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AWS SAA-C03 · Question 64 · Domain 4.4: Network Cost Optimization
A company hosts a popular public website on Amazon EC2 instances behind an Application Load Balancer (ALB). The website serves a large amount of static media files (images and videos). The company's AWS bill shows high 'Data Transfer Out to Internet' costs. What is the MOST cost-effective way to reduce these data transfer costs?
A company hosts a popular public website on Amazon EC2 instances behind an Application Load Balancer (ALB). The website serves a large amount of static media files (images and videos). The company's AWS bill shows high 'Data Transfer Out to Internet' costs. What is the MOST cost-effective way to reduce these data transfer costs?
Answer options:
A.
Move the static media files to Amazon S3 and serve them directly from S3.
B.
Implement Amazon CloudFront and configure the ALB as the origin.
C.
Enable compression on the Application Load Balancer.
D.
Use AWS Global Accelerator to route the traffic.
How to approach this question
To reduce Data Transfer Out costs for web traffic, use CloudFront.
Full Answer
B.Implement Amazon CloudFront and configure the ALB as the origin.✓ Correct
Implement Amazon CloudFront and configure the ALB as the origin.
Amazon CloudFront is a Content Delivery Network (CDN). By caching static assets at edge locations, you reduce the load on your EC2 instances. More importantly for cost, data transfer from AWS origins (like EC2, ALB, or S3) to CloudFront is free, and CloudFront's data transfer out to the internet pricing is often lower than EC2's.
Common mistakes
Thinking moving to S3 solves the *data transfer* cost. S3 solves *storage* cost, but CloudFront solves *data transfer* cost.
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