Topic 1 Question 274

AWS Certified DevOps Engineer - Professional

Topic 1 Question 274
A company has an application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The EC2 instances are in multiple Availability Zones. The application was misconfigured in a single Availability Zone, which caused a partial outage of the application.

A DevOps engineer made changes to ensure that the unhealthy EC2 instances in one Availability Zone do not affect the healthy EC2 instances in the other Availability Zones. The DevOps engineer needs to test the application's failover and shift where the ALB sends traffic. During failover, the ALB must avoid sending traffic to the Availability Zone where the failure has occurred.

Which solution will meet these requirements?
- Turn off cross-zone load balancing on the ALB. Use Amazon Route 53 Application Recovery Controller to start a zonal shift away from the Availability Zone.
- Turn off cross-zone load balancing on the ALB’s target group. Use Amazon Route 53 Application Recovery Controller to start a zonal shift away from the Availability Zone.
- Create an Amazon Route 53 Application Recovery Controller resource set that uses the DNS hostname of the ALB. Start a zonal shift for the resource set away from the Availability Zone.
- Create an Amazon Route 53 Application Recovery Controller resource set that uses the ARN of the ALB’s target group. Create a readiness check that uses the ElbV2TargetGroupsCanServeTraffic rule.
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コメント(9)
- 正解だと思う選択肢: A
  For me the correct answer is A:"Note that the Elastic Load Balancing resources must have cross-zone load balancing turned off to use this capability." https://docs.aws.amazon.com/r53recovery/latest/dg/arc-zonal-shift.html
  
  👍 6
  inturist2024/07/16
- 正解だと思う選択肢: B
  Answer is B You can not turn of cross-zone load balancing on an ALB: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/application-load-balancers.html#cross-zone-load-balancing
  
  You can turn it off at the Target Group: https://aws.amazon.com/about-aws/whats-new/2022/11/application-load-balancers-turning-off-cross-zone-load-balancing-per-target-group/
  
  zonal shift: https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/how-elastic-load-balancing-works.html#cross-zone-load-balancing#:~:text=zonal%20shift
  
  👍 4
  Shenannigan2024/09/13
- 正解だと思う選択肢: A
  Turning off cross-zone load balancing on the ALB ensures that each Availability Zone only handles traffic directed to its own healthy instances, allowing for granular control over traffic distribution. This prevents the ALB from sending traffic to the unhealthy instances across all zones, thereby isolating the problem to the affected zone.
  
  Amazon Route 53 Application Recovery Controller's Zonal Shifts is used to direct traffic away from a specific AZ that experiences a failure, allowing the ALB to reroute requests to healthy AZs automatically.
  
  Amazon Route 53 Application Recovery Controller currently supports the following resources for zonal shift and zonal autoshift:
  
  Network Load Balancers with cross-zone load balancing disabled
  
  Application Load Balancers with cross-zone load balancing disabled https://docs.aws.amazon.com/r53recovery/latest/dg/arc-zonal-shift.resource-types.html
  👍 3
  jamesf2024/07/31
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