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Exam Amazon AWS-DevOps-Engineer-Professional Vce - AWS-DevOps-Engineer-Professional Valid Test Format

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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q475-Q480):

NEW QUESTION # 475
You have a development team that is continuously spending a lot of time rolling back updates for an
application. They work on changes, and if the change fails, they spend more than 5-6h in rolling back the
update. Which of the below options can help reduce the time for rolling back application versions.

A. Use Elastic Beanstalk and re-deploy using Application Versions
B. Use CloudFormation and update the stack with the previous template
C. Use S3 to store each version and then re-deploy with Elastic Beanstalk
D. Use OpsWorks and re-deploy using rollback feature.

Answer: A

Explanation:
Explanation
Option B is invalid because Clastic Beanstalk already has the facility to manage various versions and you don't
need to use S3 separately for this.
Option C is invalid because in Cloudformation you will need to maintain the versions. Clastic Beanstalk can
so that automatically for you.
Option D is good for production scenarios and Clastic Beanstalk is great for development scenarios.
AWS beanstalk is the perfect solution for developers to maintain application versions.
With AWS Clastic Beanstalk, you can quickly deploy and manage applications in the AWS Cloud without
worrying about the infrastructure that runs those
applications. AWS Clastic Beanstalk reduces management complexity without restricting choice or control.
You simply upload your application, and AWS Clastic
Beanstalk automatically handles the details of capacity provisioning, load balancing, scaling, and application
health monitoring.
For more information on AWS Beanstalk please refer to the below link:
* https://aws.amazon.com/documentation/elastic-beanstalk/

NEW QUESTION # 476
For AWS Auto Scaling, what is the first transition state an existing instance enters after leaving Standby state?

A. Pending
B. EnteringStandby
C. Terminating:Wait
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 # 477
You currently have the following setup in AWS
1) An Elastic Load Balancer
2) Auto Scaling Group which launches EC2 Instances
3) AMIs with your code pre-installed
You want to deploy the updates of your app to only a certain number of users. You want to have a cost-effective solution. You should also be able to revert back quickly. Which of the below solutions is the most feasible one?

A. Create new AM Is with the new app. Then use the new EC2 instances in half proportion to the older instances.
B. Create a full second stack of instances, cut the DNS over to the new stack of instances, and change the DNS back if a rollback is needed.
C. Redeploy with AWS Elastic Beanstalk and Elastic Beanstalk versions. Use Route 53 Weighted Round Robin records to adjust the proportion of traffic hitting the two ELBs
D. Create a second ELB, and a new Auto Scaling Group assigned a new Launch Configuration. Create a new AMI with the updated app. Use Route53 Weighted Round Robin records to adjust the proportion of traffic hitting the two ELBs.

Answer: D

Explanation:
The Weighted Routing policy of Route53 can be used to direct a proportion of traffic to your application. The best option is to create a second CLB, attach the new Autoscaling Group and then use Route53 to divert the traffic.
Option B is wrong because just having EC2 instances running with the new code will not help.
Option C is wrong because Clastic beanstalk is good for development environments, and also there is no mention of having 2 environments where environment url's
can be swapped.
Option D is wrong because you still need Route53 to split the traffic.
For more information on Route53 routing policies, please refer to the below link:
http://docs.aws.a mazon.com/Route53/latest/DeveloperGuide/routing-policy. html

NEW QUESTION # 478
A large enterprise is deploying a web application on AWS. The application runs on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Auto Scaling group across multiple Availability Zones. The application stores data in an Amazon RDS Oracle DB instance and Amazon DynamoDB.
There are separate environments for development, testing, and production.
What is the MOST secure and flexible way to obtain password credentials during deployment?

A. Launch the EC2 instances with an EC2 IAM role to access AWS services. Retrieve the database credentials from AWS Secrets Manager.
B. Retrieve an access key from an AWS Systems Manager plaintext parameter to access AWS services.
Retrieve the database credentials from a Systems Manager SecureString parameter.
C. Launch the EC2 instances with an EC2 IAM role to access AWS services. Store the database passwords in an encrypted config file with the application artifacts.
D. Retrieve an access key from an AWS Systems Manager SecureString parameter to access AWS services. Retrieve the database credentials from a Systems Manager SecureString parameter.

Answer: C

NEW QUESTION # 479
You are a Devops Engineer and are designing an Opswork stack in AWS. The company has some custom recipes that are part of their on-premise Chef configuration. These same recipes need to be run whenever an instance is launched in Opsworks. Which of the following steps need to be carried out to to ensure this requirement gets fulfilled. Choose 2 answers from the options given below

A. Ensurethe custom cookbooks option is set in Opswork layer.
B. Ensurethe custom cookbooks option is set in Opswork stack.
C. Ensurethe recipe is placed as part of the Setup Lifecycle event as part of the Stacksetting.
D. Ensurethe recipe is placed as part of the Setup Lifecycle event as part of the Layersetting.

Answer: B,D

Explanation:
Explanation
The AWS Documentation mentions the below
Each layer has a set of built-in recipes assigned to each lifecycle event, although some layers lack Undeploy recipes. When a lifecycle event occurs on an instance, AWS OpsWorks Stacks runs the appropriate set of recipes for the associated layer.
The below diagram shows a snapshot in the stack settings where you can enable custom cookbooks

For more information on automating recipe's, please visit the below URL:
http://docs.aws.amazon.com/opsworks/latest/userguide/workingcookbook-assigningcustom.html

NEW QUESTION # 480
......

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