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Solutions Architect Cost Optimization & Performance Flashcards

7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Solutions Architect Cost Optimization & Performance flashcards as text

  1. Which CloudFront feature reduces origin costs by serving cached content to users without hitting the origin server?

    Answer: Origin Shield

    CloudFront Origin Shield adds a centralized caching layer that increases cache hit ratios and reduces the number of requests forwarded to the origin.

  2. A solutions architect needs to process millions of small tasks asynchronously at the lowest possible cost. Which compute option is best?

    Answer: AWS Lambda

    AWS Lambda charges only for actual compute time in millisecond increments with no idle costs, making it ideal for infrequent or short-duration tasks.

  3. Which DynamoDB capacity mode eliminates the need to provision throughput and is cost-effective for unpredictable traffic?

    Answer: On-Demand mode

    DynamoDB On-Demand mode charges per request and automatically handles any traffic level without capacity planning.

  4. An application stores large media files in S3. Users frequently request the same files from multiple regions. What reduces both latency and data transfer costs?

    Answer: Amazon CloudFront distribution

    CloudFront caches content at edge locations globally, reducing repeated origin fetches and lowering both latency and data transfer out costs from S3.

  5. Which EC2 pricing model is best for a steady-state 24/7 production database that must run for 3 years?

    Answer: 3-year Reserved Instances (All Upfront)

    3-year All Upfront Reserved Instances provide the maximum discount (~72%) for predictable, always-on workloads.

  6. A company wants to reduce RDS costs for a dev/test database that is only used 8 hours per day. What is the most cost-effective approach?

    Answer: Stop the RDS instance when not in use

    Stopping an RDS instance halts compute charges while retaining storage, saving ~67% for an 8-hour/day database compared to running 24/7.

  7. Which AWS service helps identify idle and underutilized EC2 instances to reduce unnecessary spending?

    Answer: AWS Trusted Advisor

    AWS Trusted Advisor's cost optimization checks identify low-utilization EC2 instances based on CPU and network usage over a 14-day period.