Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 18 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02

Question #: 18
Topic #: 1

[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A solutions architect is designing a solution to access a catalog of images and provide users with the ability to submit requests to customize images. Image customization parameters will be in any request sent to an AWS API Gateway API. The customized image will be generated on demand, and users will receive a link they can click to view or download their customized image. The solution must be highly available for viewing and customizing images.
What is the MOST cost-effective solution to meet these requirements?

A. Use Amazon EC2 instances to manipulate the original image into the requested customizations. Store the original and manipulated images in Amazon S3. Configure an Elastic Load Balancer in front of the EC2 instances.
B. Use AWS Lambda to manipulate the original image to the requested customizations. Store the original and manipulated images in Amazon S3. Configure an Amazon CloudFront distribution with the S3 bucket as the origin.
C. Use AWS Lambda to manipulate the original image to the requested customizations. Store the original images in Amazon S3 and the manipulated images in Amazon DynamoDB. Configure an Elastic Load Balancer in front of the Amazon EC2 instances.
D. Use Amazon EC2 instances to manipulate the original image into the requested customizations. Store the original images in Amazon S3 and the manipulated images in Amazon DynamoDB. Configure an Amazon CloudFront distribution with the S3 bucket as the origin.

Show Suggested Answer

Suggested Answer: B 🗳️
AWS Lambda is a compute service that lets you run code without provisioning or managing servers. AWS Lambda executes your code only when needed and scales automatically, from a few requests per day to thousands per second. You pay only for the compute time you consume ג€" there is no charge when your code is not running. With AWS Lambda, you can run code for virtually any type of application or backend service ג€" all with zero administration. AWS Lambda runs your code on a high-availability compute infrastructure and performs all of the administration of the compute resources, including server and operating system maintenance, capacity provisioning and automatic scaling, code monitoring and logging. All you need to do is supply your code in one of the languages that AWS
Lambda supports.
Storing your static content with S3 provides a lot of advantages. But to help optimize your application's performance and security while effectively managing cost, we recommend that you also set up Amazon CloudFront to work with your S3 bucket to serve and protect the content. CloudFront is a content delivery network
(CDN) service that delivers static and dynamic web content, video streams, and APIs around the world, securely and at scale. By design, delivering data out of
CloudFront can be more cost effective than delivering it from S3 directly to your users.
CloudFront serves content through a worldwide network of data centers called Edge Locations. Using edge servers to cache and serve content improves performance by providing content closer to where viewers are located. CloudFront has edge servers in locations all around the world.
Reference:
https://docs.aws.amazon.com/lambda/latest/dg/welcome.html
https://aws.amazon.com/blogs/networking-and-content-delivery/amazon-s3-amazon-cloudfront-a-match-made-in-the-cloud/

by DK2 at June 3, 2020, 9:13 p.m.

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JohnnyS20

Highly Voted 3 years, 8 months ago

ELIMINATING THE ANSWERS So the important parts in the question is: - there's a need for a service which can do image the manipulation - original and processe dimage should be stored somewhere - solution must be highly-available and cost-effective When we see cost-effective, this would immediately rule out any option that has EC2 instances as instances incur much higher cost. So rule out A and D, which leaves us with B and C. Now if you'll read closely, option C has an EC2 instance and an ELB as well, which makes it more pricey. So this option can be eliminated too. Now to verify if option does solve the requirement: Lambda can do the manipulation. It is also cost-effective as you only pay when your function is running. It also scales well as demand increases/decreases. Both the original and processed images can be stored in S3, but in different buckets. This is a highly-available service and also scalable. CloudFront makes it easy to deliver the images to the user through the use of it's multiple Edge locations. Correct answer: B

upvoted 96 times

gargaditya

3 years, 7 months ago

+Dynamo DB has limitation of 400 KB per item(row).Another reason to elimate Dynamo DB. I dint understand why CLoudfront though, caching will not help as these are customised images?

upvoted 3 times

gargaditya

3 years, 7 months ago

Ok, using it as origin to distribute as there are no EC2s/LB.

upvoted 1 times

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DK2

Highly Voted 3 years, 9 months ago

B looks right. C has option of storing images in DynamoDB which doesn't make any sense. Since it is an demand process, lambda fits better.

upvoted 57 times

3 years, 8 months ago

Lambda seems fine, as it really means pay per use. However, is CF really needed? Most images (original and customized) will be new/unique, so cache will hardly be used.

upvoted 2 times