AWS Certified Developer - Associate

• #221

  A Developer is creating an application that needs to locate the public IPv4 address of the Amazon EC2 instance on which it runs. How can the application locate this information?

  • AGet the instance metadata by retrieving http://169.254.169.254/latest/metadata/.
  • BGet the instance user data by retrieving http://169.254.169.254/latest/userdata/.
  • CGet the application to run IFCONFIG to get the public IP address.
  • DGet the application to run IPCONFIG to get the public IP address.
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• #222

  A developer is using AWS CodeDeploy to deploy an application running on Amazon EC2. The developer wants to change the file permissions for a specific deployment file. Which lifecycle event should a developer use to meet this requirement?

  • AAfterInstall.
  • BDownloadBundle.
  • CBeforeInstall.
  • DValidateService.
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• #223

  A company is using AWS CodeBuild to compile a website from source code stored in AWS CodeCommit. A recent change to the source code has resulted in the CodeBuild project being unable to successfully compile the website. How should the Developer identify the cause of the failures?

  • AModify the buildspec.yml file to include steps to send the output of build commands to Amazon CloudWatch.
  • BUse a custom Docker image that includes the AWS X-Ray agent in the AWS CodeBuild project configuration.
  • CCheck the build logs of the failed phase in the last build attempt in the AWS CodeBuild project build history.
  • DManually re-run the build process on a local machine so that the output can be visualized.
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• #224

  What does an Amazon SQS delay queue accomplish?

  • AMessages are hidden for a configurable amount of time when they are first added to the queue.
  • BMessages are hidden for a configurable amount of time after they are consumed from the queue.
  • CThe consumer can poll the queue for a configurable amount of time before retrieving a message.
  • DMessage cannot be deleted for a configurable amount of time after they are consumed from the queue.
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• #225

  A Developer is creating a template that uses AWS CloudFormation to deploy an application. This application is serverless and uses Amazon API Gateway, Amazon DynamoDB, and AWS Lambda. Which tool should the Developer use to define simplified syntax for expressing serverless resources?

  • ACloudFormation serverless intrinsic functions.
  • BAWS serverless express.
  • CAn AWS serverless application model.
  • DA CloudFormation serverless plugin.
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• #226

  A company is developing a new online game that will run on top of Amazon ECS. Four distinct Amazon ECS services will be part of the architecture, each requiring specific permissions to various AWS services. The company wants to optimize the use of the underlying Amazon EC2 instances by bin packing the containers based on memory reservation. Which configuration would allow the Development team to meet these requirements MOST securely?

  • ACreate a new Identity and Access Management (IAM) instance profile containing the required permissions for the various ECS services, then associate that instance role with the underlying EC2 instances.
  • BCreate four distinct IAM roles, each containing the required permissions for the associated ECS service, then configure each ECS service to reference the associated IAM role.
  • CCreate four distinct IAM roles, each containing the required permissions for the associated ECS service, then, create an IAM group and configure the ECS cluster to reference that group.
  • DCreate four distinct IAM roles, each containing the required permissions for the associated ECS service, then configure each ECS task definition to referenсe the associated IAM role.
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• #227

  A developer wants the ability to roll back to a previous version of an AWS Lambda function in the event of errors caused by a new deployment. How can the developer achieve this with MINIMAL impact on users?

  • AChange the application to use an alias that points to the current version. Deploy the new version of the code. Update the alias to use the newly deployed version. If too many errors are encountered, point the alias back to the previous version.
  • BChange the application to use an alias that points to the current version. Deploy the new version of the code. Update the alias to direct 10% of users to the newly deployed version. If too many errors are encountered, send 100% of traffic to the previous version.
  • CDo not make any changes to the application Deploy the new version of the code. If too many errors are encountered, point the application back to the previous version using the version number in the Amazon Resource Name (ARN).
  • DCreate three aliases: new, existing, and router. Point the existing alias to the current version. Have the router alias direct 100% of users to the existing alias. Update the application to use the router alias. Deploy the new version of the code. Point the new alias to this version. Update the router alias to direct 10% of users to the new alias. If too many errors are encountered, send 100% of traffic to the existing alias.
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• #228

  A Developer has been asked to build a real-time dashboard web application to visualize the key prefixes and storage size of objects in Amazon S3 buckets. Amazon DynamoDB will be used to store the Amazon S3 metadata. What is the optimal and MOST cost-effective design to ensure that the real-time dashboard is kept up to date with the state of the objects in the Amazon S3 buckets?

  • AUse an Amazon CloudWatch event backed by an AWS Lambda function. Issue an Amazon S3 API call to get a list of all Amazon S3 objects and persist the metadata within DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
  • BUse Amazon S3 Event Notification backed by a Lambda function to persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
  • CRun a cron job within an Amazon EC2 instance to list all objects within Amazon S3 and persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
  • DCreate a new Amazon EMR cluster to get all the metadata about Amazon S3 objects; persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
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• #229Pilih 2

  A Developer has written an Amazon Kinesis Data Streams application. As usage grows and traffic increases over time, the application is regularly receiving ProvisionedThroughputExceededException error messages. Which steps should the Developer take to resolve the error? (Choose TWO)

  • AUse Auto Scaling to scale the stream for better performance.
  • BIncrease the delay between the GetRecords call and the PutRecords call.
  • CIncrease the number of shards in the data stream.
  • DSpecify a shard iterator using the ShardIterator parameter.
  • EImplement exponential backoff on the GetRecords call and the PutRecords call.
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• #230

  Which of the following is chosen as the default region when making an API call with an AWS SDK?

