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DU0-001 Data Center University Associate Certification Questions and Answers

Questions 4

Hot aisle containment systems serve which primary function?

Options:

A.

They enclose the top and bottom of racks to balance hot and cold air.

B.

They enclose the rear of racks to ensure mixing of hot and cold air.

C.

They enclose the front of racks to ensure reliable supply air delivery.

D.

They enclose the rear of racks to prevent mixing of hot and cold air.

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Questions 5

How does poor network cable management within an IT rack lead to IT equipment damage?

Options:

A.

Obstructs airflow

B.

Adds weight to servers

C.

Requires the need for more cabling

D.

Causes cable to exceed bend radius

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Questions 6

Planned downtime is necessary for many data centers. management tools that ignore planned downtime can have which consequence?

Options:

A.

Spurious alerts leading to incorrect actions by personnel

B.

Insufficient runtime specifications for blade server deployments

C.

Downtime that can result from individual components failing

D.

Reduction in the training and knowledge that is necessary to maintain the NCPI system

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Questions 7

Which two cooling architectures are flexible enough to adapt to ever-changing data center requirements? (Choose two.)

Options:

A.

Row

B.

Rack

C.

Room

D.

Building

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Questions 8

What are two reasons for choosing enclosures with square holes and cage nuts? (Choose two.)

Options:

A.

Eases repair of mounting rails

B.

Eases installation

C.

Eases bolt alignment

D.

Eases enclosure stabilization

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Questions 9

Click the Exhibit button.

What does the shaded area in the exhibit represent?

Options:

A.

Deferred investment

B.

Waste due to oversizing

C.

Total redundant capacity

D.

Additional power needed

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Questions 10

What is the advantage of a three-phase power source versus a single-phase power source?

Options:

A.

Three-phase power delivers balanced voltage across all three-phases.

B.

Three-phase power delivers up to three times the amount of power of a single-phase power source.

C.

Three-phase power cancels neutral harmonics on the 3rd, 5th, and 7th orders where Single-phase power does not.

D.

Three-phase power does not require a neutral; therefore, you can attain increased levels of efficiency over single-phase power.

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Questions 11

What is the actual horizontal mounting hole spacing (center-to-center) based on the EIA-310 standard for 482.6 mm (19 inch) racks?

Options:

A.

450 mm (17.72 inches)

B.

465 mm (18.31 inches)

C.

482.6 mm (19 inches)

D.

495.3 mm (19.5 inches)

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Questions 12

Which three factors should be considered when evaluating physical security systems? (Choose

three.)

Options:

A.

VESD protocols

B.

User friendliness

C.

Cost of equipment

D.

Color of security hardware components

E.

Likelihood of locking out legitimate users

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Questions 13

What are two advantages that the isolated redundant configuration has over a capacity configuration? (Choose two.)

Options:

A.

The isolated redundant configuration has a lower operating cost than a capacity design.

B.

The isolated redundant configuration provides redundancy but the capacity configuration does not.

C.

The isolated redundant configuration can scale to larger capacities than the capacity configuration.

D.

The isolated redundant configuration allows multiple vendor UPSs. The capacity configuration must use the same UPS manufacturers.

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Questions 14

What is the minimum number of UPS modules used in a distributed redundant configuration?

Options:

A.

One

B.

Two

C.

Four

D.

Three

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Questions 15

What are two common UPS topologies? (Choose two.)

Options:

A.

Standby

B.

Delta interactive

C.

Standard interactive

D.

Double conversion on-line

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Questions 16

What is a result of an undervoltage condition?

Options:

A.

Transients

B.

Motors overheating

C.

Power distribution oversizing

D.

UPS frequency compensation

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Questions 17

Which rack accessory prevents exhaust air from being recirculated and entering equipment intakes?

Options:

A.

Cage nuts

B.

Vented shelves

C.

Blanking panels

D.

Cable managers

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Questions 18

Which statement describes a difference between fiber and copper cabling?

Options:

A.

Copper is generally less expensive than fiber for long runs.

