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The AWS-DevOps exam requires the candidates to have a strong understanding of AWS services, such as Amazon EC2, Amazon S3, and Amazon RDS, and how to use them to build, deploy, and manage applications. DOP-C01 Exam also assesses the candidates’ ability to design and implement complex, multi-tier, and distributed systems on the AWS platform. Additionally, the exam evaluates the candidate’s knowledge of security best practices and how to apply them in the DevOps environment. Overall, the AWS-DevOps certification is ideal for professionals who want to demonstrate their expertise in DevOps and AWS and advance their careers in these fields.

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q172-Q177):

NEW QUESTION # 172
A company runs an application with an Amazon EC2 and on-premises configuration. A DevOps Engineer needs to standardize patching across both environments. Company policy dictates that patching only happens during non-business hours.
Which combination of actions will meet these requirements? (Choose three.)

A. Use AWS Systems Manager Maintenance Windows to schedule a patch window.
B. Execute an AWS Systems Manager Automation document to patch the systems every hour.
C. Add the physical machines into AWS Systems Manager using Systems Manager Hybrid Activations.
D. Use Amazon CloudWatch Events scheduled events to schedule a patch window.
E. Attach an IAM role to the EC2 instances, allowing them to be managed by AWS Systems Manager.
F. Create IAM access keys for the on-premises machines to interact with AWS Systems Manager.

Answer: A,C,E

Explanation:
https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager- managedinstances.htm

NEW QUESTION # 173
You want to securely distribute credentials for your Amazon RDS instance to your fleet of web server instances.
The credentials are stored in a file that is controlled by a configuration management system.
How do you securely deploy the credentials in an automated manner across the fleet of web server instances, which can number in the hundreds, while retaining the ability to roll back if needed?

A. Insert credential files into user data and use an instance lifecycle policy to periodically refresh the file from the user data.
B. Store the credential files in your version-controlled repository with the rest of your code.
Use a parallel file copy program to send the credential files from your local machine to the Amazon EC2 instances.
C. Keep credential files as a binary blob in an Amazon RDS MySQL DB instance, and have a script on each Amazon EC2 instance that pulls the files down from the RDS instance.
D. Store your credential files in an Amazon S3 bucket.
Use Amazon S3 server-side encryption on the credential files.
Have a scheduled job that pulls down the credential files into the instances every 10 minutes.
E. Store the credential files in your version-controlled repository with the rest of your code.
Have a post-commit action in version control that kicks off a job in your continuous integration system which securely copses the new credential files to all web server instances.

Answer: D

NEW QUESTION # 174
A DevOps Engineer wants to prevent Developers from pushing updates directly to the company's master branch in AWS CodeCommit. These updates should be approved before they are merged.
Which solution will meet these requirements?

A. Configure an IAM role for the Developers to use feature branches and create a pull request when a feature is complete. Allow CodeCommit to test all code in the feature branches, and dynamically modify the IAM role to allow merging the feature branches into the master. Allow an approver to use CodeCommit to view the changes and approve the pull requests.
B. Configure an IAM role for the Developers with access to CodeCommit and attach an access policy to the CodeCommit repository that denies the Developers role access when the reference is master.
Allow Developers to use feature branches and create a pull request when a feature is complete.
Allow an approver to use CodeCommit to view the changes and approve the pull requests.
C. Configure an IAM role for the Developers with access to CodeCommit and an explicit deny for write actions when the reference is the master. Allow Developers to use feature branches and create a pull request when a feature is complete. Allow an approver to use CodeCommit to view the changes and approve the pull requests.
D. Configure an IAM role for the Developers to use feature branches and create a pull request when a feature is complete. Allow CodeCommit to test all code in the feature branches, and issue a new AWS Security Token Service (STS) token allowing a one-time API call to merge the feature branches into the master. Allow an approver to use CodeCommit to view the changes and approve the pull requests.

Answer: B

NEW QUESTION # 175
Your company currently runs a large multi-tier web application. One component is an API service that all other components of your application rely on to perform read/write operations.
This service must have high availability and zero downtime during deployments.
Which technique should you use to provide cost-effective, zero-downtime deployments for this component?

A. Use an AWS CloudFormation template to re-deploy your application behind a load balancer, and launch a new AWS CloudFormation stack during each deployment.
Update your load balancer to send traffic to the new stack, and then deploy your software. Leave your old stacks running, and tag their resources with the version for rollback.
B. Re-deploy your application on Elastic Beanstalk. During deployment, create a new version of your application, and create a new environment running that version in Elastic BeanStalk. Finally, take advantage of the Elastic Beanstalk Swap CNAME operation to switch to the new environment.
C. Re-deploy your application behind a load balancer that uses Auto Scaling groups. Create a new identical Auto Scaling group and associate it to your Amazon Route53 zone.
Configure Amazon Route53 to auto- weight traffic over to the new Auto Scaling group when all instances are marked as healthy.
D. Re-deploy your application behind a load balancer using an AWS OpsWorks stack and use AWS OpsWorks stack versioning, during deployment create a new version of your application, tell AWS OpsWorks to launch the new version behind your load balancer, and when the new version is launched, terminate the old AWS OpsWorks stack.

Answer: B

NEW QUESTION # 176
You are in charge of designing a Cloudformation template which deploys a LAMP stack. After deploying a stack, you see that the status of the stack is showing as CREATE_COMPLETE, but the apache server is still not up and running and is experiencing issues while starting up. You want to ensure that the stack creation only shows the status of CREATE_COMPLETE after all resources defined in the stack are up and running.
How can you achieve this?
Choose 2 answers from the options given below.

A. Definea stack policy which defines that all underlying resources should be up andrunning before showing a status of CREATE_COMPLETE.
B. Usethe CreationPolicy to ensure it is associated with the EC2 Instance resource.
C. Usethe CFN helper scripts to signal once the resource configuration is complete.
D. Uselifecycle hooks to mark the completion of the creation and configuration of theunderlying resource.

Answer: B,C

Explanation:
Explanation
The AWS Documentation mentions
When you provision an Amazon EC2 instance in an AWS Cloud Formation stack, you might specify additional actions to configure the instance, such as install software packages or bootstrap applications.
Normally, CloudFormation proceeds with stack creation after the instance has been successfully created.
However, you can use a Creation Pol icy so that CloudFormation proceeds with stack creation only after your configuration actions are done. That way you'll know your applications are ready to go after stack creation succeeds.
For more information on the Creation Policy, please visit the below url
https://aws.amazon.com/blogs/devops/use-a-creationpolicy-to-wait-for-on-instance-configurations/

NEW QUESTION # 177
......

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