CDCP MCQ 5 — Questions and Answers
Question 1: What is the key difference between RPO and RTO in a data centre disaster recovery plan?
- RPO measures recovery speed; RTO measures data loss tolerance
- RPO is the maximum acceptable data loss; RTO is the maximum acceptable downtime duration (Correct answer)
- RPO applies to hardware; RTO applies to software recovery
- RPO is set by regulators; RTO is set by the business
Correct answer: RPO is the maximum acceptable data loss; RTO is the maximum acceptable downtime duration
RPO (Recovery Point Objective) defines how much data loss is acceptable, while RTO (Recovery Time Objective) defines how quickly systems must be restored.
Question 2: In a data centre, what does the term 'Critical Load' refer to?
- The maximum power the utility can supply to the building
- The IT equipment power consumption that must be protected by UPS (Correct answer)
- The total power used by all cooling systems
- The emergency generator capacity rating
Correct answer: The IT equipment power consumption that must be protected by UPS
Critical load refers to the IT equipment power that must be continuously protected and supported by the UPS and backup power systems.
Question 3: Which cooling technology uses water circulated directly to the server rack or even to individual components to remove heat?
- Computer room air conditioning (CRAC)
- Evaporative cooling
- Liquid cooling (direct liquid cooling) (Correct answer)
- Free cooling / economizer mode
Correct answer: Liquid cooling (direct liquid cooling)
Direct liquid cooling (DLC) brings chilled water or coolant directly to the heat source—rear-door heat exchangers, cold plates, or immersion tanks.
Question 4: What is the purpose of a 'hot standby' generator configuration in a data centre?
- The generator runs continuously at full load alongside utility power
- The generator is running and warmed up, ready to accept load within seconds (Correct answer)
- The generator is cold and starts automatically only upon utility failure
- The generator provides power to non-critical loads only
Correct answer: The generator is running and warmed up, ready to accept load within seconds
A hot standby generator is already running and synchronized, enabling near-instantaneous load transfer with minimal transition time.
Question 5: Which metric represents the inverse of PUE and expresses data centre efficiency as a percentage?
- ERE (Energy Reuse Effectiveness)
- DCiE (Data Centre Infrastructure Efficiency) (Correct answer)
- CUE (Carbon Usage Effectiveness)
- GEC (Green Energy Coefficient)
Correct answer: DCiE (Data Centre Infrastructure Efficiency)
DCiE = (IT Equipment Power ÷ Total Facility Power) × 100, so a PUE of 1.5 equals a DCiE of 66.7%.
Question 6: In data centre cabling infrastructure, what does the term 'structured cabling' refer to?
- Cabling installed only in a raised floor plenum
- A standardized, hierarchical cabling system following defined topology and components (Correct answer)
- Fiber optic cabling used exclusively for storage networks
- Temporary cabling used during data centre construction
Correct answer: A standardized, hierarchical cabling system following defined topology and components
Structured cabling is a standardized approach with defined subsystems (horizontal, backbone, work area) enabling any-to-any connectivity and easy moves, adds, and changes.
Question 7: What is a primary reason data centres implement blanking panels in server racks?
- To protect unused rack space from dust accumulation
- To prevent hot exhaust air from recirculating back into the cold aisle intake (Correct answer)
- To provide additional structural rigidity to tall rack cabinets
- To meet electrical code requirements for unused circuit breaker slots
Correct answer: To prevent hot exhaust air from recirculating back into the cold aisle intake
Blanking panels seal empty rack spaces to prevent hot air from the rear of the rack from short-circuiting back to the front cold air intake.
CDCP MCQ 5
What is the key difference between RPO and RTO in a data centre disaster recovery plan?