B.

Copper is generally less expensive than fiber for short runs.

C.

Signals can be transmitted longer distances over copper than multi-mode fiber.

D.

Signals can be transmitted longer distances over copper than single-mode fiber.

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Questions 19

Which data center network-critical physical infrastructure (NCPI) component has the ability to control relative humidity?

Options:

A.

Rack enclosure

B.

Fire suppression system

C.

Uninterruptible power supply (UPS)

D.

Computer room air conditioner (CRAC)

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Questions 20

How do blanking panels improve cooling within an enclosure?

Options:

A.

By increasing the mixture of hot and cold air

B.

By increasing air intake through vented doors

C.

By directing exhaust heat into IT equipment intakes

D.

By limiting the recirculation of air into IT equipment

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Questions 21

What would be a comprehensive strategy for protecting the most critical racks of a data center?

Options:

A.

Key access to the critical racks

B.

Video camera pointed directly at critical racks

C.

Iris scanner at the entrance to the data center

D.

Nested security perimeters with racks at the innermost level

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Questions 22

What are two key characteristics of a UPS? (Choose two.)

Options:

A.

It tests voltages on IT equipment.

B.

It safeguards data in the event of a power loss.

C.

It measures energy consumption of IT equipment.

D.

It transfers IT equipment from utility to battery power.

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Questions 23

What are three critical considerations when managing IT equipment operations at the rack level?

(Choose three.)

Options:

A.

Sound insulation

B.

Security breaches

C.

Generator availability

D.

Status of rack PDUs

E.

Power conditions of rack PDUs

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Questions 24

In which heat rejection system is the compressor located outside of the CRAC unit?

Options:

A.

Chilled water systems

B.

Water cooled systems

C.

Glycol cooled systems

D.

Air cooled self-contained systems

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Questions 25

What represents a direct cost of downtime when an outage occurs in the data center?

Options:

A.

Brand perception is damaged.

B.

Revenue streams are slowed or stopped.

C.

Data center personnel need to be retrained.

D.

Software needs to be upgraded to latest versions.

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Questions 26

Where should applications that use side-to-side cooling or high cable densities be installed?

Options:

A.

Seismic enclosure

B.

600 mm enclosures

C.

750 mm enclosures

D.

Wall-mount enclosures

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Questions 27

What is the problem with oversizing the UPS system within a data center?

Options:

A.

It limits the growth capacity of the data center.

B.

It decreases the mean time to recover (MTTR).

C.

It increases the number of single points of failure.

D.

It drives excessive capital and maintenance expenses.

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Questions 28

Which two does the network-critical physical infrastructure (NCPI) management system monitor at the rack level? (Choose two.)

Options:

A.

The monitoring of a chiller at the rack level.

B.

The monitoring of comfort cooling at the rack level.

C.

The monitoring of supplemental cooling devices at the rack level.

D.

The monitoring of rack based transfer switches at the rack level.

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Questions 29

Which UPS configuration has the highest availability?

Options:

A.

Capacity

B.

Parallel redundant

C.

Isolated redundant

D.

Distributed redundant

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Questions 30

Which two choices would ease the maintenance and serviceability of equipment in a data center? (Choose two)

Options:

A.

Underfloor cabling

B.

Proper cable management

C.

Split rear doors to allow for easier access

D.

Unique enclosures to meet specific equipment needs

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Questions 31

What makes network-critical physical infrastructure (NCPI) management different from traditional building management systems?

Options:

A.

Availability of safety resources

B.

Safety of the people in the building

C.

Availability of computing resources

D.

Comfort of the people in the building

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Questions 32

Which UPS topology uses a transfer switch between the primary power source and the inverter?

Options:

A.

Standby

B.

High speed relay

C.

Delta conversion online

D.

Double conversion online

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Questions 33

How do enclosures improve rack system cooling?

Options:

A.

By improving natural air flow

B.

By improving fire suppression

C.

By allowing hot and cold air to mix together

D.

