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Amazon AWS Certified DevOps Engineer - Professional (DOP-C01) Sample Questions (Q178-Q183):

NEW QUESTION # 178
For auditing, analytics, and troubleshooting purposes, a DevOps Engineer for a data analytics application needs to collect all of the application and Linux system logs from the Amazon EC2 instances before termination. The company, on average, runs 10,000 instances in an Auto Scaling group. The company requires the ability to quickly find logs based on instance IDs and date ranges.
Which is the MOST cost-effective solution?

  • A. Create an EC2 Instance-terminate Lifecycle Action on the group, push the logs into Amazon Kinesis Data Firehouse, and select Amazon ES as the destination for providing storage and search capability.
  • B. Create an EC2 Instance-terminate Lifecycle Action on the group, write a termination script for pushing logs into Amazon CloudWatch Logs, create a CloudWatch Events rule to trigger an AWS Lambda function to create a catalog of log files in an Amazon DynamoDB table with the primary key being Instance ID and sort key being Instance Termination Date.
  • C. Create an EC2 Instance-terminate Lifecycle Action on the group, write a termination script for pushing logs into Amazon S3, and trigger an AWS Lambda function based on S3 PUT to create a catalog of log files in an Amazon DynamoDB table with the primary key being Instance ID and sort key being Instance Termination Date.
  • D. Create an EC2 Instance-terminate Lifecycle Action on the group, create an Amazon CloudWatch Events rule based on it to trigger an AWS Lambda function for storing the logs in Amazon S3, and create a catalog of log files in an Amazon DynamoDB table with the primary key being Instance ID and sort key being Instance Termination Date.

Answer: A


NEW QUESTION # 179
Which of these configuration or deployment practices is a security risk for RDS?

  • A. Non-Multi-AZ RDS instance
  • B. Having RDS and EC2 instances exist in the same subnet
  • C. Storing SQL function code in plaintext
  • D. RDS in a public subnet

Answer: D

Explanation:
Making RDS accessible to the public internet in a public subnet poses a security risk, by making your database directly addressable and spammable.
DB instances deployed within a VPC can be configured to be accessible from the Internet or from EC2 instances outside the VPC. If a VPC security group specifies a port access such as TCP port
22, you would not be able to access the DB instance because the firewall for the DB instance provides access only via the IP addresses specified by the DB security groups the instance is a member of and the port defined when the DB instance was created.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.RDSSecurityGroups.html


NEW QUESTION # 180
A company has a legacy application running on AWS. The application can only run on one Amazon EC2 instance at a time. Application metadata is stored in Amazon S3 and must be retrieved if the instance is restarted. The instance should be automatically restarted or relaunched if performance degrades.
Which solution will satisfy these requirements?

  • A. Create an Amazon CloudWatch alarm to monitor the EC2 instance. When the StatusCheckFailed system alarm is triggered, use the recover action to stop and start the instance. Use a trigger in Amazon S3 to push the metadata to the instance when it is back up and running.
  • B. Use AWS CloudFormation to create an EC2 instance that includes the user-data property for the EC2 resource. Add a command in user-data to retrieve the application metadata from Amazon S3.
  • C. Use the auto healing feature in AWS OpsWorks to stop and start the EC2 instance. Use a lifecycle event in OpsWorks to pull the data from Amazon S3 and update it on the instance.
  • D. Use the Auto Recovery feature in Amazon EC2 to automatically stop and start the EC2 instance in case of a failure. Use a trigger in Amazon S3 to push the metadata to the instance when it is back up and running.

Answer: B

Explanation:
Explanation/Reference: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/deploying.applications.html


NEW QUESTION # 181
Your company needs to automate 3 layers of a large cloud deployment. You want to be able to track this deployment's evolution as it changes over time, and carefully control any alterations.
What is a good way to automate a stack to meet these requirements?

  • A. Use Elastic Beanstalk Linked Applications, passing the important DNS entires between layers using the metadata interface.
  • B. Use OpsWorks Stacks with three layers to model the layering in your stack.
  • C. Use CloudFormation Nested Stack Templates, with three child stacks to represent the three logical layers of your cloud.
  • D. Use AWS Config to declare a configuration set that AWS should roll out to your cloud.

Answer: C

Explanation:
Only CloudFormation allows source controlled, declarative templates as the basis for stack automation. Nested Stacks help achieve clean separation of layers while simultaneously providing a method to control all layers at once when needed.
https://blogs.aws.amazon.com/application-management/post/Tx1T9JYQOS8AB9I/Use-Nested- Stacks-to- Create-Reusable-Templates-and-Support-Role-Specialization


NEW QUESTION # 182
A DevOps Engineer is using AWS CodeDeploy across a fleet of Amazon EC2 instances in an EC2 Auto Scaling group. The associated CodeDeploy deployment group, which is integrated with EC2 Auto Scaling, is configured to perform in-place deployments with CodeDeployDefault.OneAtATime. During an ongoing new deployment, the Engineer discovers that, although the overall deployment finished successfully, two out of five instances have the previous application revision deployed. The other three instances have the newest application revision.
What is likely causing this issue?

  • A. EC2 Auto Scaling launched two new instances while the new deployment had not yet finished, causing the previous version to be deployed on the affected instances.
  • B. The two affected instances failed to fetch the new deployment.
  • C. The CodeDeploy agent was not installed in two affected instances.
  • D. A failed AfterInstall lifecycle event hook caused the CodeDeploy agent to roll back to the previous version on the affected instances.

Answer: A


NEW QUESTION # 183
......

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