A company is running a large fleet of Amazon EC2 instances. They want to optimize costs without impacting performance. They have identified that many instances have predictable usage, but some workloads are fault-tolerant and can be interrupted. The company also has a significant amount of data transfer between Availability Zones. Which combination of strategies will maximize cost savings? (Select THREE)

Answer options:

Purchase Compute Savings Plans for the predictable workloads.

Use Spot Instances for the fault-tolerant workloads.

Keep traffic within the same Availability Zone where possible.

Use Dedicated Hosts for all instances to reduce licensing costs.

Migrate all instances to the previous generation instance types (e.g., M4 instead of M5).

Use AWS Transit Gateway to route all traffic between instances in the same VPC.

How to approach this question

Identify standard cost optimization pillars: commitments (Savings Plans), Spot, and avoiding data transfer fees.

Full Answer

Purchase Compute Savings Plans for the predictable workloads. Use Spot Instances for the fault-tolerant workloads. Keep traffic within the same Availability Zone where possible.

Cost optimization on AWS involves using the right pricing models (Savings Plans for baseline, Spot for fault-tolerant) and optimizing architecture (minimizing cross-AZ data transfer, which costs $0.01/GB in each direction).

Common mistakes

Assuming older instance types are cheaper/better.

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Practice the full AWS Solutions Architect Professional SAP-C02 Practice Exam 4

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