AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A global enterprise operates its workloads within a multi-account AWS Organization with consolidated billing enabled. Their compute footprint includes:
A stable fleet of m5.2xlarge EC2 instances in us-east-1 that will run continuously for at least three years.
A growing set of microservices on AWS Fargate in eu-west-1 and ap-southeast-2.
Several data-processing functions running on AWS Lambda worldwide.
The company projects a steady, aggregate compute spend of at least $50 per hour for the next three years, but the services and Regions used for modern workloads may change. A solutions architect must devise a purchasing strategy that maximizes long-term discounts while retaining future flexibility.
Which approach best meets these requirements?
Purchase a single 3-year Compute Savings Plan to cover the entire $50/hour commitment, ensuring maximum flexibility for all current and future compute services.
Purchase 3-year Standard Reserved Instances for the m5.2xlarge instances in us-east-1 and recommend using Spot Instances for all Fargate and Lambda workloads to achieve the lowest possible costs.
Purchase a 3-year EC2 Instance Savings Plan for the m5 family in us-east-1 to cover the legacy application's usage. For the remaining consistent spend, purchase a 3-year Compute Savings Plan to cover the Fargate and Lambda usage.
Purchase a single 3-year EC2 Instance Savings Plan for the m5 family in us-east-1 large enough to cover the company's entire $50/hour commitment.
The optimal approach is to layer an EC2 Instance Savings Plan (EC2 ISP) with a Compute Savings Plan (CSP).
EC2 Instance Savings Plan for the legacy fleet - A three-year, all-upfront (or partial-upfront) EC2 ISP for the m5 family in us-east-1 secures the largest possible discount-up to 72 percent-on the portion of spend that is certain and unchanging.
Compute Savings Plan for everything else - A three-year CSP covers the remaining hourly commitment. A CSP automatically applies (up to 66 percent off) to any EC2 family, AWS Fargate, or AWS Lambda usage in any Region, providing the flexibility required for evolving microservices and serverless workloads.
Why the other options are less effective:
Single CSP only - Achieves flexibility but sacrifices the deeper discount available for the predictable m5 workload.
Single EC2 ISP for the full $50/hour - Discounts only m5 usage; Fargate and Lambda would still be billed at On-Demand rates.
Standard RIs for EC2 plus Spot for Fargate/Lambda - Standard RIs can match the EC2 ISP discount but still do not apply to Fargate or Lambda, and Spot Instances are interruptible and unsuitable for baseline, always-on microservice and data-processing workloads.
Combining an EC2 ISP with a CSP therefore maximizes savings on the fixed portion while preserving broad flexibility for the dynamic portion.
Ask Bash
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What is the difference between an EC2 Instance Savings Plan (EC2 ISP) and a Compute Savings Plan (CSP)?
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How do AWS Savings Plans differ from Reserved Instances (RIs)?
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Why are Spot Instances not recommended for baseline workloads like Fargate and Lambda microservices?
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AWS Certified Solutions Architect Professional SAP-C02
Design for New Solutions
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