Topic 1 Question 52

AWS Certified Solutions Architect - Professional

Topic 1 Question 52
A company is running a web application in the AWS Cloud. The application consists of dynamic content that is created on a set of Amazon EC2 instances. The EC2 instances run in an Auto Scaling group that is configured as a target group for an Application Load Balancer (ALB).

The company is using an Amazon CloudFront distribution to distribute the application globally. The CloudFront distribution uses the ALB as an origin. The company uses Amazon Route 53 for DNS and has created an A record of www.example.com for the CloudFront distribution.

A solutions architect must configure the application so that itis highly available and fault tolerant.

Which solution meets these requirements?
- Provision a full, secondary application deployment in a different AWS Region. Update the Route 53 A record to be a failover record. Add both of the CloudFront distributions as values. Create Route 53 health checks.
- Provision an ALB, an Auto Scaling group, and EC2 instances in a different AWS Region. Update the CloudFront distribution, and create a second origin for the new ALCreate an origin group for the two origins. Configure one origin as primary and one origin as secondary.
- Provision an Auto Scaling group and EC2 instances in a different AWS Region. Create a second target for the new Auto Scaling group in the ALB. Set up the failover routing algorithm on the ALB.
- Provision a full, secondary application deployment in a different AWS Region. Create a second CloudFront distribution, and add the new application setup as an origin. Create an AWS Global Accelerator accelerator. Add both of the CloudFront distributions as endpoints.
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- 正解だと思う選択肢: B
  The correct answer is B. Provisioning an ALB, an Auto Scaling group, and EC2 instances in a different AWS region provides redundancy and failover capability for the application. By creating a second origin for the new ALB in the second region, the CloudFront distribution can automatically route traffic to the healthy origin in case of an issue with the primary origin. This ensures that the application remains highly available and fault-tolerant.
  
  Option A is not correct because it uses Route 53 failover records, which can result in increased latency and DNS resolution time for clients. Option C is not correct because it doesn't provide redundancy for the load balancer, which is a critical component of the application. Option D is not correct because it does not provide redundancy for the application in case of an issue with the primary origin in the first region.
  
  👍 8
  masetromain2023/01/14
- For HA, always user second region but its there in all options. Here Cloudfront distribution multiple origin groups is the key point Solution Architects should know of. Configuring 2nd origin as ALB --> EC2 instances target group in another regions setup makes highly available. If Cloudfront detects that response is Http error (fault) code like 4XX,5XX etc, it will failover to secondary origin (ALB of another region) which makes this fault tolerant. Answer is B. https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/high_availability_origin_failover.html
  
  👍 4
  God_Is_Love2023/02/25
- 正解だと思う選択肢: B
  B is correct. C is not correct, because ALB is regional service, so ALB have to be added too.
  
  👍 1
  masssa2023/01/20
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