CLF-C02 Billing, Pricing, and Support Practice Question
A company is evaluating whether to use AWS Compute Savings Plans or EC2 Instance Savings Plans. Which statement correctly describes when EC2 Instance Savings Plans provide the highest discount?
⚠ Common exam trap
Watch out — candidates often assume 'highest discount' always means 'most flexible,' but EC2 Instance Savings Plans trade flexibility for deeper savings, so the correct answer requires recognizing that commitment to a single instance family and Region yields the maximum discount.
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
✓
When the workload uses a consistent instance family within a single Region
EC2 Instance Savings Plans offer the highest discount (up to 72% compared to On-Demand) because they require a commitment to a specific instance family within a single AWS Region. This allows AWS to optimize capacity planning and pass greater savings to the customer, whereas Compute Savings Plans are more flexible but provide lower discounts (up to 66%).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
When the workload spans multiple AWS Regions
Why it's wrong here
EC2 Instance Savings Plans are purchased for a specific AWS Region; if your workload spans multiple regions, you would need a separate commitment per region, which fragments your savings and reduces overall flexibility. Compute Savings Plans apply across all regions, allowing you to cover multi-region compute usage with a single plan.
- ✓
When the workload uses a consistent instance family within a single Region
Why this is correct
EC2 Instance Savings Plans provide the highest discount (up to 72% off On-Demand) when you commit to a consistent instance family (e.g., M5 or C5) in a single AWS Region for a 1- or 3-year term. Because the workload is predictable and locked to that family and region, you can trade flexibility for maximum savings, making this the optimal scenario for this plan type.
- ✗
When the workload uses multiple instance families
Why it's wrong here
A workload using multiple instance families (e.g., mixing C5 for compute and R5 for memory) would rarely fit EC2 Instance Savings Plans, which lock you to a single family. Compute Savings Plans offer automatic coverage across any instance family, size, OS, and tenancy, and although their discount is slightly lower (up to 66%), they provide the flexibility needed for multi-family workloads.
- ✗
When the workload runs on AWS Fargate
Why it's wrong here
Fargate is a serverless container compute engine that does not bill as an EC2 instance, so EC2 Instance Savings Plans cannot be applied to it. Compute Savings Plans, however, automatically cover Fargate usage and AWS Lambda along with EC2 instances, making them the appropriate choice for Fargate-based workloads.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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