By preventing hot and cold air from mixing together

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Questions 34

Which rack / enclosure would be used for limited space with just one or two pieces of small equipment?

Options:

A.

Seismic enclosure

B.

Four post open frame

C.

Wall-mount enclosure

D.

Free-standing enclosure

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Questions 35

What is an advantage of ceiling mount systems?

Options:

A.

They plug into wall outlets

B.

They provide the highest capacity units

C.

They rapidly redeploy to a different location

D.

They do not take away from IT equipment space

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Questions 36

Which two characteristics do all static UPS topologies share? (Choose two.)

Options:

A.

A battery

B.

An inverter

C.

A transfer switch

D.

A single-phase input

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Questions 37

Which statement describes a key characteristic of humidity?

Options:

A.

Air temperature does not affect air water vapor content.

B.

As temperature increases, the air can hold more water vapor.

C.

As the temperature increases, the air can hold less water vapor.

D.

As the temperature decreases, the air can hold more water vapor.

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Questions 38

Which temperature range is optimal for the proper function of a data center?

Options:

A.

62-65F (17-18C)

B.

72-75F (22-24C)

C.

82-85F (28-29C)

D.

92-95F (33-35C)

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Questions 39

When monitoring humidity levels in the data center, where is the single most important place to measure the humidity?

Options:

A.

Above the rack

B.

Below the rack

C.

The air intake on IT equipment

D.

The exhaust air coming out of the back of the IT equipment

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Questions 40

What is the most likely cause of unreliability in biometric technology?

Options:

A.

Spoofing by an imposter

B.

Failure of the scanning device

C.

Failure to recognize a legitimate user

D.

Incorrect recognition (user recognized as the wrong person)

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Questions 41

Which statement illustrates a characteristic of nominal voltage?

Options:

A.

Nominal voltage is the voltage reference published by the power company.

B.

In most geographies, nominal voltage is fixed at either 380 V or 460 V.

C.

Nominal voltage is calculated based upon the load characteristics of the end user.

D.

Nominal voltage is the voltage that is supplied to the building and factors in power distribution losses.

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Questions 42

The power draw from a three-phase UPS is measured using a true RMS voltmeter. The meter reads 10 kW as well as 10 kVA.

Why are the watts and volt-amps the same?

Options:

A.

The RMS voltage is 208 VAC.

B.

The three-phases are balanced.

C.

The power factor is equal to one.

D.

Each of the three-phases are synchronized.

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Questions 43

Why is the claim that "product X is 99.99% reliable" inaccurate?

Options:

A.

No tier level has been stated.

B.

99.99% is theoretically impossible.

C.

A timeframe has not been provided.

D.

Reliability cannot be quantified to four significant digits.

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Questions 44

What defines a delta to wye transformer?

Options:

A.

Takes in three-phases and ground; outputs three-phases and ground

B.

Takes in three-phases, neutral, and ground; outputs three-phases and ground

C.

Takes in three-phases and ground; outputs three-phases, neutral, and ground

D.

Takes in three-phases, neutral, and ground; outputs three-phases, neutral, and ground

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Questions 45

What is a disadvantage of an 'N' or capacity UPS configuration when compared to the other configurations?

Options:

A.

Not scalable

B.

Not redundant

C.

Most difficult to design

D.

Most recent design that is not yet widely accepted

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Questions 46

What is the unit of measurement of the electrical resistance of a circuit?

Options:

A.

Volt

B.

Amp

C.

Ohm

D.

Frequency

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Questions 47

What is one cause of oscillatory transients?

Options:

A.

Lightning strikes

B.

Non-unity power factors

C.

Motors turning on and off

D.

Static electricity discharges

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Questions 48

Which cooling architecture attempts to eliminate hot spots within the data center by utilizing large volumes of air mixing throughout the space?

Options:

A.

Row

B.

Rack

C.

Room

D.

Ceiling

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Exam Code: DU0-001
Exam Name: Data Center University Associate Certification
Last Update: May 2, 2024
Questions: 325
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