Exin CDCS Practice Test Questions Answers

ANSI/TIA-942 defines ratings across four areas:

Architectural

Electrical

Mechanical

Telecommunications (network cabling + architecture)

A data center cannot be considered Rated-3 unless all four areas meet the concurrent maintainability criteria. For telecom/networking, this means dual redundant backbone cabling, proper pathways, and separate routes to ensure no single point of failure.

A and B are incorrect because they limit scope to electrical/mechanical or cabling only.

C is incomplete: administration (ANSI/TIA-606) is part of compliance but architecture redundancy is mandatory.

Raised floors must not be installed flush against perimeter walls. Buildings expand, contract, and shift due to thermal expansion (hygrothermal movement), structural settlement, and seismic activity. If the raised floor is rigidly connected to the walls, this movement transfers directly into the raised floor grid, causing buckling, cracking, or tile misalignment.

Industry standards (e.g., CISCA – Ceilings & Interior Systems Construction Association guidelines) require leaving a small perimeter gap (typically 1–2 cm) between raised floor tiles and walls. This gap is then sealed with flexible firestops or brush gaskets to control air leakage while preserving movement tolerance.

Therefore, the correct practice is to leave a separation space, making answer C correct. Options A and D restrict this requirement incorrectly, while B is factually wrong (sealing against the perimeter is not allowed).

MPO connectors are multi-fiber connectors that support 12, 24, or more fibers in a single connector. Their key advantage is enabling parallel optics—where multiple fibers transmit simultaneously. This makes them ideal for 40GBASE-SR4 and 100GBASE-SR10 Ethernet links.

With OM4 or OM5 fiber, MPO cabling supports short-reach high-speed links in modern data centers.

Option A is incorrect; MPO works with OM3/OM4/OM5.

Option C is misleading; all connectors degrade with repeated use.

Option D is false because MPO is optical-only.

The real advantage is parallel multi-fiber transmission in one connector, simplifying cabling for high-speed networking.

A halocarbon gas-based fire suppression system primarily extinguishes fires through heat absorption. In contrast, an inert gas-based system works by reducing oxygen levels to a point where combustion cannot be sustained. Halocarbon agents, like FM-200, absorb heat from the fire, cooling it down, whereas inert gases, like nitrogen or argon, lower oxygen concentration.

Detailed Explanation:

Halocarbons are effective in quickly cooling flames and are suitable for electronic environments due to their fast action. Inert gases displace oxygen to suppress fires, making them ideal in occupied spaces where human safety can be managed during a fire event due to slower discharge times.

EPI Data Center Specialist References:

EPI training distinguishes between these suppression mechanisms, noting the importance of selecting the correct system based on specific needs like quick response versus oxygen displacement for environments with sensitive equipment.

In a data center with noise levels of 91 dB (A), employers are indeed required to take precautions to protect personnel, as this level exceeds commonly accepted safety thresholds for occupational noise exposure. Regulations, such as those from the Occupational Safety and Health Administration (OSHA) or similar agencies, mandate specific controls and protections for environments with high noise levels.

Detailed Explanation:

Noise levels above 85 dB (A) typically trigger requirements for hearing conservation programs. At 91 dB (A), steps like providing ear protection, conducting regular noise assessments, and possibly implementing engineering controls to reduce noise should be taken. Extended exposure to such levels can lead to hearing loss, so regulatory compliance ensures both immediate and long-term protection for personnel.

EPI Data Center Specialist References:

EPI guidelines for data center safety address noise exposure as part of the environmental safety measures. EPI recommends adhering to local occupational health regulations, as excessive noise can harm personnel and affect operational efficiency due to potential health hazards.