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The AWS-DevOps certification is an advanced level certification that is designed to validate the skills of experienced DevOps engineers. AWS Certified DevOps Engineer - Professional certification exam is designed to test the candidate’s ability to automate the delivery of applications, infrastructure, and services on the Amazon Web Services platform. AWS Certified DevOps Engineer - Professional certification is intended for professionals who work in organizations that use AWS to develop and deploy applications.

Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q574-Q579):

NEW QUESTION # 574
A company has developed a Node.js web application which provides REST services to store and retrieve time series data. The web application is built by the Development team on company laptops, tested locally, and manually deployed to a single on-premises server, which accesses a local MySQL database. The company is starting a trial in two weeks, during which the application will undergo frequent updates based on customer feedback. The following requirements must be met:
- The team must be able to reliably build, test, and deploy new updates on a daily basis, without downtime or degraded performance.
- The application must be able to scale to meet an unpredictable number of concurrent users during the trial.
Which action will allow the team to quickly meet these objectives?

A. Modify the application to use Amazon DynamoDB instead of a local MySQL database. Use AWS OpsWorks to create a stack for the application with a DynamoDB layer, an Application Load Balancer layer, and an Amazon EC2 instance layer. Use a Chef recipe to build the application and a Chef recipe to deploy the application to the EC2 instance layer. Use custom health checks to run unit tests on each instance with rollback on failure.
B. Develop an AWS CloudFormation template to create an Application Load Balancer and two Amazon EC2 instances with Amazon EBS (SSD) volumes in an Auto Scaling group with rolling updates enabled. Use AWS CodeBuild to build and test the Node.js application and store it in an Amazon S3 bucket. Use user-data scripts to install the application and the MySQL database on each EC2 instance.
Update the stack to deploy new application versions.
C. Configure AWS Elastic Beanstalk to automatically build the application using AWS CodeBuild and to deploy it to a test environment that is configured to support auto scaling. Create a second Elastic Beanstalk environment for production. Use Amazon RDS to store data. When new versions of the applications have passed all tests, use Elastic Beanstalk `swap cname' to promote the test environment to production.
D. Create two Amazon Lightsail virtual private servers for Node.js; one for test and one for production.
Build the Node.js application using existing process and upload it to the new Lightsail test server using the AWS CLI. Test the application, and if it passes all tests, upload it to the production server. During the trial, monitor the production server usage, and if needed, increase performance by upgrading the instance type.

Answer: C

Explanation:
https://docs.aws.amazon.com/codebuild/latest/userguide/sample-elastic-beanstalk.html#sample- elastic-beanstalk-eb-cli

NEW QUESTION # 575
The Development team at an online retailer has moved to Business support and want to take advantage of the AWS Health Dashboard and the AWS Health API to automate remediation actions for issues with the health of AWS resources. The first use case is to respond to AWS detecting an IAM access key that is listed on a public code repository site. The automated response will be to delete the IAM access key and send a notification to the Security team.
How should this be achieved?

A. Use AWS Step Functions to create a function to delete the IAM access key, and then use Amazon SNS to send a notification to the Security team. Create an Amazon CloudWatch Events rule with an aws.health event source and the AWS_RISK_CREDENTIALS_EXPOSED event, set the target of the CloudWatch Events rule to Step Functions.
B. Create an AWS Lambda function to delete the IAM access key. Send AWS CloudTrail logs to AWS CloudWatch logs. Create a CloudWatch Logs metric filter for the AWS_RISK_CREDENTIALS_EXPOSED event with two actions: first, run the Lambda function; second, use Amazon SNS to send a notification to the Security team.
C. Create an AWS Lambda function to delete the IAM access key. Create an AWS Config rule for changes to aws.health and the AWS_RISK_CREDENTIALS_EXPOSED event with two actions: first, run the Lambda function; second, use Amazon SNS to send a notification to the Security team.
D. Use AWS Step Functions to create a function to delete the IAM access key, and then use Amazon SNS to send a notification to the Security team. Create an AWS Personal Health Dashboard rule for the AWS_RISK_CREDENTIALS_EXPOSED event; set the target of the Personal Health Dashboard rule to Step Functions.

Answer: D

NEW QUESTION # 576
You are deciding on a deployment mechanism for your application. Which of the following deployment mechanisms provides the fastest rollback after failure.

A. Canary
B. Rolling-Mutable
C. Blue/Green
D. Rolling-Immutable

Answer: C

Explanation:
Explanation
In Blue Green Deployments, you will always have the previous version of your application available. So anytime there is an issue with a new deployment, you can just quickly switch back to the older version of your application.
For more information on Blue Green Deployments, please refer to the below link:
* https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html

NEW QUESTION # 577
A company has a website in an AWS Elastic Beanstalk load balancing and automatic scaling environment. This environment has an Amazon RDS MySQL instance configured as its database resource. After a sudden increase in traffic, the website started dropping traffic. An administrator discovered that the application on some instances is not responding as the result of out-of-memory errors. Classic Load Balancer marked those instances as out of service, and the health status of Elastic Beanstalk enhanced health reporting is degraded. However, Elastic Beanstalk did not replace those instances. Because of the diminished capacity behind the Classic Load Balancer, the application response times are slower for the customers. Which action will permanently fix this issue?

A. Temporarily change the maximum number of instances in the Auto Scaling group to allow the group to support more traffic.
B. Clone the Elastic Beanstalk environment. When the new environment is up, swap CNAME and terminate the earlier environment.
C. Write a cron script for restraining the web server process when memory is full, and deploy it with AWS Systems Manager.
D. Change the setting for the Auto Scaling group health check from Amazon EC2 to Elastic Load Balancing, and increase the capacity of the group.

Answer: A

NEW QUESTION # 578
For AWS Auto Scaling, what is the first transition state an existing instance enters after leaving Standby state?

A. Pending
B. Terminating:Wait
C. EnteringStandby
D. Detaching

Answer: A

Explanation:
Explanation
The below diagram shows the Lifecycle policy. When the stand-by state is exited, the next state is pending.

For more information on Autoscaling Lifecycle, please refer to the below link:
* http://docs.aws.amazon.com/autoscaling/latest/userguide/AutoScaingGroupLifecycle.html

NEW QUESTION # 579
......

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