AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A web application has a baseline usage pattern with predictable spikes during weekends. The spikes can be 5 times the normal load, and the application must scale accordingly. The company wishes to optimize costs while ensuring availability during peak times. Which combination of purchasing options should a Solutions Architect recommend for the most cost-effective architecture?
A full Savings Plan to cover all instance usage
Reserved Instances for baseline traffic and On-Demand Instances for spikes
A combination of Spot Instances for baseline traffic and On-Demand Instances for spikes
Using On-Demand Instances for both baseline and peak loads
For predictable baseline usage, Reserved Instances provide a significant discount compared to On-Demand pricing in exchange for a commitment to a consistent amount of compute capacity. To handle the variable peak loads during weekends, On-Demand Instances or Spot Instances can be used. Given the need for availability during peak times, relying solely on Spot Instances which can be interrupted is risky; therefore, a mix of Reserved Instances for the baseline and On-Demand Instances to handle peaks can be the most cost-effective and reliable approach as it provides cost savings for the predictable demand and flexibility to scale with reliable instances during spikes.
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