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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q551-Q556):

NEW QUESTION # 551
A company has a mission-critical application on AWS that uses automatic scaling. The company wants the deployment lifecycle to meet the following parameters
*The application must be deployed one instance at a time to ensure the remaining fleet continues to serve traffic.
*the application is CPU intensive and must ho closely monitored
*the deployment must automatically roll back if the CPU utilization of the deployment instance exceeds 85% Which solution will meet these requirements'?

A. Use AWS CodeDeploy with Amazon EC2 Auto Scaling Configure an alarm tied to the CPU utilization metric Use the CodeDeployDefault OneAtAtime configuration as a deployment strategy Configure automatic rollbacks within the deployment group to roll back the deployment if the alarm thresholds are breached
B. Use AWS Elastic Beanstalk for load balancing and AWS Auto Scaling Configure an alarm tied to the CPU utilization metric Configure rolling deployments with a fixed batch size of one instance Enable enhanced health to monitor the status of the deployment and roll back based on the alarm previously created
C. Use AWS Systems Manager to perform a blue/green deployment with Amazon EC2 Auto Scaling Configure an alarm tied to the CPU utilization metric Deploy updates one at a time Configure automatic rollbacks within the Auto Scaling group to roll back the deployment if the alarm thresholds are breached.
D. Use AWS CloudForrnation to create an AWS Step Functions state machine and Auto Scaling lifecycle hooks to move to one instance at a time into a wait state. Use AWS Systems Manager automation to deploy the update to each instance and move it back into the Auto Scaling group using the heartbeat timeout

Answer: A

NEW QUESTION # 552
What is a circular dependency in AWS CloudFormation?

A. When a Template references a region, which references the original Template.
B. When Nested Stacks depend on each other.
C. When a Template references an earlier version of itself.
D. When Resources form a DependOn loop.

Answer: D

Explanation:
To resolve a dependency error, add a DependsOn attribute to resources that depend on other resources
in your template. In some cases, you must explicitly declare dependencies so that AWS CloudFormation
can create or delete resources in the correct order. For example, if you create an Elastic IP and a VPC
with an Internet gateway in the same stack, the Elastic IP must depend on the Internet gateway
attachment. For additional information, see DependsOn Attribute.
Reference:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/troubleshooting.html#troubleshootin
g-errors-dependence-error

NEW QUESTION # 553
A company has microservices running in AWS Lambda that read data from Amazon DynamoDB. The Lambda code is manually deployed by Developers after successful testing. The company now needs the tests and deployments be automated and run in the cloud. Additionally, traffic to the new versions of each microservice should be incrementally shifted over time after deployment.
What solution meets all the requirements, ensuring the MOST developer velocity?

A. Create an AWS CodeBuild configuration that triggers when the test code is pushed. Use AWS CloudFormation to trigger an AWS CodePipeline configuration that deploys the new Lambda versions and specifies the traffic shift percentage and interval.
B. Create an AWS CodePipeline configuration and set up the source code step to trigger when code is pushed. Set up the build step to use AWS CodeBuild to run the tests. Set up an AWS CodeDeploy configuration to deploy, then select the CodeDeployDefault.LambdaLinear10PercentEvery3Minutes option.
C. Create an AWS CodePipeline configuration and set up a post-commit hook to trigger the pipeline after tests have passed. Use AWS CodeDeploy and create a Canary deployment configuration that specifies the percentage of traffic and interval.
D. Use the AWS CLI to set up a post-commit hook that uploads the code to an Amazon S3 bucket after tests have passed. Set up an S3 event trigger that runs a Lambda function that deploys the new version.
Use an interval in the Lambda function to deploy the code over time at the required percentage.

Answer: B

Explanation:
Explanation
https://docs.aws.amazon.com/codedeploy/latest/userguide/deployment-configurations.html

NEW QUESTION # 554
You are responsible for an application that leverages the Amazon SDK and Amazon EC2 roles for storing and retrieving data from Amazon S3, accessing multiple DynamoDB tables, and exchanging message with Amazon SQS queues. Your VP of Compliance is concerned that you are not following security best practices for securing all of this access. He has asked you to verify that the application's AWS access keys are not older than six months and to provide control evidence that these keys will be rotated a minimum of once every six months.
Which option will provide your VP with the requested information?

A. Createa new set of instructions for your configuration management tool that willperiodically create and rotate the application's existing access keys andprovide a compliance report to your VP.
B. Provideyour VP with a link to 1AM AWS documentation to address the VP's key rotationconcerns.
C. Updateyour application to log changes to its AWS access key credential file and use aperiodic Amazon EMR job to create a compliance report for your VP
D. Createa script to query the 1AM list-access keys API to get your application accesskey creation date and create a batch process to periodically create acompliance report for your VP.

Answer: B

Explanation:
Explanation
The question is focusing on 1AM roles rather than using access keys for accessing the services, AWS will take care of the temporary credentials provided through the roles in accessing these services.

NEW QUESTION # 555
A healthcare company has a critical application running in AWS. Recently, the company experienced some down time. if it happens again, the company needs to be able to recover its application in another AWS Region. The application uses Elastic Load Balancing and Amazon EC2 instances. The company also maintains a custom AMI that contains its application. This AMI is changed frequently. The workload is required to run in the primary region, unless there is a regional service disruption, in which case traffic should fail over to the new region. Additionally, the cost for the second region needs to be low.
The RTO is 2 hours.
Which solution allows the company to fail over to another region in the event of a failure, and also meet the above requirements?

A. Automate the copying of the AMI in the main region to the backup region. Generate an AWS Lambda function that will create an EC2 instance from the AMI and place it behind a load balancer. Using the same Lambda function, point the Amazon Route 53 record to the load balancer in the backup region.
Trigger the Lambda function in the event of a failure.
B. Place the AMI in a replicated Amazon S3 bucket. Generate an AWS Lambda function that can create a launch configuration and assign it to an already created Auto Scaling group. Have one instance in this Auto Scaling group ready to accept traffic. Trigger the Lambda function in the event of a failure. Use an Amazon Route 53 record and modify it with the same Lambda function to point to the load balancer in the backup region.
C. Automate the copying of the AMI to the backup region. Create an AWS Lambda function that can create a launch configuration and assign it to an already created Auto Scaling group. Set the Auto Scaling group maximum size to 0 and only increase it with the Lambda function during a failure.
Trigger the Lambda function in the event of a failure. Use an Amazon Route 53 record and modify it with the same Lambda function to point to the load balancer in the backup region.
D. Maintain a copy of the AMI from the main region in the backup region. Create an Auto Scaling group with one instance using a launch configuration that contains the copied AMI. Use an Amazon Route 53 record to direct traffic to the load balancer in the backup region in the event of failure, as required.
Allow the Auto Scaling group to scale out as needed during a failure.

Answer: C

Explanation:
B is not the best answer. It will create an instance in the backup region which will have cost. We should keep the cost low by not starting up the instance unless failover.

NEW QUESTION # 556
......

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