Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 290 discussion

There is a little trap here, because in the way this question is asked, both B and C are true since we don't know if it's production or not. In a production environment C is absolutely forbidden and B is the good solution, we even have questions in this dump about this case. In a dev environment spot instances are good if you don't care about stability so C can be a good answer. Since this question is all about cost, let's go for the stingy rat solution, spot instances are cheaper, so C is correct.

By using a mix of On-Demand Instances and Spot Instances, the company can leverage the cost-effectiveness of Spot Instances for parts of their workload while ensuring the availability and reliability of On-Demand Instances for critical components. This approach allows for cost optimization without sacrificing performance or reliability.

On-demand + spot for additional capacity will save costs.

On-Demand.

Any one have dumps

It's about COST, not operational efficiency for this question :) C is correct

A mix of On-Demand Instances to handle baseline workload and Spot Instances to handle excess workload.

Exam topic is not free anymore. Anyone has free access ?

By combining On-Demand Instances for steady-state workloads or critical components and Spot Instances for less critical or burstable workloads, you can achieve a balance between cost savings and performance. This strategy allows you to optimize costs without making a long-term commitment, as Spot Instances provide cost savings without the need for upfront payments or long-term contracts.

It's about COST, not operational efficiency for this question.

Autoscaling with ALB / scale up on demand using on demand and spot instance combination makes sense. Reserved will not fit the no-long term commitment clause.

Without commitment....Spot instances

If the company wants to optimize cost savings without making a long-term commitment, then using only On-Demand Instances may not be the most cost-effective option. Spot Instances can be significantly cheaper than On-Demand Instances, but they come with the risk of being interrupted if the Spot price increases above your bid price. If the company is willing to accept this risk, a mix of On-Demand Instances and Spot Instances may be the best option to optimize cost savings while maintaining the desired level of scalability. However, if the company wants the most predictable pricing and does not want to risk instance interruption, then using only On-Demand Instances is a good choice. It ultimately depends on the company's priorities and risk tolerance.

It's about COST, not operational efficiency for this question.

Should be C

https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-mixed-instances-groups.html

C - WEB apps , mostly Stateless , and ASG support OnDemand and Spot mix , in fact , you can prioritize to have Ondemand , before it uses Spot > https://docs.aws.amazon.com/autoscaling/ec2/userguide/launch-template-spot-instances.html