CV0-004 Cloud Architecture and Design Practice Question
A company runs a stateless web application on AWS EC2 instances behind an Application Load Balancer. The application experiences varying traffic patterns, with spikes on weekdays. The company wants to minimize costs while ensuring performance during spikes. Which combination of purchasing options and scaling strategy 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
✓
Reserved instances for baseline capacity and on-demand instances for spikes
Using spot instances for the baseline capacity is risky because spot instances can be interrupted, causing instability. Reserved instances provide a discount for steady-state usage, and on-demand instances handle spikes. Auto-scaling with on-demand only would be more expensive. Spot instances for the entire workload are unreliable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Spot instances for all capacity with a large buffer
Why it's wrong here
Spot instances are unreliable and may be interrupted, risking application availability.
- ✗
On-demand instances for baseline and reserved instances for spikes
Why it's wrong here
Reserved instances are for steady usage, not spikes; you pay for them regardless of usage.
- ✗
Reserved instances for baseline capacity and spot instances for spikes
Why it's wrong here
Spot instances can be reclaimed, causing disruption during spikes.
- ✓
Reserved instances for baseline capacity and on-demand instances for spikes
Why this is correct
Reserved instances cover predictable load, reducing cost; on-demand instances handle variable spikes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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