Quiz Amazon - AWS-DevOps - AWS Certified DevOps Engineer - Professional Updated Test Questions

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q487-Q492):

NEW QUESTION # 487
You have a web application composed of an Auto Scaling group of web servers behind a load balancer, and create a new AMI for each application version for deployment. You have a new version to release, and you want to use the A/B deployment technique to migrate users over in a controlled manner while the size of the fleet remains constant over a period of 12 hours, to ensure that the new version is performing well.
What option should you choose to enable this technique while being able to roll back easily?

A. Createan Auto Scaling launch configuration with the new AMI. Create an Auto Scalinggroup configured to use the new launch configuration and to register instanceswith the same load balancer. Vary the desired capacity of each group tomigrate.
B. Createa load balancer. Create an Auto Scaling launch configuration with the new AMIto use the new launch configuration and to register instances with the new loadbalancer. Use Amazon Route53 weighted Round Robin to vary the proportion ofrequests sent to the load balancers.
C. Launchnew instances using the new AMI and attach them to the Auto Scalinggroup.Configure Elastic Load Balancing to vary the proportion of requests sent toinstances running the two application versions.
D. Createan Auto scaling launch configuration with the new AMI. Configure Auto Scalingto vary the proportion of instances launched from the two launchconfigurations.
E. Createan Auto scaling launch configuration with the new AMI. Configure the AutoScalinggroup with the new launch configuration. Use the Auto Scaling rollingupdates feature to migrate to the new version.

Answer: B

Explanation:
Explanation
Since you want to control the usage to the new application in a controlled manner, the best way is to use Route53 weighted method. The AWS documentation mentions the following on this method Weighted routing lets you associate multiple resources with a single domain name (example.com) or subdomain name (acme.example.com) and choose how much traffic is routed to each resource. This can be useful for a variety of purposes, including load balancing and testing new versions of software.
For more information on Weighted Round Robin method, please visit the link:
* http://docs