Amazon DOP-C02 Practice Questions - Page 32

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Question 311

You have been asked to handle a large data migration from multiple Amazon RDS MySQL instances to a DynamoDB table. You have been given a short amount of time to complete the data migration.

What will allow you to complete this complex data processing workflow?

Create an Amazon Kinesis data stream, pipe in all of the Amazon RDS data, and direct the data toward a DynamoDB table.

Write a script in your language of choice, install the script on an Amazon EC2 instance, and then use Auto Scaling groups to ensure that the latency of the migration pipelines never exceeds four seconds in any 15-minute period.

Write a bash script to run on your Amazon RDS instance that will export data into DynamoDB.

Create a data pipeline to export Amazon RDS data and import the data into DynamoDB.

Question 312

Your application requires a fault-tolerant, low-latency and repeatable method to load configurations files via Auto Scaling when Amazon Elastic Compute Cloud (EC2) instances launch.

Which approach should you use to satisfy these requirements?

Securely copy the content from a running Amazon EC2 instance.

Use an Amazon EC2 UserData script to copy the configurations from an Amazon Storage Services (S3) bucket.

Use a script via cfn-init to pull content hosted in an Amazon ElastiCache cluster.

Use a script via cfn-init to pull content hosted on your on-premises server.

Use an Amazon EC2 UserData script to pull content hosted on your on-premises server.

Question 313

Currently, your deployment process consists of setting your load balancer to point to a maintenance page, turning off ea web application servers, deploying your code, turning the web application servers back on, and removing the maintenance page. Working with your development team, you've agreed that performing rolling deployments of your software would provide a better user experience and a more agile deployment process.

Which techniques could you use to provide a cost-effective rolling deployment process? (Choose two.)

Select all that apply

Use the Amazon Elastic Cloud Compute (EC2) API to write a service to return a list of servers based on the tags for the application that needs deployment, and use Amazon Simple Queue Service to queue up all servers for a rolling deployment.

Re-deploy your application on AWS Elastic Beanstalk, and use Elastic Beanstalk rolling deployments.

Re-deploy your application on an AWS OpsWorks stack, and take advantage of OpsWorks rolling deployments.

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

Re-deploy your application using an AWS CloudFormation template with Auto Scaling group, and use update policies to provide rolling updates.

Using Amazon Simple Workflow Service, create a workflow application that talks to the Amazon EC2 API to deploy your new code in a rolling fashion.

Question 314

You manage a web advertising platform on a single AWS account. This platform produces realtime ad-click data that you store as objects in an Amazon S3 bucket called "dick-data." Your advertising partners want to use Amazon Elastic MapReduce in their own AWS accounts to do analytics on the ad-click data. They have asked for immediate access to the ad-dick data so that they can run analytics.

Which two choices are required to facilitate secure access to this data? (Choose two.)

Select all that apply

Create a cross-account TAM role with a trust policy that contains partner AWS account IDs and a unique external ID.

Create a new IAM group for AWS Data Pipeline users with a trust policy that contains partner AWS account IDs.

Configure an Amazon S3 bucket policy for the "click-data" bucket that allows Read-Only access to the objects, and associate this policy with an IAM role.

Configure the Amazon S3 bucket access control list to allow access to the partners Amazon Elastic MapReduce cluster.

Configure AWS Data Pipeline in the partner AWS accounts to use the web Identity Federation API to access data in the "click-data" bucket.

Configure AWS Data Pipeline to transfer the data from the ''click-data" bucket to the partner's Amazon Elastic MapReduce cluster.

Question 315

You run a SIP-based telephony application that uses Amazon EC2 for its web tier and uses MySQL on Amazon RDS as its database. The application stores only the authentication profile data for its existing users in the database and therefore is read-intensive. Your monitoring system shows that your web instances and the database have high CPU utilization.

Which of the following steps should you take in order to ensure the continual availability of your application? (Choose two.)

Select all that apply

Use a CloudFront RTMP download distribution with the application tier as the origin for the distribution.

Set up an Auto Scaling group for the application tier and a policy that scales based on the Amazon EC2 CloudWatch CPU utilization metric.

Vertically scale up the Amazon EC2 instances manually.

Set up an Auto Scaling group for the application tier and a policy that scales based on the Amazon RDS CloudWatch CPU utilization metric.

Switch to General Purpose (SSD) Storage from Provisioned IOPS Storage (PIOPS) for the Amazon RDS database.

Use multiple Amazon RDS read replicas.

Question 316

Your team is responsible for an AWS Elastic Beanstalk application. The business requires that you move to a continuous deployment model, thus releasing updates to the application multiple times per day with zero downtime.

What should you do to enable this and still be able to roll back to the previous version almost immediately in an emergency?

