Amazon DVA-C02 Practice Test - Questions Answers, Page 21
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A company has implemented a pipeline in AWS CodePipeline. The company Is using a single AWS account and does not use AWS Organizations. The company needs to test its AWS CloudFormation templates in its primary AWS Region and a disaster recovery Region.
Which solution will meet these requirements with the MOST operational efficiency?
In the CodePipeline pipeline, implement an AWS CodeDeploy action for each Region to deploy and test the Cloud Formation templates. Update CodePipeline and AWS CodeBuild with appropriate permissions.
Configure CodePipeline to deploy and test the Cloud Formation templates. Use CloudFormation StackSets to start deployment across both Regions.
Configure CodePipeline to invoke AWS CodeBuild to deploy and test the CloudFormation templates in each Region. Update CodeBuild and CloudFormation with appropriate permissions.
Use the Snyk action in CodePipeline to deploy and test the CloudFormation templates in each Region.
A developer created an AWS Lambda function that accesses resources in a VPC. The Lambda function polls an Amazon Simple Queue Service (Amazon SOS) queue for new messages through a VPC endpoint. Then the function calculates a rolling average of the numeric values that are contained in the messages. After initial tests of the Lambda function, the developer found that the value of the rolling average that the function returned was not accurate.
How can the developer ensure that the function calculates an accurate rolling average?
Set the function's reserved concurrency to 1. Calculate the rolling average in the function. Store the calculated rolling average in Amazon ElastiCache.
Modify the function to store the values in Amazon ElastiCache. When the function initializes, use the previous values from the cache to calculate the rolling average.
Set the function's provisioned concurrency to 1. Calculate the rolling average in the function. Store the calculated rolling average in Amazon ElastiCache.
Modify the function to store the values in the function's layers. When the function initializes, use the previously stored values to calculate the rolling average.
A developer is building an ecommerce application that uses multiple AWS Lambda functions. Each function performs a specific step in a customer order workflow, such as order processing and inventory management.
The developer must ensure that the Lambda functions run in a specific order.
Which solution will meet this requirement with the LEAST operational overhead?
Configure an Amazon Simple Queue Service (Amazon SQS) queue to contain messages about each step a function must perform. Configure the Lambda functions to run sequentially based on the order of messages in the SQS queue.
Configure an Amazon Simple Notification Service (Amazon SNS) topic to contain notifications about each step a function must perform. Subscribe the Lambda functions to the SNS topic. Use subscription filters based on the step each function must perform.
Configure an AWS Step Functions state machine to invoke the Lambda functions in a specific order.
Configure Amazon EventBridge Scheduler schedules to invoke the Lambda functions in a specific order.
A company hosts a client-side web application for one of its subsidiaries on Amazon S3. The web application can be accessed through Amazon CloudFront from https://www.example.com. After a successful rollout, the company wants to host three more client-side web applications for its remaining subsidiaries on three separate S3 buckets.
To achieve this goal, a developer moves all the common JavaScript files and web fonts to a central S3 bucket that serves the web applications. However, during testing, the developer notices that the browser blocks the JavaScript files and web fonts.
What should the developer do to prevent the browser from blocking the JavaScript files and web fonts?
Create four access points that allow access to the central S3 bucket. Assign an access point to each web application bucket.
Create a bucket policy that allows access to the central S3 bucket. Attach the bucket policy to the central S3 bucket.
Create a cross-origin resource sharing (CORS) configuration that allows access to the central S3 bucket. Add the CORS configuration to the central S3 bucket.
Create a Content-MD5 header that provides a message integrity check for the central S3 bucket. Insert the Content-MD5 header for each web application request.
A company runs a new application on AWS Elastic Beanstalk. The company needs to deploy updates to the application. The updates must not cause any downtime for application users. The deployment must forward a specified percentage of incoming client traffic to a new application version during an evaluation period.
Which deployment type will meet these requirements?
Rolling
Traffic-splitting
In-place
Immutable
A company is creating a new application that gives users the ability to upload and share short video files. The average size of the video files is 10 MB. After a user uploads a file, a message needs to be placed into an Amazon Simple Queue Service (Amazon SQS) queue so the file can be processed. The files need to be accessible for processing within 5 minutes.
Which solution will meet these requirements MOST cost-effectively?
Write the files to Amazon S3 Glacier Deep Archive. Add the S3 location of the files to the SQS queue.
Write the files to Amazon S3 Standard. Add the S3 location of the files to the SQS queue.
Write the files to an Amazon Elastic Block Store (Amazon EBS) General Purpose SSD volume. Add the EBS location of the files to the SQS queue.
Write messages that contain the contents of the uploaded files to the SQS queue.
A developer needs to retrieve all data from an Amazon DynamoDB table that matches a particular partition key.
Which solutions will meet this requirement in the MOST operationally efficient way? (Select TWO.)
Use the Scan API and a filter expression to match on the key.
Use the GetItem API with a request parameter for key that contains the partition key name and specific key value.
Use the ExecuteStatement API and a filter expression to match on the key.
Use the GetItem API and a PartiQL statement to match on the key.
Use the ExecuteStatement API and a PartiQL statement to match on the key.
A company has a web application that contains an Amazon API Gateway REST API. A developer has created an AWS CloudFormation template for the initial deployment of the application. The developer has deployed the application successfully as part of an AWS CodePipeline continuous integration and continuous delivery (CI/CD) process. All resources and methods are available through the deployed stage endpoint.
The CloudFormation template contains the following resource types:
* AWS::ApiGateway::RestApi
* AWS::ApiGateway::Resource
* AWS::ApiGateway::Method
* AWS:ApiGateway::Stage
* AWS::ApiGateway:;Deployment
The developer adds a new resource to the REST API with additional methods and redeploys the template. CloudFormation reports that the deployment is successful and that the stack is in the UPDATE_COMPLETE state. However, calls to all new methods are returning 404 (Not Found) errors.
What should the developer do to make the new methods available?
Specify the disable-rollback option during the update-stack operation.
Unset the Cloud Forma lion stack failure options.
Add an AWS CodeBuild stage lo CodePipeline to run the aws apigateway create-deployment AWS CLI command.
Add an action to CodePipeline to run the aws cloudfront create-invalidation AWS CLI command.
A company is developing an application that will be accessed through the Amazon API Gateway REST API. Registered users should be the only ones who can access certain resources of this API. The token being used should expire automatically and needs to be refreshed periodically.
How can a developer meet these requirements?
Create an Amazon Cognito identity pool, configure the Amazon Cognito Authorizer in API Gateway, and use the temporary credentials generated by the identity pool.
Create and maintain a database record for each user with a corresponding token and use an AWS Lambda authorizer in API Gateway.
Create an Amazon Cognito user pool, configure the Cognito Authorizer in API Gateway, and use the identity or access token.
Create an 1AM user for each API user, attach an invoke permissions policy to the API. and use an I AM authorizer in API Gateway.
A developer manages a website that distributes its content by using Amazon CloudFront. The website's static artifacts are stored in an Amazon S3 bucket.
The developer deploys some changes and can see the new artifacts in the S3 bucket. However, the changes do not appear on the webpage that the CloudFront distribution delivers.
How should the developer resolve this issue?
Configure S3 Object Lock to update to the latest version of the files every time an S3 object is updated.
Configure the S3 bucket to clear all old objects from the bucket before new artifacts are uploaded.
Set CloudFront to invalidate the cache after the artifacts have been deployed to Amazon S3.
Set CloudFront to modify the distribution origin after the artifacts have been deployed to Amazon S3.
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