ANS-C01 Question 22
Select 3A company has deployed a web application globally using Amazon CloudFront as the content distribution network (CDN). The origin is configured with an Application Load Balancer (ALB) in a single AWS Region. The company wants to improve availability and latency for global customers by integrating the deployment with additional services. Which combination of solutions will meet these requirements?
- A
Use Amazon Route 53 latency-based routing to direct traffic to multiple AWS Regions, each with its own ALB and CloudFront distribution.
- B
Configure Amazon API Gateway with regional endpoints in multiple AWS Regions and use CloudFront to cache responses from the API Gateway endpoints.
- C
Enable CloudFront Origin Shield in the Region closest to most users to reduce origin fetches and improve latency.
- D
Add a second ALB in a different Region and configure CloudFront to use both ALBs as origins with origin failover.
- E
Configure Route 53 with geolocation-based routing to send users to the closest CloudFront edge locations.
Show answer and explanation
Correct answers: A, B, D
Explanation
To improve availability and latency for global customers, a multi-Region architecture is needed. Amazon Route 53 latency-based routing can direct traffic to multiple AWS Regions, each hosting an ALB and CloudFront distribution. Amazon API Gateway with regional endpoints integrated with CloudFront enhances caching and decentralized traffic control. Adding origin failover between ALBs in different Regions ensures high availability. While Origin Shield optimizes origin fetches, it does not directly improve global availability. Similarly, Route 53 geolocation routing does not influence how CloudFront selects edge locations.
- A. Correct.
Correct: Using Amazon Route 53 latency-based routing to direct traffic to multiple ALBs in different AWS Regions improves global availability and latency. Each Region can have its own CloudFront distribution.
- B. Correct.
Correct: Configuring Amazon API Gateway with regional endpoints and using CloudFront to cache responses improves availability and latency by decentralizing traffic and leveraging CloudFront's caching capabilities.
- C. Incorrect.
Incorrect: CloudFront Origin Shield improves performance by reducing fetches from the origin, but it does not address global availability or latency for multiple Regions.
- D. Correct.
Correct: Adding a second ALB in a different Region and configuring CloudFront with origin failover improves availability by ensuring requests can fail over to a healthy origin in another Region.
- E. Incorrect.
Incorrect: Route 53 geolocation-based routing determines user location but cannot direct traffic to the closest CloudFront edge locations, as edge location selection is managed automatically by CloudFront.