 1.20.

Data center C has achieved a PUE of 1.90.

Which of the data centers is operating at the highest facility efficiency?

Options:

A.

PUE does not indicate efficiency

B.

Data center A

C.

Data center B

D.

Data center C

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Questions 13

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

Options:

A.

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

B.

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

C.

There will be more switches to manage.

D.

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

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Questions 14

What should you consider when using raised floor tiles with air deflectors or louvers?

Options:

A.

Tiles with air deflectors or louvers can be very heavy.

B.

Tiles with air deflectors or louvers will reduce the cooling capacity of the tile.

C.

Tiles with air deflectors or louvers do not allow for a flexible cooling solution.

D.

Tiles with air deflectors or louvers can only be used to cool storage equipment.

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Questions 15

The computer room has high levels of H2S gas contamination. What is the best option to resolve this issue?

Options:

A.

Vacuum the whole room using a HEPA/S-Class-based filter.

B.

Install air-scrubbers.

C.

Clean the room and racks with a damp/wet cloth.

D.

Provide more air changes per hour by adding more fresh air to the computer room.

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Questions 16

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?

Options:

A.

ToR (Top of Rack) design

B.

EoR (End of Row) design

C.

Star network design using coaxial cables

D.

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

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Questions 17

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

Options:

A.

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

B.

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

C.

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

D.

Cables should be replaced by busbar trunking.

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Questions 18

You are allowed to use a calculator for this question.

A computer room has a net volume of approximately 2,500 m³ / 88,287 ft³.

The temperature is 20 °C / 68 °F.

The required design concentration is 7%.

The S-Factor is 0.1359 (metric) / 1.885 (imperial).

Calculate the amount of gas required for this computer room based on FM200. What is the correct weight?

Options:

A.

Approximately 410 kg / 900 lbs

B.

Approximately 820 kg / 1,800 lbs

C.

Approximately 1,390 kg / 3,000 lbs

D.

Approximately 1,640 kg / 3,600 lbs

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Exam Code: CDCS
Exam Name: EXIN EPI Certified Data Centre Specialist
Last Update: Dec 2, 2024
Questions: 60
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