SAP-C02 Question #255: Real Exam Question with Answer & Explanation

Question

A company runs many workloads on AWS and uses AWS Organizations to manage its accounts. The workloads are hosted on Amazon EC2, AWS Fargate, and AWS LambdA. Some of the workloads have unpredictable demand. Accounts record high usage in some months and low usage in other months. The company wants to optimize its compute costs over the next 3 years. A solutions architect obtains a 6-month average for each of the accounts across the organization to calculate usage. Which solution will provide the MOST cost savings for all the organization's compute usage?

Options

• APurchase Reserved Instances for the organization to match the size and number of the most
• BPurchase a Compute Savings Plan for the organization from the management account by using
• CPurchase Reserved Instances for each member account that had high EC2 usage according to
• DPurchase an EC2 Instance Savings Plan for each member account from the management

Explanation

To achieve the most cost savings for diverse and unpredictable compute workloads (EC2, Fargate, Lambda) across an AWS Organization over 3 years, a centralized Compute Savings Plan is the optimal solution.

Common mistakes.

• A. Reserved Instances are less flexible than Compute Savings Plans as they are specific to instance family, size, Region, and OS, and they do not cover Fargate or Lambda usage.
• C. Purchasing Reserved Instances for individual member accounts does not fully leverage the consolidated billing of AWS Organizations for optimal savings, and RIs are less flexible than Savings Plans for varied compute types.
• D. An EC2 Instance Savings Plan only covers EC2 usage, not Fargate or Lambda, making it less comprehensive than a Compute Savings Plan for an organization with diverse compute types.

Concept tested. AWS Cost Optimization with Compute Savings Plans in AWS Organizations

Reference. https://aws.amazon.com/savingsplans/compute-savings-plans/

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