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NEW QUESTION 40
A company has an application that is using a MySQL -compatible Amazon Aurora Multi-AZ DB cluster as the database A cross-Region read replica has been created for disaster recovery purposes A DevOps engineer wants to automate the promotion of the replica so it becomes the primary database instance in the event of a failure Which solution will accomplish this?

• A. Configure a latency-based Amazon Route 53 CNAME with health checks so it points to both the primary and replica endpoints Subscribe an Amazon SNS topic to Amazon RDS failure notifications from AWS CloudTrail and use that topic to trigger an AWS Lambda function that will promote the replica instance as the master.
• B. Store the Aurora endpoint in AWS Systems Manager Parameter Store Create an Amazon EventBridge (Amazon CloudWatch Events) event that detects the database failure and runs an AWS Lambda function to promote the replica instance and update the endpoint URL stored in AWS Systems Manager Parameter Store Code the application to reload the endpoint from Parameter Store if a database connection fails.
• C. Create an Aurora custom endpoint to point to the primary database instance Configure the application to use this endpoint Configure AWS CloudTrail to run an AWS Lambda function to promote the replica instance and modify the custom endpoint to point to the newly promoted instance.
• D. Create an AWS Lambda function to modify the application's AWS CloudFormation template to promote the replica, apply the template to update the stack, and pout the application to the newly promoted instance Create an Amazon CloudWatch alarm to trigger this Lambda function after the failure event occurs

Answer: D

NEW QUESTION 41
A user has attached an EBS volume to a running Linux instance as a "/dev/sdf" device. The user is unable to see the attached device when he runs the command "df -h".
What is the possible reason for this?

• A. The volume is not in the same AZ of the instance
• B. The volume is not formatted
• C. The volume is not mounted
• D. The volume is not attached as a root device

Answer: C

Explanation:
When a user creates an EBS volume and attaches it as a device, it is required to mount the device. If the device/volume is not mounted it will not be available in the listing.

NEW QUESTION 42
A DevOps Engineer manages a web application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The instances run in an EC2 Auto Scaling group across multiple Availability Zones. The Engineer needs to implement a deployment strategy that:
- Launches a second fleet of instances with the same capacity as the
original fleet.
- Maintains the original fleet unchanged while the second fleet is
launched.
- Transitions traffic to the second fleet when the second fleet is
fully deployed.
- Terminates the original fleet automatically 1 hour after transition.
Which solution will satisfy these requirements?

• A. Use AWS Elastic Beanstalk with the configuration set to Immutable. Create an .ebextension using the Resources key that sets the deletion policy of the ALB to 1 hour, and deploy the application.
• B. Use an AWS CloudFormation template with a retention policy for the ALB set to 1 hour. Update the Amazon Route 53 record to reflect the new ALB.
• C. Use AWS CodeDeploy with a deployment group configured with a blue/green deployment configuration. Select the option Terminate the original instances in the deployment group with a waiting period of 1 hour.
• D. Use two AWS Elastic Beanstalk environments to perform a blue/green deployment from the original environment to the new one. Create an application version lifecycle policy to terminate the original environment in 1 hour.

Answer: D

NEW QUESTION 43
A DevOps Engineer is reviewing a system that uses Amazon EC2 instances in an Auto Scaling group. This system uses a configuration management tool that runs locally on each EC2 instance. Because of the volatility of the application load, new instances must be fully functional within 3 minutes of entering a running state.
Current setup tasks include:
* Installing the configuration management agent - 2 minutes
* Installing the application framework - 15 minutes
* Copying configuration data from Amazon S3 - 2 minutes
* Running the configuration management agent to configure instances - 1 minute
* Deploying the application code from Amazon S3 - 2 minutes
How should the Engineer set up system so it meets the launch time requirement?

• A. Trigger an AWS Lambda function from an Amazon CloudWatch Events rule when a new EC2 instance launches. Have the function install the configuration management agent and the application framework, pull configuration data from Amazon S3, run the agent to configure the instance, and deploy the application from S3.
• B. Write a bootstrap script to install the configuration management agent, install and the application framework, pull configuration data from Amazon S3, run the agent to configure the instance, and deploy the application from S3.
• C. Build a custom AMI that includes the configuration management agent and application framework.
  Write a bootstrap script to pull configuration data from Amazon S3, run the agent to configure the instance, and deploy the application from S3.
• D. Build a custom AMI that includes the configuration management agent, application framework, and configuration data. Write a bootstrap script to run the agent to configure the instance and deploy the application from Amazon S3.

Answer: D

NEW QUESTION 44
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