A training company stores its video files in an S3 bucket in one Region. Learners in Australia and Brazil report several seconds of delay before playback starts, while learners near the Region are happy. Every learner watches the same files. What is the standard fix?
AWS Certified Cloud Practitioner (CLF-C02), objective 3. Cloud technology and services medium
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The options
Correct Serve the videos through Amazon CloudFront
Correct. CloudFront caches the files at edge locations close to viewers, so the second and subsequent requests in a city are served from that city rather than from across an ocean. Identical content for everyone is the ideal case for a cache.
Not correct Copy the bucket into several Regions and tell each learner which URL to use
Wrong in practice. It can be made to work, but you have taken on the replication, the storage bill in every Region and the job of routing each learner to the right copy — all of which the content delivery network does for you.
Not correct Move the bucket to a Region closer to Australia
Wrong. This trades one unhappy group for another. Moving the origin cannot make one location close to every continent.
Not correct Deploy the workload into an AWS Local Zone near each city
Wrong tool. Local Zones place compute and storage close to a specific metropolitan area for latency-sensitive applications, which is a real answer to a different question. For serving the same static files worldwide, the edge cache is both simpler and far more widely distributed.
Why
The global infrastructure has three tiers worth separating in your head. Regions hold your resources. Availability Zones are the fault-isolated facilities inside a Region. Edge locations are a much larger, much thinner tier used for caching (CloudFront), DNS (Route 53) and traffic entry (Global Accelerator) — you do not launch EC2 instances there. Latency for repeatable content is an edge problem; latency for a whole application in one metro is what Local Zones exist for.
Where this comes from
- Cited
- AWS exam guide task statement 3.2
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