Enable roiling updates in the Elastic Beanstalk environment and set an appropriate pause time for application startup.

Create a second Elastic Beanstalk environment that runs the new application version, and swap the environment CNAMEs.

Configure the application to poll for a new application version in your code repository; download and install the new version to each running Elastic Beanstalk instance.

Create a second Elastic Beanstalk environment with the new application version, and configure the old environment to use the HTTP 301 response code to redirect clients to the new environment.

Question 317

Your Company wants to perform A/B testing on a new website feature for 20 percent of its users. The website uses CloudFront for whole site delivery, with some content cached for up to 24 hours. How do you enable this testing for the required proportion of users while minimizing performance impact?

Configure the web servers to handle two domain names. The feature is switched on or off depending on which domain name is used for a request. Configure a CloudFront origin for each domain name, and configure the CloudFront distribution to use one origin for 20 percent of users and the other origin for the other 80 percent.

Configure the CloudFront distribution to forward a cookie specific to this feature. For requests where the cookie is not set, the web servers set its value to ''on" for 20 percent of responses and "off" for 80 percent. For requests where the cookie is set, the web servers use Its value to determine whether the feature should be on or off for the response.

Create a second stack of web servers that host the website with the feature on. Using Amazon Route53, create two resource record sets with the same name: one with a weighting of "1" and a value of this new stack; the other a weighting of "4" and a value of the existing stack. Use the resource record set's name as the CloudFront distribution's origin.

Invalidate all of the CloudFront distribution's cache items that the feature affects. On future requests, the web servers create responses with the feature on for 20 percent of users, and off for 80 percent. The web servers set "Cache-Control: no-cache" on all of these responses.

Question 318

You have been asked to use your departments existing continuous Integration (CI) tool to test a three-tier web architecture defined In an AWS CloudFormation template. The tool already supports AWS APIs and can launch new AWS CloudFormation stacks after polling version control. The CI tool reports on the success of the AWS CloudFormation stack creation by using the Describe Stacks API to look for the CREATE COMPLETE status. The architecture tiers defined in the template consist of:

- One load balancer

- Five Amazon EC2 instances running the web application

- One multi-AZ Amazon ROS instance

How would you implement this? (Choose two.)

Select all that apply

Define a WaitCondition and a WaitConditionHandle for the output of a UserData command that does sanity checking of the application's post-install state.

Define a CustomResource and write a script that runs architecture-level Integration tests through the load balancer to the application and database for the state of multiple tiers.

Define a WaitCondition and use a WaitConditionHandle that leverages the AWS SDK to run the DescribeStacks API call until the CREATE COMPLETE status is returned.

Define a CustomResource that leverages the AWS SDK to run the DescribeStacks API call until the 'CREATE COMPLETE status is returned.

Define a UserDataHandle for the output of a UserData command that does sanity checking of the application's post-install state and runs integration tests on the state of multiple tiers through the load balancer to the application.

Define a UserDataHandle for the output of a CustomResource that does sanity checking of the application's post-install state.

Question 319

You are building a large, multi-tenant SaaS (software-as-a-service) application with a component that fetches data to process from a customer-specific Amazon S3 bucket in their account.

How should you ensure that your application follows security best practices and limits risk when fetching data from customer-owned Amazon S3 buckets?

Have users create an IAM user with a policy that grants read-only access to the Amazon S3 bucket required by your application, and store the corresponding access keys in an encrypted database that holds their account data.

Have users create a cross-account lAM role with a policy that grants read-only access to the Amazon S3 bucket required by your application to the AWS account ID running your production Sass application.

Have users create an Amazon S3 bucket policy that grants read-only access to the Amazon S3 bucket required by your application, and securely store the corresponding access keys in the database holding their account data.

Have users create an Amazon S3 bucket policy that grants read-only access to the Amazon S3 bucket required by your application and limits access to the public IP address of the SaaS application.

Question 320

You have a fleet of Elastic Compute Cloud (EC2) instances in an Auto Scaling group. All of these instances are running Microsoft Windows Server 2012 backed by Amazon Elastic Block Store (EBS). These instances were launched through AWS CloudFormation. You have determined that your instances are underutilized, and in order to save some money, have decided to modify the instance type of the fleet. In which of the following ways can you achieve the desired result during a scheduled maintenance window? (Choose two.)

Select all that apply

Create a new Auto Scaling launch configuration specifying the new instance type, associate it to the existing Auto Scaling group, and terminate the running instances.

Identify the new instance type in the user data and restart the running instances one at a time.

Use the AWS Command Line Interface (CLI) to modify the instance type of each running instance.

Change the instance type in the AWS CloudFormation template that was used to create the Amazon EC2 instances, and then update the stack.

Take snapshots of the running instances, and launch new instances based on those snapshots.

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