SAP-C02 Design for New Solutions Practice Question
A company is designing a cost-effective architecture for a batch processing job that runs nightly. The job can tolerate interruptions and requires significant compute power for a few hours. The company wants to minimize costs. Which TWO strategies should the company use?
⚠ Common exam trap
Candidates often choose Reserved Instances (Option B) thinking they are always cheaper for recurring workloads, but they fail to recognize that the low utilization (a few hours per night) makes On-Demand or Spot more cost-effective than a 1-year commitment.
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
✓
Use Spot Instances for compute.
Spot Instances (Option A) are ideal for this batch processing job because the job can tolerate interruptions and requires significant compute power for only a few hours nightly. Spot Instances offer up to 90% cost savings compared to On-Demand Instances by leveraging unused AWS EC2 capacity, making them the most cost-effective choice for fault-tolerant, time-flexible 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.
- ✓
Use Spot Instances for compute.
Why this is correct
Spot Instances are cost-effective and suitable for fault-tolerant batch jobs.
- ✗
Purchase Reserved Instances (RI) for a 1-year term.
Why it's wrong here
RIs require upfront commitment and are not ideal for variable workloads.
- ✓
Configure Auto Scaling to scale out during the job and scale in after.
Why this is correct
Auto Scaling ensures you only pay for what you use.
- ✗
Use On-Demand Instances to ensure availability.
Why it's wrong here
On-Demand is more expensive.
- ✗
Use Dedicated Hosts for compliance.
Why it's wrong here
Dedicated Hosts are costly and unnecessary.
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