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NEW QUESTION 43
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 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.B. 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 ELBsC. Create new AM Is with the new app. Then use the new EC2 instances in half proportion to the older instances.D. 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.

Answer: A

Explanation:
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 44
When you add lifecycle hooks to an Autoscaling Group, what are the wait states that occur during the scale in and scale out process. Choose 2 answers from the options given below

A. Exiting:WaitB. Pending:WaitC. Terminating:WaitD. Launching:Wait

Answer: B,C

Explanation:
Explanation
The AWS Documentation mentions the following
After you add lifecycle hooks to your Auto Scaling group, they work as follows:
1. Auto Scaling responds to scale out events by launching instances and scale in events by terminating instances.
2. Auto Scaling puts the instance into a wait state (Pending:Wait orTerminating: Wait). The instance is paused until either you tell Auto Scaling to continue or the timeout period ends.
For more information on Autoscaling Lifecycle hooks, please visit the below URL: * http://docs.aws.a mazon.com/autoscaling/latest/userguide/lifecycle-hooks.htm I

 

NEW QUESTION 45
A DevOps Engineer is responsible for the deployment of a PHP application. The Engineer is working in a hybrid deployment, with the application running on both on-premises servers and Amazon EC2 instances. The application needs access to a database containing highly confidential information. Application instances need access to database credentials, which must be encrypted at rest and in transit before reaching the instances.
How should the Engineer automate the deployment process while also meeting the security requirements?

A. Use AWS CodeDeploy to deploy application packages to the instances. Store database credentials on AWS Systems Manager Parameter Store using the Secure String data type. Define an IAM role with an attached policy that allows decryption of the database credentials. Associate this role to all the instances and on-premises servers.B. Use AWS CodeDeploy to deploy application packages to the instances. Store database credentials on AWS Systems Manager Parameter Store using the Secure String data type. Define an IAM policy for allowing access, and decrypt only the database credentials. Attach the IAM policy to the role associated to the instance profile for CodeDeploy-managed instances, and to the role used for on-premises instances registration on CodeDeploy.C. Use AWS CodeDeploy to deploy application packages to the instances. Store database credentials in the AppSpec file. Define an IAM policy for allowing access to only the database credentials. Attach the IAM policy to the role associated to the instance profile for CodeDeploy-managed instances and the role used for on-premises instances registration on CodeDeploy.D. Use AWS Elastic Beanstalk with a PHP platform configuration to deploy application packages to the instances. Store database credentials on AWS Systems Manager Parameter Store using the Secure String data type. Define an IAM role for Amazon EC2 allowing access, and decrypt only the database credentials. Associate this role to all the instances.

Answer: B

 

NEW QUESTION 46
If you want CloudFormation stack status updates to show up in a continuous delivery system in as close to real time as possible, how should you achieve this?

A. Subscribe your continuous delivery system to an SNS topic that you also tell your CloudFormation stack to publish events into.B. Subscribe your continuous delivery system to an SQS queue that you also tell your CloudFormation stack to publish events into.C. Use a long-poll on the Resources object in your CloudFormation stack and display those state changes in the UI for the system.D. Use a long-poll on the <code>ListStacksAPI</code> call for your CloudFormation stack and display those state changes in the UI for the system.

Answer: A

Explanation:
Use NotificationARNs.member.N when making a CreateStack call to push stack events into SNS in nearly real- time.
Reference:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacksmonitor- stack.html

 

NEW QUESTION 47
Within an IAM policy, can you add an IfExists condition at the end of a Null condition?

A. Yes, you can add an IfExists condition at the end of a Null condition.B. Yes, you can add an IfExists condition at the end of a Null condition but not in all Regions.C. Yes, you can add an IfExists condition at the end of a Null condition depending on the condition.D. No, you cannot add an IfExists condition at the end of a Null condition.

Answer: D

Explanation:
Within an IAM policy, IfExists can be added to the end of any condition operator except the Null condition. It can be used to indicate that conditional comparison needs to happen if the policy key is present in the context of a request; otherwise, it can be ignored.
Reference:
http://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements.html

 

NEW QUESTION 48
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