20+ practice questions focused on Cost and Performance Optimization — one of the most tested topics on the AWS Certified SysOps Administrator Associate SOA-C02 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Cost and Performance Optimization PracticeA SysOps administrator manages an Amazon RDS for MySQL instance that experiences high CPU utilization during business hours. The application is read-heavy. Which action will most effectively improve performance and reduce cost?
Explanation: Adding a read replica offloads read traffic from the primary RDS for MySQL instance, directly addressing the read-heavy workload and high CPU utilization. This improves performance by distributing SELECT queries to the replica, and reduces cost because you can use a smaller primary instance and only pay for the replica's resources when needed, rather than scaling up the entire instance.
A SysOps administrator manages a web application running on Amazon EC2 instances that run 24/7 for the next 12 months. The workload is steady and predictable. Which EC2 purchasing option provides the highest cost savings for this use case?
Explanation: Standard Reserved Instances provide the highest cost savings for a steady, predictable 24/7 workload over a 12-month period because they offer a significant discount (up to 72% compared to On-Demand) in exchange for a commitment to a specific instance family, region, and term length. Since the workload runs continuously without interruption, the upfront payment or partial upfront payment for a 1-year term maximizes savings without the risk of interruption or the need for flexibility.
A company runs a large number of EC2 instances across multiple accounts and regions. The finance team needs to track costs per project and department. Each EC2 instance must be tagged with a ProjectID and Department tag. A SysOps administrator needs to ensure that all newly launched EC2 instances are tagged automatically before they can be used, and that existing untagged instances are retroactively tagged. The tags must be propagated to cost reports in AWS Cost Explorer. Which combination of steps will achieve this with the least operational overhead?
Explanation: Option A is correct because AWS Config with auto-remediation can automatically tag newly launched EC2 instances using a custom Lambda function or SSM document triggered by a Config rule (e.g., 'required-tags'), ensuring compliance before instances are used. Activating the tags as cost allocation tags in AWS Cost Explorer allows the tags to appear in cost reports. For existing untagged instances, the Tag Editor with a CSV import provides a bulk, low-overhead method to retroactively apply tags across accounts and regions.
A company runs a batch processing application on Amazon EC2 that runs for 2 hours every night. The workload can tolerate interruptions. Which EC2 purchasing option provides the lowest cost for this use case?
Explanation: Spot Instances are the correct choice because the workload is fault-tolerant, runs for a fixed 2-hour window nightly, and can tolerate interruptions. Spot Instances offer significant cost savings (up to 90% off On-Demand) by using spare EC2 capacity, which aligns perfectly with a batch job that can be retried if interrupted.
A company runs a web application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application reads data from an Amazon RDS for MySQL database. During peak hours, the database CPU utilization is consistently high, and the application experiences increased latency. The SysOps administrator observes that 90% of database queries are read-only. Which combination of actions will both improve performance and optimize costs?
Explanation: Option B is correct because implementing a read replica offloads read-heavy (90%) queries from the primary RDS instance, reducing CPU utilization and latency. Modifying the application to route read queries to the replica distributes the workload, improving performance while avoiding costly vertical scaling. This optimizes costs by using a smaller primary instance and paying only for the replica's resources.
+15 more Cost and Performance Optimization questions available
Practice all Cost and Performance Optimization questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Cost and Performance Optimization. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Cost and Performance Optimization questions on the SOA-C02 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Cost and Performance Optimization is tested as part of the AWS Certified SysOps Administrator Associate SOA-C02 blueprint. Practicing with targeted Cost and Performance Optimization questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Cost and Performance Optimization is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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