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NEW QUESTION 33 A company hosts its staging website using an Amazon EC2 instance backed with Amazon EBS storage. The company wants to recover quickly with minimal data losses in the event of network connectivity issues or power failures on the EC2 instance. Which solution will meet these requirements?

• A. Create an Amazon CloudWatch alarm for the StatusCheckFailed_System metric and select the EC2 action to recover the instance.
• B. Add the instance to an EC2 Auto Scaling group with a lifecycle hook to detach the EBS volume when the EC2 instance shuts down or terminates.
• C. Add the instance to an EC2 Auto Scaling group with the minimum, maximum, and desired capacity set to 1.
• D. Create an Amazon CloudWatch alarm for the StatusCheckFailed_Instance metric and select the EC2 action to reboot the instance.

Answer: C Explanation: Explanation/Reference: https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-maintain-instance-levels.html   NEW QUESTION 34 You recently encountered a major bug in your Windows-based web application during a deployment cycle. During this failed deployment, it took the team four hours to roll back to a previously working state, which left customers with a poor user experience. During the post-mortem, your team discussed the need to provide a quicker way to roll back failed deployments. You currently run your web application on Amazon EC2 using Windows 2012R2 and use Elastic Load Balancing for your load balancing needs. Which technique should you use to solve this problem?

• A. Create deployable versioned bundles of your application. Store the bundle on Amazon S3. Re-deploy your web application using an AWS OpsWorks stack, and use AWS OpsWorks application versioning to initiate a rollback during failures.
• B. Re-deploy your web application using an AWS OpsWorks stack, and use the AWS OpsWorks auto-rollback feature to initiate a rollback during failures.
• C. Re-deploy your web application using Elastic Beanstalk, and use the Elastic Beanstalk API to trigger a FailedDeployment API call to initiate a rollback to the previous version.
• D. Re-deploy your web application using Elastic Beanstalk, and use the Elastic Beanstalk application versions when deploying. During failures, re-deploy the previous version to the Elastic Beanstalk environment.
• E. Create deployable versioned bundles of your application. Store the bundles on Amazon S3. Re-deploy your web application on Elastic Beanstalk, and enable the Elastic Beanstalk auto- rollback feature tied to CloudWatch metrics that define failure.

Answer: D   NEW QUESTION 35 A DevOps Engineer needs to design and implement a backup mechanism for Amazon EFS. The Engineer is given the following requirements: - The backup should run on schedule. - The backup should be stopped if the backup window expires. - The backup should be stopped if the backup completes before the backup window. - The backup logs should be retained for further analysis. - The design should support highly available and fault-tolerant paradigms. - Administrators should be notified with backup metadata. Which design will meet these requirements?

• A. Use AWS Data Pipeline with an Amazon CloudWatch Events rule for scheduling the start/stop of backup activity. Run backup scripts on Amazon EC2 in a single Availability Zone. Use Auto Scaling lifecycle hooks and the SSM Run Command on EC2 for uploading the backup logs to Amazon RDS. Use Amazon SNS to notify administrators with backup activity metadata.
• B. Use AWS Lambda with an Amazon CloudWatch Events rule for scheduling the start/stop of backup activity. Run backup scripts on Amazon EC2 in an Auto Scaling group. Use Auto Scaling lifecycle hooks and the SSM Run Command on EC2 for uploading backup logs to Amazon S3. Use Amazon SNS to notify administrators with backup activity metadata.
• C. Use AWS CodePipeline with an Amazon CloudWatch Events rule for scheduling the start/stop of backup activity. Run backup scripts on Amazon EC2 in a single Availability Zone. Use Auto Scaling lifecycle hooks and the SSM Run Command on Amazon EC2 for uploading backup logs to Amazon S3. Use Amazon SES to notify admins with backup activity metadata.
• D. Use Amazon SWF with an Amazon CloudWatch Events rule for scheduling the start/stop of backup activity. Run backup scripts on Amazon EC2 in an Auto Scaling group. Use Auto Scaling lifecycle hooks and the SSM Run Command on EC2 for uploading backup logs to Amazon Redshift. Use CloudWatch Alarms to notify administrators with backup activity metadata.

Answer: B Explanation: https://aws.amazon.com/solutions/implementations/efs-to-efs-backup-solution/   NEW QUESTION 36 You have an I/O and network-intensive application running on multiple Amazon EC2 instances that cannot handle a large ongoing increase in traffic. The Amazon EC2 instances are using two Amazon EBS PIOPS volumes each, and each instance is identical. Which of the following approaches should be taken in order to reduce load on the instances with the least disruption to the application?

• A. Addan instance-store volume for each running Amazon EC2 instance and implementRAID striping to improve I/O performance.
• B. Createan AMI from each instance, and set up Auto Scaling groups with a largerinstance type that has enhanced networking enabled and is Amazon EBS-optimized.
• C. Stopeach instance and change each instance to a larger Amazon EC2 instance typethat has enhanced networking enabled and is Amazon EBS-optimized. Ensure thatRAID striping is also set up on each instance.
• D. Createan AMI from an instance, and set up an Auto Scaling group with an instance typethat has enhanced networking enabled and is Amazon EBS-optimized.
• E. Addan Amazon EBS volume for each running Amazon EC2 instance and implement RAIDstripingto improve I/O performance.

Answer: D Explanation: Explanation The AWS Documentation mentions the following on AMI's An Amazon Machine Image (AMI) provides the information required to launch an instance, which is a virtual server in the cloud. You specify an AM I when you launch an instance, and you can launch as many instances from the AMI as you need. You can also launch instances from as many different AMIs as you need. For more information on AMI's, please visit the link: * http://docs.aws.amazon.com/AWSCC2/latest/UserGuide/AMIs.html   NEW QUESTION 37 As part of your continuous deployment process, your application undergoes an I/O load performance test before it is deployed to production using new AMIs. The application uses one Amazon Elastic Block Store (EBS) PIOPS volume per instance and requires consistent I/O performance. Which of the following must be carried out to ensure that I/O load performance tests yield the correct results in a repeatable manner?

• A. Ensure that the I/O block sizes for the test are randomly selected.
• B. Ensure that snapshots of the Amazon EBS volumes are created as a backup.
• C. Ensure that the Amazon EBS volume is encrypted.
• D. Ensure that the Amazon EBS volumes have been pre-warmed by reading all the blocks before the test.

Answer: D Explanation: Explanation During the AMI-creation process, Amazon CC2 creates snapshots of your instance's root volume and any other CBS volumes attached to your instance New CBS volumes receive their maximum performance the moment that they are available and do not require initialization (formerly known as pre-warming). However, storage blocks on volumes that were restored from snapshots must to initialized (pulled down from Amazon S3 and written to the volume) before you can access the block. This preliminary action takes time and can cause a significant increase in the latency of an I/O operation the first time each block is accessed. For most applications, amortizing this cost over the lifetime of the volume is acceptable. Option A is invalid because block sizes are predetermined and should not be randomly selected. Option C is invalid because this is part of continuous integration and hence volumes can be destroyed after the test and hence there should not be snapshots created unnecessarily Option D is invalid because the encryption is a security feature and not part of load tests normally. For more information on CBS initialization please refer to the below link: * http://docs.aws.a mazon.com/AWSCC2/latest/UserGuide/ebs-in itialize.html   NEW QUESTION 38 ......