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Sample EXIN CDCS Practice Questions
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1According to the Uptime Institute Tier Classification System, which tier is the first to require concurrent maintainability?
A.Tier I
B.Tier II
C.Tier III
D.Tier IV
Explanation: Tier III is the 'Concurrently Maintainable' tier. It introduces multiple independent distribution paths so that any single capacity component or distribution element can be taken offline for planned maintenance without interrupting IT operations.
2Which Uptime Institute tier is described as 'Fault Tolerant' and typically uses a 2N (or N+N) topology?
A.Tier I
B.Tier II
C.Tier III
D.Tier IV
Explanation: Tier IV is the Fault Tolerant level. It uses simultaneously active, fully redundant distribution paths (a 2N or N+N model) so that any single unplanned failure is tolerated without affecting the IT load.
3A Tier I data centre under the Uptime Institute classification provides approximately what level of availability?
A.99.671%
B.99.741%
C.99.982%
D.99.995%
Explanation: Tier I (Basic Capacity) corresponds to approximately 99.671% availability, equating to about 28.8 hours of downtime per year. It has a single, non-redundant power and cooling path.
4In the TIA-942 facility rating system, what does a Rated-4 data centre require for power, cooling and telecommunications distribution?
A.A single distribution path
B.One active and one standby path (N+1)
C.Dual active paths (2N / N+N)
D.Redundant components on a single path
Explanation: TIA-942 Rated-4 (Fault Tolerant) requires, at minimum, dual active (2N / N+N) distribution paths for power, cooling and telecommunications so a single fault or planned maintenance cannot interrupt operations.
5Which standard is the primary 'Telecommunications Infrastructure Standard for Data Centers'?
A.ISO 27001
B.ANSI/TIA-942
C.NFPA 70
D.ASHRAE 90.4
Explanation: ANSI/TIA-942 is the Telecommunications Infrastructure Standard for Data Centers. It specifies requirements and a four-level resiliency rating covering telecommunications, electrical, architectural and mechanical infrastructure.
6When selecting a data centre site, which of the following is generally considered the MOST important environmental risk to avoid?
A.Proximity to a major highway
B.Location within a flood-prone zone
C.Distance from the nearest airport
D.Presence of nearby office buildings
Explanation: Locating a data centre in a flood-prone zone is a primary site-selection risk because water ingress can cause catastrophic and prolonged outages. Standards such as TIA-942 recommend avoiding 100-year flood plains and other natural-hazard areas.
7Which TIA-942 cabling space aggregates the core switches and routers and is the central point of the structured cabling system?
A.Equipment Distribution Area (EDA)
B.Horizontal Distribution Area (HDA)
C.Main Distribution Area (MDA)
D.Zone Distribution Area (ZDA)
Explanation: The Main Distribution Area (MDA) is the central space that houses core routers, core switches and the main cross-connect. All backbone cabling radiates from the MDA, making it the heart of the data centre cabling topology.
8What is the main purpose of a raised access floor in a traditional data centre design?
A.To increase the structural load rating of the slab
B.To create a plenum for cooling air and cable routing
C.To isolate the building from seismic activity
D.To reduce the floor-to-ceiling height
Explanation: A raised access floor creates an underfloor plenum used to distribute cooled supply air to equipment and to route power and data cabling. Perforated tiles in cold aisles deliver the conditioned air to the racks.
9Under the Uptime Institute system, Tier II is best described as providing what?
A.Basic capacity with no redundancy
B.Redundant capacity components on a single distribution path
C.Concurrent maintainability via multiple paths
D.Full fault tolerance with active dual paths
Explanation: Tier II is the Redundant Capacity Components tier. It adds N+1 redundancy on critical capacity components (such as UPS modules and generators) but retains a single, non-redundant distribution path.
10In data centre space planning, what is the primary function of the 'white space'?
A.Office and administrative areas
B.The area housing IT equipment racks
C.Mechanical and electrical plant rooms
D.Loading dock and storage areas
Explanation: White space is the area of a data centre dedicated to housing IT equipment — racks, cabinets, servers, storage and network gear — along with the cooling and power distribution serving them directly. It is the revenue-generating raised-floor area.
About the EXIN CDCS Practice Questions
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