Free EXIN EPI Certified Data Centre Specialist Exam CDCS Exam Practice Test

What is a significant difference between a halocarbon gas-based fire suppression system and an inert gas-based fire suppression system?

• Inert gas has smaller-sized gas containers than halocarbon gas.
• Inert gas harms the environment and halocarbon gas does not.
• Halocarbon gas works on the basis of heat removal and inert gas works on the basis of oxygen reduction.
• Halocarbon gas works on the basis of oxygen reduction and inert gas works on the basis of heat removal.

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

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.

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?

• Two feeds coming from two different substations, one power company is not acceptable
• Two feeds coming from two different substations, one power company is acceptable
• Two feeds entering the data center building from one substation
• One feed from one substation split over two separated distribution boards in separate rooms

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

A computer room needs to be fitted out with a gas-based fire suppression system. The computer room will be a high-density data center with about 30% of the racks being closed circuit cooling blade-center racks.Should the supplier of the fire suppression system be informed on the design of the racks?

• No, cooling and design of racks have no influence on the fire suppression system design.
• Only when the rack height obstructs a potential fire suppression release point.
• Yes, the design of the racks has an influence on the fire suppression system design.
• Only when the racks might block access to the fire panel.

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?

• No, as long as the equipment is less than 700 kg/1,500 lbs it will be within the limits.
• 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.
• Yes, additional floor loading calculations need to be done by the floor manager, which should be verified by the safety engineer.
• Yes, a structural engineer, approved/endorsed by the building owner, should carry out new floor loading calculations.

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

• Tiles with air deflectors or louvers can be very heavy.
• Tiles with air deflectors or louvers will reduce the cooling capacity of the tile.
• Tiles with air deflectors or louvers do not allow for a flexible cooling solution.
• Tiles with air deflectors or louvers can only be used to cool storage equipment.

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 EMF.
• The shielding material will increase its permeability factor.
• The shielding material will reach its maximum electrically charged state.

You have three UPS systems connected in parallel. The UPS systems have an imbalance in the loadsharing of approximately 20%. What should you recommend?

• Review the cable lengths of each UPS to the common busbar
• Nothing, there is no reason for any concern
• Review the common mode noise levels within the computer room
• Review the harmonics levels within the computer room