CV0-004 Cloud Architecture and Design Practice Question
An organization wants to minimize costs for a batch processing workload that runs nightly for 2 hours and can tolerate interruptions. Which pricing model is most cost-effective?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Spot instances
Spot instances offer significant discounts but can be terminated; suitable for fault-tolerant, interruptible workloads.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
On-demand instances
Why it's wrong here
On-demand instances bill per second but carry the highest hourly rate and provide no interruption tolerance mechanism, so nightly batch runs cost more than reclaimable capacity. They suit short, unpredictable workloads that cannot tolerate termination, not cost-sensitive interruptible jobs.
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Reserved instances
Why it's wrong here
Reserved instances require a one- or three-year commitment and bill continuously regardless of use, so a two-hour nightly job pays for unused hours. They suit steady, predictable, always-on workloads, not interruptible batch processing that can absorb sudden termination.
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Dedicated hosts
Why it's wrong here
Dedicated hosts bill for the entire physical server continuously, including idle hours, so a two-hour nightly job pays roughly 24 hours of capacity. They suit licensing compliance or strict hardware isolation requirements, not interruptible batch work that can run on reclaimed capacity.
- ✓
Spot instances
Why this is correct
Spot instances exploit unused cloud capacity at steep discounts, satisfying the workload's tolerance for interruptions and its short nightly runtime. Because the batch job can resume after eviction, the risk of sudden reclamation is acceptable, making spot pricing markedly cheaper than on-demand or reserved capacity for this intermittent, fault-tolerant scenario.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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