AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A global corporation utilizes AWS Organizations with consolidated billing enabled for all accounts. The company purchased several m5.2xlarge Standard Reserved Instances with a 1-year term to cover a stable, critical application running in the us-east-1 Region. The RIs were purchased in the central paying account, and RI sharing is enabled. A new project requires some member accounts to change their instances from m5.2xlarge to a mix of m5.xlarge and m5.4xlarge instances. The total compute capacity, measured in normalized units, will remain the same across the organization. A solutions architect needs to ensure the existing RI discount continues to apply to this new configuration with minimal operational overhead. What is the most cost-effective and operationally efficient recommendation?
Request to modify the existing RIs by splitting the m5.2xlarge reservations and then merging them to create new reservations that match the m5.xlarge and m5.4xlarge sizes.
Sell the existing m5.2xlarge Standard RIs on the Reserved Instance Marketplace and then purchase new RIs that precisely match the m5.xlarge and m5.4xlarge instance types.
Verify that the Standard RIs were purchased with a regional scope. If so, no further action is required as instance size flexibility will automatically apply the discount to other instance sizes within the m5 family.
Exchange the current Standard RIs for Convertible RIs to allow flexible reconfiguration that matches the new m5.xlarge and m5.4xlarge requirements.
The correct answer is to verify that the RIs have a regional scope. Regional Standard Reserved Instances for Linux/Unix with default tenancy automatically provide instance size flexibility, applying the discount to any combination of sizes in the same instance family (in this case, m5) within the Region. A single m5.2xlarge reservation (16 normalized units) can therefore cover either two m5.xlarge instances (8 units each) or provide a 50% discount to an m5.4xlarge (32 units). Because RI sharing is enabled for the organization, the billing benefit flows to matching usage in any member account without additional configuration.
Selling the RIs on the Marketplace and repurchasing them introduces administrative overhead and price risk. Converting the Standard RIs to Convertible RIs would reduce the potential discount and still require manual exchanges, offering no advantage when only the instance size-not the family, platform, or tenancy-needs to change. Manually modifying the Standard RIs by splitting and merging is unnecessary because instance size flexibility already applies the discount automatically.
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AWS Certified Solutions Architect Professional SAP-C02
Design Solutions for Organizational Complexity
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