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AWS Certified DevOps Engineer - Professional Questions and Answers

Question 37

A company wants to automatically re-create its infrastructure using AWS CloudFormation as part of the company's quality assurance (QA) pipeline. For each QA run, a new VPC must be created in a single account, resources must be deployed into the VPC, and tests must be run against this new infrastructure. The company policy states that all VPCs must be peered with a central management VPC to allow centralized logging. The company has existing CloudFormation templates to deploy its VPC and associated resources.

Which combination of steps will achieve the goal in a way that is automated and repeatable? (Choose two.)

Options:

Create an AWS Lambda function that is invoked by an Amazon CloudWatch Events rule when a CreateVpcPeeringConnection API call is made. The Lambda function should check the source of the peering request, accepts the request, and update the route tables for the management VPC to allow traffic to go over the peering connection.

In the CloudFormation template:Invoke a custom resource to generate unique VPC CIDR ranges for the VPC and subnets.Create a peering connection to the management VPC.Update route tables to allow traffic to the management VPC.

In the CloudFormation template:Use the Fn::Cidr function to allocate an unused CIDR range for the VPC and subnets.Create a peering connection to the management VPC.Update route tables to allow traffic to the management VPC.

Modify the CloudFormation template to include a mappings object that includes a list of /16 CIDR ranges for each account where the stack will be deployed.

Use CloudFormation StackSets to deploy the VPC and associated resources to multiple AWS accounts using a custom resource to allocate unique CIDR ranges. Create peering connections from each VPC to the central management VPC and accept those connections in the management VPC.

Question 38

A DevOps engineer is troubleshooting deployments to a new application that runs on Amazon EC2 instances behind an Application Load Balancer. The instances run in an EC2 Auto Scaling group across multiple Availability Zones. Instances sometimes come online before they are ready, which is leading to increased error rates among users. The current health check configuration gives instances a 60-second grace period and considers instances healthy after two 200 response codes from /index.php, a page that may respond intermittently during the deployment process. The development team wants instances to come online as soon as possible.

Which strategy would address this issue?

Options:

Increase the instance grace period from 60 seconds to 180 seconds, and the consecutive health check requirement from 2 to 3.

Increase the instance grace period from 60 seconds to 120 seconds, and change the response code requirement from 200 to 204.

Modify the deployment script to create a /health-check.php file when the deployment begins, then modify the health check path to point to that file.

Modify the deployment script to create a /health-check.php file when all tasks are complete, then modify the health check path to point to that file.

Question 39

A company updated the AWS CloudFormation template tor a critical business application. The stack update process Tailed due to an error in me updated template, and CloudFormation automatically began the stack rollback process Later, a DevOps engineer found the application was still unavailable, and that the stack was in the UPDATE_ROLLBACK_FALED state

Which combination of actions will allow the stack rollback to complete successful/? (Select TWO)

Options:

Attach the AWSCloudFormationFulAccess IAM policy to the CloudFormation role

Automatically heal the stack resources using CloudFormation drift detection.

Issue a ContinueUpdateRolback command from the CloudFormation console or AWS CLI

Manually the resources to match the expectations of the stack.

Update the existing CloudFormation stack using the original template

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AWS Certified DevOps Engineer - Professional Questions and Answers

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