DOP-C02 practice question 7 of 35

A company has an application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB) The EC2 Instances are in multiple…

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?

Answer options

A: 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

B: 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 Correct answer

C: 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

D: 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

Correct Answer:

B. 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

Explanation

Turn off cross-zone load balancing on the ALB's target group: Cross-zone load balancing distributes traffic evenly across all registered targets in all enabled Availability Zones. Turning this off will ensure that each target group only handles requests from its respective Availability Zone. To disable cross-zone load balancing: Go to the Amazon EC2 console. Navigate to Load Balancers and select the ALB. Choose the Target Groups tab, select the target group, and then select the Group details tab. Click on Edit and turn off Cross-zone load balancing. Use Amazon Route 53 Application Recovery Controller to start a zonal shift away from the Availability Zone: Amazon Route 53 Application Recovery Controller provides the ability to control traffic flow to ensure high availability and disaster recovery. By using Route 53 Application Recovery Controller, you can perform a zonal shift to redirect traffic away from the unhealthy Availability Zone. To start a zonal shift: Configure Route 53 Application Recovery Controller by creating a cluster and control panel. Create routing controls to manage traffic shifts between Availability Zones. Use the routing control to shift traffic away from the affected Availability Zone.
Reference: Disabling cross-zone load balancing Route 53 Application Recovery Controller

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