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To become an AWS Certified DevOps Engineer - Professional, candidates must have a minimum of two years of hands-on experience in designing, deploying, and managing AWS solutions using DevOps practices. They should also have experience with at least one high-level programming language, as well as knowledge of AWS services such as EC2, S3, and RDS. DOP-C01 Exam consists of multiple-choice and multiple-response questions and must be taken at an AWS testing center or remotely through a proctored online exam. Upon passing the exam, candidates will receive a certification that is recognized by employers and peers in the industry as a validation of their expertise in AWS DevOps.

Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q310-Q315):

NEW QUESTION # 310
You currently have an Autoscalinggroup that has the following settings
Min capacity-2
Desired capacity - 2
Maximum capacity - 2
Your launch configuration has AMI'S which are based on the t2.micro instance type. The application running on these instances are now experiencing issues and you have identified that the solution is to change the instance type of the instances running in the Autoscaling Group.
Which of the below solutions will meet this demand.

A. Delete the current Launch configuration. Create a new launch configuration with the new instance type and add it to the Autoscaling Group. This will then launch the new instances.
B. Change the desired and maximum size of the Autoscaling Group to 4. Make a copy the Launch configuration. Change the instance type in the new launch configuration. Attach that to the Autoscaling Group. Change the maximum and Desired size of the Autoscaling Group to 2
C. Make a copy the Launch configuration. Change the instance type in the new launch configuration.
Attach that to the Autoscaling Group.
Change the maximum and Desired size of the Autoscaling Group to 4. Once the new instances are launched, change the Desired and maximum size back to 2.
D. Change the Instance type in the current launch configuration. Change the Desired value of the Autoscaling Group to 4. Ensure the new instances are launched.

Answer: C

Explanation:
Explanation
You should make a copy of the launch configuration, add the new instance type. The change the Autoscaling Group to include the new instance type. Then change the Desired number of the Autoscaling Group to 4 so that instances of new instance type can be launched.
Once launched, change the desired size back to 2, so
that Autoscaling will delete the instances with the older configuration. Note that the assumption here is that the current instances are equally distributed across multiple AZ's because Autoscaling will first use the AZRebalance process to terminate instances.
Option A is invalid because you cannot make changes to an existing Launch configuration.
Option B is invalid because if you delete the existing launch configuration, then your application will not be available. You need to ensure a smooth deployment process.
Option D is invalid because you should change the desired size to 4 after attaching the new launch configuration.
For more information on Autoscaling Suspend and Resume, please visit the below URL:
* http://docs.aws.amazon.com/autoscaling/latest/userguide/as-suspend-resume-processes.html

NEW QUESTION # 311
You run operations for a company that processes digital wallet payments at a very high volume. One second of downtime, during which you drop payments or are otherwise unavailable, loses you on average USD 100. You balance the financials of the transaction system once per day.
Which database setup is best suited to address this business risk?

A. A multi-region, multi-master, active-active RDS configuration using database-level ACID design principles with database trigger writes for replication.
B. A multi-AZ RDS deployment with synchronous replication to multiple standbys and read-replicas for fast failover and ACID properties.
C. A multi-region, multi-master, active-active DynamoDB configuration using application control-level BASE design principles with change-stream write queue buffers for replication.
D. A multi-AZ DynamoDB setup with changes streamed to S3 via AWS Kinesis, for highly durable storage and BASE properties.

Answer: C

Explanation:
Only the multi-master, multi-region DynamoDB answer makes sense. Multi-AZ deployments do not provide sufficient availability when a business loses USD 360,000 per hour of unavailability. As RDS does not natively support multi-region, and ACID does not perform well/at all over large distances between regions, only the DynamoDB answer works.
Reference: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ Streams.CrossRegionRepl.html

NEW QUESTION # 312
As CloudTrail sends a notification each time a log file is written to the Amazon S3 bucket, an account that's very active can generate a large number of notifications. If you subscribe using email or SMS, you may end up receiving a large volume of messages. Which of the following should you use to handle notifications programmatically?

A. Amazon Kinesis Firehose
B. Amazon Simple Queue Service (Amazon SQS)
C. Amazon Simple Email Service (Amazon SES)
D. Amazon AppStream

Answer: B

Explanation:
As CloudTrail sends a notification each time a log file is written to the Amazon S3 bucket, an account that's very active can generate a large number of notifications. If you subscribe using email or SMS, you can end up receiving more messages than you can handle. AWS recommends that you subscribe using Amazon Simple Queue Service (Amazon SQS), which lets you handle notifications programmatically.
Reference:
http://docs.aws.amazon.com/awscloudtrail/latest/userguide/getting_notifications_configuration.ht ml

NEW QUESTION # 313
A DevOps Engineer is asked to implement a strategy for deploying updates to a web application with zero downtime. The application infrastructure is defined in AWS CloudFormation and is made up of an Amazon Route 53 record, an Application Load Balancer, Amazon EC2 instances in an EC2 Auto Scaling group, and Amazon DynamoDB tables. To avoid downtime, there must be an active instance serving the application at all times.
Which strategies will ensure the deployment happens with zero downtime? (Choose two.)

A. In the CloudFormation template, modify the AWS::AutoScaling::AutoscalingGroup resource and add an UpdatePolicy attribute to define the required elements for a deployment with zero downtime.
B. Add a new Application Load Balancer and Auto Scaling group to the CloudFormation template. Modify the AWS::AutoScaling::AutoScalingGroup resource and add an UpdatePolicy attribute to perform rolling updates.
C. In the CloudFormation template, modify the UpdatePolicy attribute for the CloudFormation stack and specify the Auto Scaling group that will be updated. Configure MinSuccessfulInstancesPercent and PauseTime to ensure the deployment happens with zero downtime.
D. Add a new Application Load Balancer and Auto Scaling group to the CloudFormation template. Deploy new changes to the inactive Auto Scaling group. Use Route 53 to change the active Application Load Balancer.
E. In the CloudFormation template, modify the AWS:: AutoScaling::DeploymentUpdates resource and add an UpdatePolicy attribute to define the required elements for a deployment with zero downtime.

Answer: A,D

NEW QUESTION # 314
An IT department manages a portfolio with Windows and Linux (Amazon and Red Hat Enterprise Linux) servers both on-premises and on AWS. An audit reveals that there is no process for updating OS and core application patches, and that the servers have inconsistent patch levels. Which of the following provides the MOST reliable and consistent mechanism for updating and maintaining all servers at the recent OS and core application patch levels?

A. Install the AWS OpsWorks agent on all on-premises and AWS servers. Create an OpsWorks stack with separate layers for each operating system, and get a recipe from the Chef supermarket to run the patch commands for each layer during maintenance windows.
B. Use AWS Systems Manager Parameter Store to securely store credentials for each Linux and Windows server. Create Systems Manager Resource Groups. Use the Systems Manager Run Command to remotely deploy patch updates using the credentials in Systems Manager Parameter Store
C. Install AWS Systems Manager agent on all on-premises and AWS servers. Create Systems Manager Resource Groups. Use Systems Manager Patch Manager with a preconfigured patch baseline to run scheduled patch updates during maintenance windows.
D. Use a shell script to install the latest OS patches on the Linux servers using yum and schedule it to run automatically using cron. Use Windows Update to automatically patch Windows servers.

Answer: C

Explanation:
1- https://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-patch-patchgroups.html 2- https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-patch.html

NEW QUESTION # 315
......

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