CDCP MCQ 2 — Questions and Answers
Question 1: What does PUE stand for in data centre efficiency metrics?
- Power Usage Effectiveness (Correct answer)
- Processor Unit Efficiency
- Peak Utilization Estimate
- Power Unit Expenditure
Correct answer: Power Usage Effectiveness
PUE (Power Usage Effectiveness) is the ratio of total facility power to IT equipment power, where 1.0 is perfect efficiency.
Question 2: Which cooling approach delivers cold air directly to server intakes via enclosed channels between cabinet rows?
- Perimeter cooling
- Hot aisle/cold aisle containment (Correct answer)
- Overhead cooling
- In-row cooling
Correct answer: Hot aisle/cold aisle containment
Hot aisle/cold aisle containment separates exhaust and intake air streams to prevent mixing and improve cooling efficiency.
Question 3: In data centre design, what is the purpose of an N+1 redundancy configuration?
- To double all capacity for load balancing
- To provide one additional component beyond minimum required for operation (Correct answer)
- To eliminate single points of failure entirely
- To reduce power consumption by 50%
Correct answer: To provide one additional component beyond minimum required for operation
N+1 redundancy means one extra component exists beyond the minimum needed (N), allowing one failure without service interruption.
Question 4: What is the primary function of a DCIM (Data Centre Infrastructure Management) system?
- Managing network routing protocols
- Monitoring and managing physical data centre assets, power, and cooling (Correct answer)
- Handling virtual machine provisioning
- Controlling firewall security policies
Correct answer: Monitoring and managing physical data centre assets, power, and cooling
DCIM tools provide real-time visibility and management of physical infrastructure including power, cooling, space, and assets.
Question 5: Which Uptime Institute Tier level requires all components to be fully redundant with no single points of failure?
- Tier I
- Tier II
- Tier III
- Tier IV (Correct answer)
Correct answer: Tier IV
Tier IV (Fault Tolerant) requires 2N redundancy and can sustain any planned or unplanned event without impact to critical load.
Question 6: What is the recommended temperature range for data centre cold aisles according to ASHRAE guidelines?
- 50–59°F (10–15°C)
- 59–77°F (15–25°C)
- 64–80°F (18–27°C) (Correct answer)
- 80–95°F (27–35°C)
Correct answer: 64–80°F (18–27°C)
ASHRAE A1 class guidelines recommend inlet temperatures of 64–80°F (18–27°C) for most data centre IT equipment.
Question 7: A data centre's critical load is 500 kW and total facility power is 750 kW. What is the PUE?
- 0.67
- 1.25
- 1.50 (Correct answer)
- 2.50
Correct answer: 1.50
PUE = Total Facility Power ÷ IT Equipment Power = 750 kW ÷ 500 kW = 1.5.
CDCP MCQ 2
What does PUE stand for in data centre efficiency metrics?