SAP-C03 practice question: Content delivery and replication costs (CloudFront, Origin Shield, CRR)
Cost-Optimized Architecture Design A free question from our original SAP-C03 practice exam. Try it, then open the answer to see why each option is right or wrong.
A car maker publishes high-resolution vehicle images from an Amazon S3 bucket in a single Region. Dealers and owners around the world view them through Amazon CloudFront, and the team sees many cache misses reaching the bucket from edge locations on every continent. Most viewers are in Europe, Asia and North America.
The team wants to cut the origin requests and the cost of the transfers from the bucket, without changing the image URLs or the bucket's Region.
Which change meets these requirements?
Choose one answer.
AA. Remove CloudFront and let viewers download the images directly from the S3 bucket, with S3 Transfer Acceleration turned on for faster downloads in distant countries.
BB. Lower the CloudFront price class so that fewer edge locations serve the images, which reduces the number of misses that reach the bucket.
CC. Copy the bucket to a new bucket in every Region with Cross-Region Replication, and point each viewer's CloudFront origin at the closest copy.
DD. Turn on CloudFront Origin Shield in the Region where the bucket is located, so that edge locations fetch from one shielded cache layer before they go to the bucket.
Show the answer and explanation
Answer: D
A. Wrong: Without CloudFront, every view is served from the bucket, so origin requests and transfer costs rise, and Transfer Acceleration adds its own per-gigabyte charge. The option also changes the image URLs, which the team wants to keep.
B. Wrong: A smaller price class removes edge locations, which raises latency for viewers in the excluded regions. It does not reduce the requests that the edge locations still make to the bucket.
C. Wrong: Replicas in every Region multiply storage and replication charges, and they do not reduce the cache misses that reach the origin. The option also changes the origin the team manages.
D. Right: Correct. Origin Shield adds a central cache layer in the origin's Region, so many edge misses collapse into fewer requests to the bucket. The image URLs and the bucket's Region stay the same.
Explanation
Origin Shield collapses cache misses from many edge locations into one layer in the origin's Region, which cuts origin requests without changing URLs or the bucket. Removing CloudFront, replicating everywhere or cutting the price class each raise cost or latency.
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