SAA-C03 Question #505: Real Exam Question with Answer & Explanation

Question

A company has an application that runs only on Amazon EC2 Spot Instances. The instances run in an Amazon EC2 Auto Scaling group with scheduled scaling actions. However, the capacity does not always increase at the scheduled times, and instances terminate many times a day. A solutions architect must ensure that the instances launch on time and have fewer interruptions. Which action will meet these requirements?

Options

• ASpecify the capacity-optimized allocation strategy for Spot Instances. Add more instance types to
• BSpecify the capacity-optimized allocation strategy for Spot Instances. Increase the size of the
• CSpecify the lowest-price allocation strategy for Spot Instances. Add more instance types to the
• DSpecify the lowest-price allocation strategy for Spot Instances. Increase the size of the instances

Explanation

Spot Instances can be interrupted when AWS needs the capacity back. To reduce interruptions and improve availability, AWS provides the capacity-optimized allocation strategy. Capacity- optimized strategy launches Spot Instances from the most available Spot capacity pools instead of the lowest-priced ones, reducing interruption rates. By adding multiple instance types (e.g., using Instance Type Flexibility), the Auto Scaling group can launch instances in a broader set of pools, improving the chance that capacity is available. Scheduled scaling actions combined with a diverse set of instances under the capacity-optimized strategy ensure higher resilience and better timing for instance launches. This approach directly supports the Resiliency design principle in the AWS Well-Architected

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