Amazon DOP-C02 Practice Questions

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Question 301

You would like to run automated, continuous application level integration tests on all members of an Auto Scaling group. Which two options should you use?

(Choose two.)

Select all that apply

A. Use the AWS SDK to run the DescribeInstances API call on the Auto Scaling group, and then iterate over the members and remotely connect to each Amazon EC2 instance and run the integration tests.

B. Use the AWS SDK to run the DescribeAutoScalinglnstances API call on the Auto Scaling Group, iterate over the members using the Describe Instances API call, remotely connect to each Amazon EC2 instance, and then run the integration tests.

C. Set up a custom CloudWatch metric with the output of your integration tests that are run by a scheduled process on each instance, and then set up a CloudWatch alert for any failures.

D. Using an Auto Cycle Group lifecycle policy, define a scheduled task to run integration tests when a new Amazon EC2 instance enters the InService state.

E. Set up a custom CloudWatch metric that uses the output of the DescribeAutoScalingInstances API call to determine the HealthCheck status of the Amazon EC2 instances.

F. Using the Auto Cycle Group lifecycle policy, define a scheduled task to run integration tests on individual instances using the Amazon EC2 user data to export test data to CloudWatch Logs.

Question 302

Your application Amazon Elastic Compute Cloud (EC2) instances bootstrap by using a master configuration file that is kept in a version-enabled Amazon Simple Storage Service (S3) bucket. Which one of the following methods should you use to securely install the current configuration version onto the instances in a cost- effective way?

A. Create an Amazon DynamoDB table to store the different versions of the configuration file. Associate AWS Identity and Access Management (IAM) EC2 roles to the Amazon EC2 instances, and reference the DynamoDB table to get the latest file from Amazon Simple Storage Service (S3).

B. Associate an IAM S3 role to the bucket, list the object versions using the Amazon S3 API, and then get the latest object.

C. Associate an IAM EC2 role to the instances, list the object versions using the Amazon S3 API, and then get the latest object.

D. Associate an IAM EC2 role to the instances, and then simply get the object from Amazon S3, because the default is the current version.

Question 303

Your company operates a website for promoters to sell tickets for entertainment events. You are using a load balancer in front of an Auto Scaling group of web servers. Promotion of popular events can cause surges of website visitors.

During scaling-out at these times, newly launched instances are unable to complete configuration quickly enough, leading to user disappointment. What options should you choose to improve scaling yet minimize costs? (Choose two.)

Select all that apply

A. Create an AMI with the application pre-configured. Create a new Auto Scaling launch configuration using this new AMI, and configure the Auto Scaling group to launch with this AMI.

B. Use Auto Scaling pre-warming to launch instances before they are required. Configure pre-warming to use the CPU trend CloudWatch metric for the group.

C. Publish a custom CloudWatch memo from your application on the number of tickets sold, and create an Auto Scaling policy based on this.

D. Use the history of past scaling events for similar event sales to predict future scaling requirements. Use the Auto Scaling scheduled scaling feature to vary the size of the fleet.

E. Configure an Amazon S3 bucket for website hosting. Upload into the bucket an HTML holding page with its x-amz-website-redirect-location' metadata property set to the load balancer endpoint. Configure Elastic Load Balancing to redirect to the holding page when the load on web servers is above a certain level.

Question 304

You are responsible for a popular file sharing application that uses Elastic Load Balancing to distribute traffic to an Amazon EC2 application tier deployed in an Auto Scaling group that runs across multiple Availability Zones. You currently record the number of user file transfers to a log file on the application server, and then write data points from the logs to an Amazon RDS MySQL instance. You are not happy with how your application scales, and want to implement a new scaling policy based on the average number of user file transfers in a 10-minute period instead of average CPU utilization in the last five minutes.

What steps should you take to ensure that your application tier scales based on this new policy? (Choose two.)

Select all that apply

A. Create a new CloudWatch alarm based on the Elastic Load Balancing "RequestCount" metric that triggers an Auto Scaling action to scale the application tier.

B. Create a new CloudWatch alarm based on a custom metric streaming from the Amazon RDS MySQL instance that triggers an Auto Scaling action to scale the application tier.

