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The AWS Certified DevOps Engineer - Professional (DOP-C01) exam is designed for individuals who possess extensive knowledge and experience in operating, provisioning and managing distributed application systems on the AWS platform. AWS Certified DevOps Engineer - Professional certification validates the skills and expertise required to design, deploy, operate and manage highly available, scalable and fault-tolerant systems on the AWS cloud platform. The DOP-C01 exam is intended for experienced DevOps professionals who have a deep understanding of DevOps methodologies, practices and tools, as well as hands-on experience deploying and managing AWS services.

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q430-Q435):

NEW QUESTION # 430
Your company has developed a web application and is hosting it in an Amazon S3 bucket configured for static website hosting.
The application is using the AWS SDK for JavaScript in the browser to access data stored in an Amazon DynamoDB table.
How can you ensure that API keys for access to your data in DynamoDB are kept secure?

A. Configure S3 bucket tags with your AWS access keys for your bucket hosing your website so that the application can query them for access.
B. Store AWS keys in global variables within your application and configure the application to use these credentials when making requests.
C. Configure a web identity federation role within IAM to enable access to the correct DynamoDB resources and retrieve temporary credentials.
D. Create an Amazon S3 role in IAM with access to the specific DynamoDB tables, and assign it to the bucket hosting your website.

Answer: C

NEW QUESTION # 431
You have the following application to be setup in AWS
1) A web tier hosted on EC2 Instances
2) Session data to be written to DynamoDB
3) Log files to be written to Microsoft SQL Server
How can you allow an application to write data to a DynamoDB table?

A. Create an 1AM role that allows read access to the DynamoDB table.
B. Create an 1AM role that allows write access to the DynamoDB table.
C. Add an 1AM user to a running EC2 instance.
D. Add an 1AM user that allows write access to the DynamoDB table.

Answer: B

Explanation:
Explanation
I AM roles are designed so that your applications can securely make API requests from your instances, without requiring you to manage the security credentials that the applications use. Instead of creating and distributing your AWS credentials For more information on 1AM Roles please refer to the below link:
* http://docs.aws.amazon.com/AWSCC2/latest/UserGuide/iam-roles-for-amazon-ec2.html

NEW QUESTION # 432
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. 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.
B. 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.
C. 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.
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: B

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

NEW QUESTION # 433
To run an application, a DevOps Engineer launches an Amazon EC2 instances with public IP addresses in a public subnet. A user data script obtains the application artifacts and installs them on the instances upon launch. A change to the security classification of the application now requires the instances to run with no access to the Internet. While the instances launch successfully and show as healthy, the application does not seem to be installed.
Which of the following should successfully install the application while complying with the new rule?

A. Launch the instances in a public subnet with Elastic IP addresses attached. Once the application is installed and running, run a script to disassociate the Elastic IP addresses afterwards.
B. Create a security group for the application instances and whitelist only outbound traffic to the artifact repository. Remove the security group rule once the install is complete.
C. Set up a NAT gateway. Deploy the EC2 instances to a private subnet. Update the private subnet's route table to use the NAT gateway as the default route.
D. Publish the application artifacts to an Amazon S3 bucket and create a VPC endpoint for S3.
Assign an IAM instance profile to the EC2 instances so they can read the application artifacts from the S3 bucket.

Answer: D

Explanation:
EC2 instances running in private subnets of a VPC can now have controlled access to S3 buckets, objects, and API functions that are in the same region as the VPC. You can use an S3 bucket policy to indicate which VPCs and which VPC Endpoints have access to your S3 buckets
https://aws.amazon.com/pt/blogs/aws/new-vpc-endpoint-for-amazon-s3/

NEW QUESTION # 434
You run a clustered NoSQL database on AWS EC2 using AWS EBS. You need to reduce latency for database response times. Performance is the most important concern, not availability. You did not perform the initial setup, someone without much AWS knowledge did, so you are not sure if they configured everything optimally. Which of the following is NOT likely to be an issue contributing to increased latency?

A. The database is not running in a placement group.
B. The EC2 instances are not EBS Optimized.
C. The EBS Volumes are not using PIOPS.
D. The database and requesting system are both in the wrong Availability Zone.

Answer: D

Explanation:
For the highest possible performance, all instances in a clustered database like this one should be in a single Availability Zone in a placement group, using EBS optimized instances, and using PIOPS SSD EBS Volumes. The particular Availability Zone the system is running in should not be important, as long as it is the same as the requesting resources.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html

NEW QUESTION # 435
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