CV0-004 Cloud Architecture and Design Practice Question
A company runs a stateless web application on AWS EC2 instances behind an Application Load Balancer. To reduce costs, they want to use the most cost-effective compute option that can handle variable traffic and be interrupted. Which pricing model should they use for the EC2 instances?
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 cost savings but can be interrupted, making them suitable for stateless, fault-tolerant workloads that can handle interruptions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Dedicated hosts
Why it's wrong here
Dedicated hosts are expensive and not needed for this workload.
- ✓
Spot instances
Why this is correct
Spot instances are cost-effective and suited for variable, interruption-tolerant workloads.
- ✗
Reserved instances
Why it's wrong here
Reserved instances are for steady-state workloads, not variable traffic.
- ✗
On-demand instances
Why it's wrong here
On-demand provides no interruption but is more expensive than spot.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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