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Question 332 - SAP-C01 discussion

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A company is using an Amazon CloudFront distribution to distribute both static and dynamic content from a web application running behind an Application Load Balancer. The web application requires user authorization and session tracking for dynamic content. The CloudFront distribution has a single cache behavior configured to forward the Authorization, Host, and User-Agent HTTP whitelist headers and a session cookie to the origin. All other cache behavior settings are set to their default value.

A valid ACM certificate is applied to the CloudFront distribution with a matching CNAME in the distribution settings. The ACM certificate is also applied to the HTTPS listener for the Application Load Balancer. The CloudFront origin protocol policy is set to HTTPS only. Analysis of the cache statistics report shows that the miss rate for this distribution is very high. What can the Solutions Architect do to improve the cache hit rate for this distribution without causing the SSL/TLS handshake between CloudFront and the Application Load Balancer to fail?

A.
Create two cache behaviors for static and dynamic content. Remove the User-Agent and Host HTTP headers from thewhitelist headers section on both of the cache behaviors. Remove the session cookie from the whitelist cookies section andthe Authorization HTTP header from the whitelist headers section for cache behavior configured for static content.
Answers
A.
Create two cache behaviors for static and dynamic content. Remove the User-Agent and Host HTTP headers from thewhitelist headers section on both of the cache behaviors. Remove the session cookie from the whitelist cookies section andthe Authorization HTTP header from the whitelist headers section for cache behavior configured for static content.
B.
Remove the User-Agent and Authorization HTTP headers from the whitelist headers section of the cache behavior. Thenupdate the cache behavior to use presigned cookies for authorization.
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B.
Remove the User-Agent and Authorization HTTP headers from the whitelist headers section of the cache behavior. Thenupdate the cache behavior to use presigned cookies for authorization.
C.
Remove the Host HTTP header from the whitelist headers section and remove the session cookie from the whitelistcookies section for the default cache behavior. Enable automatic object compression and use Lambda@Edge viewerrequest events for user authorization.
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C.
Remove the Host HTTP header from the whitelist headers section and remove the session cookie from the whitelistcookies section for the default cache behavior. Enable automatic object compression and use Lambda@Edge viewerrequest events for user authorization.
D.
Create two cache behaviors for static and dynamic content. Remove the User-Agent HTTP header from the whitelistheaders section on both of the cache behaviors. Remove the session cookie from the whitelist cookies section and theAuthorization HTTP header from the whitelist headers section for cache behavior configured for static content.
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D.
Create two cache behaviors for static and dynamic content. Remove the User-Agent HTTP header from the whitelistheaders section on both of the cache behaviors. Remove the session cookie from the whitelist cookies section and theAuthorization HTTP header from the whitelist headers section for cache behavior configured for static content.
Suggested answer: D

Explanation:

https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/understanding-the-cachekey.html

Removing

the host header will result in failed flow between CloudFront and ALB, because they have same certificate.

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asked 16/09/2024
Jatuchot Siriwongsilp
41 questions
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