AWS Solutions Architect Cost Optimization & Performance 3

Question 1

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

Accepted Answer

Origin Shield

Answer

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

Question 2

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

Accepted Answer

AWS Lambda

Answer

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

Question 3

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

Accepted Answer

On-Demand mode

Answer

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

Question 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?

Accepted Answer

Amazon CloudFront distribution

Answer

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

Question 5

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

Accepted Answer

3-year Reserved Instances (All Upfront)

Answer

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

AWS Practice Test

AWS Practice Test

AWS Solutions Architect Cost Optimization & Performance 3