C. Create a new CloudWatch alarm based on a custom metric published from file transfer logs streaming to CloudWatch that triggers an Auto Scaling action to scale the application tier.

D. Create a new Auto Scaling launch configuration that includes an Amazon EC2 user data script that installs a CloudWatch Logs Agent on newly launched instances in the application tier. The agent will be configured to stream the file transfers log tile to CloudWatch.

E. Create a new Auto Scaling launch configuration for the application tier that scales based on an Auto Scaling policy that reads the file transfer log data from the Amazon RIDS MySQL instance.

F. Create a new Auto Scaling launch configuration that includes an Amazon EC2 user data script that installs an Amazon RDS Logs Agent on newly launched instances in the application tier. The agent will be configured to stream the file transfer data points to the Auto Scaling group.

Question 305

Your DevOps team is responsible for a multi-tier, Windows-based web application consisting of web servers, Amazon RDS database instances, and a load balancer behind Amazon Route53. You have been asked by your manager to build a cost-effective rolling deployment solution for this web application.

What method should you use?

A. Re-deploy your application on an AWS OpsWorks stack. Use the AWS OpsWorks done stack feature to allow updates between duplicate stacks.

B. Re-deploy your application on Elastic Beanstalk and take advantage of Elastic BeanStalk rolling updates.

C. Re-deploy your application using an AWS CloudFormation template, launch a new AWS CloudFormation stack during each deployment, and then tear down the old stack.

D. Re-deploy your application using an AWS CloudFormation template. Use AWS CloudFormation rolling deployment policies, create a new policy for your AWS CloudFormation stack, and initiate an update stack operation to deploy new code.

Question 306

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 bundles on Amazon S3. Re-deploy your web application on Elastic Beanstalk, and enable the Elastic Beanstalk autorollback feature tied to CloudWatch metrics that define failure.

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. 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.

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. 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.

Question 307

Which technique should you use to solve this problem?

A. By using the Elastic Load Balancing Latency CloudWatch metric.

B. By using the HTTP X-Forwarded-For header for requests from the load balancer.

C. By running a distributed load test to the load balancer.

D. By using the load balancer access logs.

Question 308

Your company operates an application consisting of an AWS CloudFormation stack that contains a load balancer, an Auto Scaling group of web servers, and an Amazon RDS instance. To save time and costs, you update the current test stack when testing minor changes, and create a new stack for major changes. As part of the testing procedure of your application, each version needs to be registered once and only once with a Configuration Management Database (CMDB).

What cost-effective solution should you choose to perform this registration?

A. Use Auto Scaling Leader Node functionality to notify the registration application from the UserData script of a single Instance. Use the AWS CloudFormation cfn-hup helper application to receive template updates on the leader node, which then notifies the CMDB.

B. Define an AWS: :CloudFormation::CustomResource in the AWS CloudFormation template, with the application version as one of its properties. Modify the CMDB to subscribe to the resource's creation and update notifications.

C. Define an AWS::CloudFormation::HttpRequest in the AWS CloudFormation template, and configure it to notify the CMDB on stack creation and update.

D. Define an AWS::EC2::Instance resource in the AWS CloudFormation template that is configured to run a UserData script to notify the CMDB and then terminate itself on completion.

Question 309

Which technique should you use to solve this problem?

A. Your load balancers use an HTTP health check, and the page relies on retrieving data from your database.

C. The cooldown period of the Auto Scaling group is too short, so the instances do not have enough time to recover from an issue.

D. Your Auto Scaling group health check type is set to "EC2" to check that the instances themselves are healthy.

Question 310

Which technique should you use to solve this problem?

A. Create a tag for all instances that specifies their environment. When launching instances, provide an Amazon EC2 UserData script that gets this tag by querying the MetaData Service and registers the agent with the master.

B. Use Amazon CloudFormation to describe your environment. Configure an input parameter for the master server hostname/address, and use this parameter within an Amazon EC2 UserData script that registers the agent with the master.

C. Create a script on your third-party configuration management master server that queries the Amazon EC2 API for new instances and registers them with it.

D. Use Amazon Simple Workflow Service to automate the process of registering new instances with your master server. Use an Environment tag in Amazon EC2 to register instances with the correct master server.

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