Certified Data Centre Specialist

Here you have the best Exin CDCS practice exam questions

You have 59 total questions to study from
Each page has 5 questions, making a total of 12 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on January 4, 2026
This site is not affiliated with or endorsed by Exin.

Question 1 of 59

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 adequate amount of CFM/CMH at a reasonable velocity.
- The pressure under the raised floor is approximately 25 Pa/0.1 inch H20.
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

Correct Answer: A

Question 2 of 59

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.

Correct Answer: C

Question 3 of 59

The location of a data center is just above the Arctic Circle (North Pole). The outside air temperature is never above 21 °C/70 °F.
Taking energy efficiency as the highest priority, which cooling system should you recommend?

Standard air conditioning units, as spares might be not readily available

Any cooling system can be efficient, because the outside air temperature will not influence the temperature of the air intake of the ICT equipment

Waterside economizer

Airside economizer

Correct Answer: D

Question 4 of 59

When are the wet bulb’s and dry bulb’s temperature identical?

When the dry bulb’s temperature is at the lowest allowable temperature for IT equipment as per the ASHRAE

When the dry bulb’s temperature is at the highest allowable temperature for IT equipment as per the ASHRAE

When the relative humidity is at the best practice value for relative humidity, being 50% RH

When the relative humidity is 100%

Correct Answer: D

Question 5 of 59

An air-conditioner unit needs to be selected. Two types are available:
- Unit-A has a Sensible Heat Ratio (SHR) of 0.7.
- Unit-B has a Sensible Heat Ratio (SHR) of 0.9.
From an efficiency point of view, which one should be selected?

It does not matter, as the Sensible Heat Ratio has nothing to do with efficiency.

Not relevant, as Sensible Heat Ratio is only specified for air-conditioner equipment to indicate the ratio between intake temperature and exhaust temperature.

Unit A

Unit B

Correct Answer: D