Certified Data Center Professional Practice Questions
Prepare for CDCP-001 with more than an answer.
- Exam fee
- $150 USD
- Level
- Professional
- Valid for
- Lifetime
Domains covered on the exam 5
- Fundamentals of Availability20%
- Fire Protection Methods in Data Center20%
- Cabling Strategies for Data Centers20%
- Fundamentals of Cooling I20%
- Fundamentals of Cooling II: Humidity in Data Center20%
- 1
A hospital is building a new data center to house critical patient records and life-support system monitoring. The board has mandated that there be no single points of failure in any part of the infrastructure and that the facility must be concurrently maintainable. Which Uptime Institute Tier level does this requirement describe?
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Correct answer: C
The key requirements described are the defining characteristics of a Tier III data center. Tier III facilities are 'Concurrently Maintainable,' meaning any planned maintenance activity can be performed on power and cooling systems without disrupting the IT operations. This is achieved through N+1 redundancy, which eliminates single points of failure for planned work. Tier IV adds 'Fault Tolerance' to this.
- 2
In a data center using a Top-of-Rack (ToR) cabling architecture, where are the access switches typically located?
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Correct answer: C
The defining characteristic of a Top-of-Rack (ToR) architecture is the placement of one or two access switches inside each server rack. Servers within that rack connect to these switches using short, manageable patch cords. The ToR switches then connect to aggregation switches, typically located in an End-of-Row or centralized location, using fiber optic cabling.
- 3
True or False: Zinc whiskers, microscopic conductive filaments that can grow from electroplated steel surfaces, pose a significant threat in data centers primarily because they can cause short circuits if they break off and land on electronic components.
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Correct answer: A
This statement is true. Zinc whiskers are a known risk, particularly from older raised floor tiles and hardware with zinc electroplating. These filaments are electrically conductive and can dislodge due to vibration or air currents. If they become airborne and settle on printed circuit boards or other electronics, they can bridge connections and cause intermittent or permanent short circuits, leading to equipment failure.
- 4
A data center has a total IT heat load of 150 kW. To select an appropriate CRAC unit, the cooling capacity needs to be converted to tons of refrigeration. Approximately how many tons of refrigeration are required to cool this load? (1 ton of refrigeration = 12,000 BTU/hr; 1 kW = 3,412 BTU/hr)
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Correct answer: B
First, convert the heat load from kW to BTU/hr: 150 kW * 3,412 BTU/hr/kW = 511,800 BTU/hr. Next, convert BTU/hr to tons of refrigeration: 511,800 BTU/hr / 12,000 BTU/hr/ton = 42.65 tons. This is approximately 42.7 tons.
- 5
A data center uses an End-of-Row (EoR) cabling architecture. A diagram of the layout is shown below. What is a primary disadvantage of this design compared to a Top-of-Rack (ToR) design?
graph TD subgraph Row 1 Rack1_1[Server Rack 1] Rack1_2[Server Rack 2] Rack1_3[...] Rack1_4[Server Rack N] end subgraph EoR Cabinet EoR_Switch[EoR Switch] end Rack1_1 -->|Long Copper Cable| EoR_Switch Rack1_2 -->|Long Copper Cable| EoR_Switch Rack1_4 -->|Long Copper Cable| EoR_SwitchShow answer details
Correct answer: B
In an EoR architecture, every server in the row must be connected back to the central switches in the EoR cabinet. This requires a large number of long copper patch cords running through overhead trays or underfloor plenums. This mass of cabling can be difficult to manage, can obstruct airflow, and is less flexible than a ToR design where most connections are short, in-rack links.
- 6
A financial services company is designing a new data center and requires an availability of 99.995%. The Chief Technology Officer has asked for the maximum allowable downtime per year to meet this service level agreement (SLA). What is the maximum total downtime permissible?
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Correct answer: B
To calculate the maximum allowable downtime for a 99.995% availability, you first determine the total minutes in a year (365 days * 24 hours/day * 60 minutes/hour = 525,600 minutes). The permissible downtime percentage is 100% - 99.995% = 0.005%. The maximum downtime is 525,600 minutes * 0.00005 = 26.28 minutes. This is closest to 26.3 minutes. The other options correspond to different availability levels (e.g., 52.6 minutes is 99.99%).
- 7
During a data center audit, it was discovered that the underfloor plenum is being used for both data cabling and as a cold air supply. Which standard is most directly violated by this practice if proper separation and management are not maintained?
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Correct answer: D
The TIA-942 standard for Telecommunications Infrastructure Standard for Data Centers provides specific guidelines on pathways and spaces. It strongly recommends separating power and data cables and advises against practices that can obstruct airflow, such as poorly managed cables in an underfloor plenum. While ASHRAE is concerned with airflow, TIA-942 directly addresses the cabling infrastructure itself. NFPA 75 deals with fire protection, and the Uptime Institute standard focuses on redundancy and fault tolerance.
- 8
A data center located in a region with high humidity is experiencing corrosion on server components. The facility uses a standard CRAC system. Which two actions should the data center manager prioritize to mitigate this issue? (Select TWO)
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Correct answer: B, D
- 9
True or False: A pre-action fire suppression system, double-interlock type, requires activation of both a detection device (e.g., smoke detector) and a sprinkler head before water is released into the protected area.
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Correct answer: A
This statement is true. A double-interlock pre-action system is designed for maximum protection against accidental water discharge. It requires two separate events to trigger: the fire detection system must activate, which opens the pre-action valve, AND a sprinkler head must fuse due to heat, which allows air pressure in the pipes to drop. Only when both conditions are met will water be released.
- 10
A data center's total facility power consumption is measured at 500 kW. The total power consumed by the IT equipment (servers, storage, networking) is 300 kW. What is the Power Usage Effectiveness (PUE) for this data center?
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Correct answer: A
Power Usage Effectiveness (PUE) is calculated by dividing the total facility power by the IT equipment power. In this case, PUE = 500 kW / 300 kW = 1.67. A PUE of 1.0 would represent a perfectly efficient data center where all power is used by the IT equipment.
