Exam AWS Certified Developer Associate All Questions

View all questions & answers for the AWS Certified Developer Associate exam

Exam AWS Certified Developer Associate topic 1 question 286 discussion

Exam question from Amazon's AWS Certified Developer Associate

Question #: 286
Topic #: 1

[All AWS Certified Developer Associate Questions]

An application uses an Amazon CloudFront distribution to deliver static content from Amazon S3 buckets that are set up in multiple AWS Regions around the world. A developer receives reports of problems with latency when cached content is updated.

The developer plans to address this problem by redirecting requests on cache misses to the S3 bucket in the Region that is nearest to the user's country. The developer configures the distribution to cache based on the CloudFront-Viewer-Country request header.

What should the developer do next to redirect requests on cache misses?

A. Create a CloudFront function to redirect requests based on the value of the CloudFront-Viewer-Country header. Associate the CloudFront function with the distribution's origin request event.
B. Create a Lambda@Edge function to redirect requests based on the value of the CloudFront-Viewer-Country header. Associate the Lambda@Edge function with the distribution's origin request event.
C. Create a Lambda@Edge function to redirect requests based on the value of the CloudFront-Viewer-Country header. Associate the Lambda@Edge function with the distribution's viewer request event.
D. Create a CloudFront function to redirect requests based on the value of the CloudFront-Viewer-Country header. Associate the CloudFront function with the distribution's viewer request event.

Show Suggested Answer

Suggested Answer: B 🗳️

by k1kavi1 at Nov. 26, 2022, 1:03 p.m.

Disclaimers:

- ExamTopics website is not related to, affiliated with, endorsed or authorized by Amazon.
- Trademarks, certification & product names are used for reference only and belong to Amazon.

Comments

Submit Cancel

lrom

Highly Voted 2 years, 6 months ago

Selected Answer: D

https://aws.amazon.com/it/blogs/aws/introducing-cloudfront-functions-run-your-code-at-the-edge-with-low-latency-at-any-scale/

upvoted 5 times

...

Ankit1010

Highly Voted 2 years, 3 months ago

B - redirect to origin (s3) on cache miss. https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-cloudfront-trigger-events.html The CloudFront events that can be used to trigger Lambda@Edge functions are the following: Viewer request: The function executes when CloudFront receives a request from a viewer, before it checks to see whether the requested object is in the CloudFront cache. Origin request: The function executes only when CloudFront forwards a request to your origin. When the requested object is in the CloudFront cache, the function doesn't execute.

upvoted 5 times

...

kyoharo

Most Recent 1 year, 7 months ago

Selected Answer: B

B. Create a Lambda@Edge function to redirect requests based on the value of the CloudFront-Viewer-Country header. Associate the Lambda@Edge function with the distribution's origin request event.

upvoted 1 times

...

rushi0611

1 year, 11 months ago

Selected Answer: B

Lambda@Edge with origin request event is correct Cloudfront functions does not support origin request event..

upvoted 2 times

...

rcaliandro

1 year, 11 months ago

Selected Answer: B

B - "Create a Lambda@Edge function to redirect requests based on the value of the CloudFront-Viewer-Country header. Associate the Lambda@Edge function with the distribution's origin request event"

upvoted 2 times

...

Panos1313

2 years ago

I think it s D: CloudFront Functions can be useful to redirect traffic based on simple conditions. For instance, a user could choose to redirect traffic coming from a specific country of origin using the HTTP header CloudFront-Viewer-Country.

upvoted 1 times

...

Phinx

2 years, 4 months ago

Selected Answer: B

I think it's B.

upvoted 2 times

...

by116549

2 years, 5 months ago

also found this thread too: https://stackoverflow.com/questions/48633610/how-do-i-get-cloudfront-viewer-country-to-appear-in-response-headers

upvoted 1 times

...

bindukas

2 years, 6 months ago

Selected Answer: B

B. As explained in response to hamimelon comment

upvoted 4 times

...

hamimelon

2 years, 6 months ago

D. I was debating between A & D because I am not familiar with view/origin request. This link helped. https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-cloudfront-trigger-events.html

upvoted 1 times

bindukas

2 years, 6 months ago

Shouldn't it be A then? Since we only want to execute runction on cache misses, so on origin request?

upvoted 1 times

bindukas

2 years, 6 months ago

So it appears cloudfront function does not support origin request: "Similar to Lambda@Edge, CloudFront Functions runs your code in response to events generated by CloudFront. More specifically, CloudFront Functions can be triggered after CloudFront receives a request from a viewer (viewer request) and before CloudFront forwards the response to the viewer (viewer response). Lambda@Edge can also be triggered before CloudFront forwards the request to the origin (origin request) and after CloudFront receives the response from the origin (origin response). You can use CloudFront Functions and Lambda@Edge together, depending on whether you need to manipulate content before, or after, being cached." In this case it makes more sense to me to use Lambda@Edge, so I choose B answer. Otherwise it will always trigger function without checking cache first

upvoted 4 times

fe2

2 years, 5 months ago

very good explanation

upvoted 1 times

...

k1kavi1

2 years, 6 months ago

Selected Answer: B

Choosing B

upvoted 3 times

...