  • Aap-northeast-1.
  • Bus-west-2.
  • Cus-east-1.
  • Deu-west-1.
  • Eus-central-1.
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• #231

  A Developer is preparing a deployment package using AWS CloudFormation. The package consists of two separate templates: one for the infrastructure and one for the application. The application has to be inside the VPC that is created from the infrastructure template. How can the application stack refer to the VPC created from the infrastructure template?

  • AUse the Ref function to import the VPC into the application stack from the infrastructure template.
  • BUse the export flag in the infrastructure template, and then use the Fn::ImportValue function in the application template.
  • CUse the DependsOn attribute to specify that the application instance depends on the VPC in the application template.
  • DUse the Fn::GetAtt function to include the attribute of the VPC in the application template.
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• #232

  A Developer implemented a static website hosted in Amazon S3 that makes web service requests hosted in Amazon API Gateway and AWS Lambda. The site is showing an error that reads: No Access-Control-Allow-Origin header is present on the requested resource. Origin null is therefore not allowed access.' What should the Developer do to resolve this issue?

  • AEnable cross-origin resource sharing (CORS) on the S3 bucket.
  • BEnable cross-origin resource sharing (CORS) for the method in API Gateway.
  • CAdd the Access-Control-Request-Method header to the request.
  • DAdd the Access-Control-Request-Headers header to the request.
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• #233

  A company is running an application built on AWS Lambda functions. One Lambda function has performance issues when it has to download a 50MB file from the Internet in every execution. This function is called multiple times a second. What solution would give the BEST performance increase?

  • ACache the file in the /tmp directory.
  • BIncrease the Lambda maximum execution time.
  • CPut an Elastic Load Balancer in front of the Lambda function.
  • DCache the file in Amazon S3.
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• #234

  A current architecture uses many Lambda functions invoking one another as large state machine. The coordination of this state machine is legacy custom code that breaks easily. Which AWS Service can help refactor and manage the state machine?

  • AAWS Data Pipeline.
  • BAWS SNS with AWS SQS.
  • CAmazon Elastic MapReduce.
  • DAWS Step Functions.
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• #235

  A company has a web application that uses an Amazon Cognito user pool for authentication. The company wants to create a login page with the company logo. What should a Developer do to meet these requirements?

  • ACreate a hosted user interface in Amazon Cognito and customize it with the company logo.
  • BCreate a login page with the company logo and upload it to Amazon Cognito.
  • CCreate a login page in Amazon API Gateway with the logo and save the link in Amazon Cognito.
  • DUpload the logo to the Amazon Cognito app settings and point to the logo on a custom login page.
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• #236

  A Developer is writing a REST service that will add items to a shopping list. The service is built on Amazon API Gateway with AWS Lambda integrations. The shopping list items are send as query string parameters in the method request. How should the Developer convert the query string parameters to arguments for the Lambda function?

  • AEnable request validation.
  • BInclude the Amazon Resource Name (ARN) of the Lambda function.
  • CChange the integration type.
  • DCreate a mapping template.
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• #237

  A Developer has been asked to create an AWS Lambda function that is triggered any time updates are made to items in an Amazon DynamoDB table. The function has been created, and appropriate permissions have been added to the Lambda execution role. Amazon DynamoDB streams have been enabled for the table, but the function is still not being triggered. Which option would enable DynamoDB table updates to trigger the Lambda function?

  • AChange the StreamViewType parameter value to NEW_AND_OLD_IMAGES for the DynamoDB table.
  • BConfigure event source mapping for the Lambda function.
  • CMap an Amazon SNS topic to the DynamoDB streams.
  • DIncrease the maximum execution time (timeout) setting of the Lambda function.
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• #238Pilih 2

  Which of the following services are included at no additional cost with the use of the AWS platform?

  • ASimple Storage Service.
  • BElastic Compute Cloud.
  • CAuto Scaling.
  • DElastic Load Balancing.
  • ECloudFormation.
  • FSimple Workflow Service.
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• #239

  A Developer has published an update to an application that is served to a global user base using Amazon CloudFront. After deploying the application, users are not able to see the updated changes. How can the Developer resolve this issue?

  • ARemove the origin from the CloudFront configuration and add it again.
  • BDisable forwarding of query strings and request headers from the CloudFront distribution configuration.
  • CInvalidate all the application objects from the edge caches.
  • DDisable the CloudFront distribution and enable it again to update all the edge locations.
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• #240Pilih 2

  A Developer wants to use AWS X-Ray to trace a user request end-to-end throughput the software stack. The Developer made the necessary changes in the application tested it, and found that the application is able to send the traces to AWS X-Ray. However, when the application is deployed to an EC2 instance, the traces are not availableWhich of the following could create this situation? (Choose TWO)

  • AThe traces are reaching X-Ray, but the Developer does not have access to view the records.
  • BThe X-Ray daemon is not installed on the EC2 instance.
  • CThe X-Ray endpoint specified in the application configuration is incorrect.
  • DThe instance role does not have xray:BatchGetTraces and xray:GetTraceGraph permissions.The instance role does not have xray:PutTraceSegments and xray:PutTelemetryRecords permissions.
  • EThe instance role does not have xray:PutTraceSegments and xray:PutTelemetryRecords permissions.
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