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Exam AWS Certified Solutions Architect - Professional topic 1 question 950 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 950
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A company has a multi-tier web application that runs on a fleet of Amazon EC2 instances behind an Application Load Balancer (ALB). The instances are in an Auto Scaling group. The ALB and the Auto Scaling group are replicated in a backup AWS Region. The minimum value and the maximum value for the Auto Scaling group are set to zero. An Amazon RDS Multi-AZ DB instance stores the application's data. The DB instance has a read replica in the backup Region. The application presents an endpoint to end users by using an Amazon Route 53 record.

The company needs to reduce its RTO to less than 15 minutes by giving the application the ability to automatically fail over to the backup Region. The company does not have a large enough budget for an active-active strategy.

What should a solutions architect recommend to meet these requirements?

  • A. Reconfigure the application's Route 53 record with a latency-based routing policy that load balances traffic between the two ALBs. Create an AWS Lambda function in the backup Region to promote the read replica and modify the Auto Scaling group values. Create an Amazon CloudWatch alarm that is based on the HTTPCode_Target_5XX_Count metric for the ALB in the primary Region. Configure the CloudWatch alarm to invoke the Lambda function.
  • B. Create an AWS Lambda function in the backup Region to promote the read replica and modify the Auto Scaling group values. Configure Route 53 with a health check that monitors the web application and sends an Amazon Simple Notification Service (Amazon SNS) notification to the Lambda function when the health check status is unhealthy. Update the application's Route 53 record with a failover policy that routes traffic to the ALB in the backup Region when a health check failure occurs.
  • C. Configure the Auto Scaling group in the backup Region to have the same values as the Auto Scaling group in the primary Region. Reconfigure the application's Route 53 record with a latency-based routing policy that load balances traffic between the two ALBs. Remove the read replica. Replace the read replica with a standalone RDS DB instance. Configure Cross-Region Replication between the RDS DB instances by using snapshots and Amazon S3.
  • D. Configure an endpoint in AWS Global Accelerator with the two ALBs as equal weighted targets. Create an AWS Lambda function in the backup Region to promote the read replica and modify the Auto Scaling group values. Create an Amazon CloudWatch alarm that is based on the HTTPCode_Target_5XX_Count metric for the ALB in the primary Region. Configure the CloudWatch alarm to invoke the Lambda function.
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Suggested Answer: B 🗳️
by SureNot at Nov. 25, 2022, 10:40 p.m.
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Sin_Dan
6 months, 1 week ago
The options provided to this question are literally foolish. You don't need an SNS notification and lambda function to update route 53. Router 53 can do the health checks on its own and failover. You just need one lambda function to promote the read-replica to the backup instance which can't be done automatically in the multi-region setup. In any case, from the options provided, B is the correct one, but whoever was the architect, he definitely didn't clear the SAP-C02 certification. LOL!
upvoted 1 times
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TajSidKazi
2 years, 1 month ago
B This solution recommends creating an AWS Lambda function in the backup region to promote the read replica and modify the Auto Scaling group values, and then configuring Route 53 with a health check that monitors the web application and sends an Amazon SNS notification to the Lambda function when the health check status is unhealthy. Finally, the application's Route 53 record should be updated with a failover policy that routes traffic to the ALB in the backup region when a health check failure occurs. This approach provides automatic failover to the backup region when a health check failure occurs, reducing the RTO to less than 15 minutes. Additionally, this approach is cost-effective as it does not require an active-active strategy.
upvoted 1 times
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syaldram
2 years, 3 months ago
Selected Answer: B
C is definitely in correct. The company does not have the budget!
upvoted 1 times
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Spavanko
2 years, 4 months ago
Selected Answer: B
Why not B: C is incorrect because "The company does not have a large enough budget for an active-active strategy."
upvoted 3 times
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SureNot
2 years, 5 months ago
Selected Answer: B
Standard solution
upvoted 3 times
masetromain
2 years, 4 months ago
why not A is not good?
upvoted 1 times
pixepe
2 years, 4 months ago
It;s NOT A because, It's not Active-Active, Latency based routing is for active-active mainly. We need failover policy. Ref - https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html
upvoted 3 times
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3a632a3
1 year, 3 months ago
You also cannot configure a cross-region alarm. An alarm based on a metric from another region. https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/Cross-Account-Cross-Region.html
upvoted 1 times
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