AWS Certified Developer - Associate

• #121

  An application is real-time processing millions of events that are received through an API. What service could be used to allow multiple consumers to process the data concurrently and MOST cost-effectively?

  • AAmazon SNS with fanout to an SQS queue for each application.
  • BAmazon SNS with fanout to an SQS FIFO (first-in, first-out) queue for each application.
  • CAmazon Kinesis Firehose.
  • DAmazon Kinesis Streams.
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• #122

  Where should the appspec.yml file be placed in order for AWS CodeDeploy to work?

  • AIn the root of the application source code directory structure.
  • BIn the bin folder along with all the complied code.
  • CIn an S3 bucket.
  • DIn the same folder as the application configuration files.
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• #123

  A Developer is creating a mobile application that will not require users to log in. What is the MOST efficient method to grant users access to AWS resources?

  • AUse an identity provider to securely authenticate with the application.
  • BCreate an AWS Lambda function to create an IAM user when a user accesses the application.
  • CCreate credentials using AWS KMS and apply these credentials to users when using the application.
  • DUse Amazon Cognito to associate unauthenticated users with an IAM role that has limited access to resources.
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• #124

  If a message is retrieved from a queue in Amazon SQS, how long is the message inaccessible to other users by default?

  • A0 seconds.
  • B1 hour.
  • C1 day.
  • Dforever.
  • E30 seconds.
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• #125

  An application writes items to an Amazon DynamoDB table. As the application scales to thousands of instances, calls to the DynamoDB API generate occasional ThrottlingException errors. The application is coded in a language incompatible with the AWS SDK. How should the error be handled?

  • AAdd exponential backoff to the application logic.
  • BUse Amazon SQS as an API message bus.
  • CPass API calls through Amazon API Gateway.
  • DSend the items to DynamoDB through Amazon Kinesis Data Firehose.
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• #126

  A Developer has setup an Amazon Kinesis Stream with 4 shards to ingest a maximum of 2500 records per second. A Lambda function has been configured to process these records. In which order will these records be processed?

  • ALambda will receive each record in the reverse order it was placed into the stream following a LIFO (last-in, first-out) method.
  • BLambda will receive each record in the exact order it was placed into the stream following a FIFO (first­-in, first-out) method.
  • CLambda will receive each record in the exact order it was placed into the shard following a FIFO (first-in, first-out) method. There is no guarantee of order across shards.
  • DThe Developer can select FIFO, (first-in, first-out), LIFO (last-in, last-out), random, or request specific record using the getRecords API.
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• #127

  A Developer has an e-commerce API hosted on Amazon ECS. Variable and spiking demand on the application is causing order processing to take too long. The application processes Amazon SQS queues. The ApproximateNumberOfMessagesVisible metric spikes at very high values throughout the day, which cause Amazon CloudWatch alarm breaches. Other ECS metrics for the API containers are well within limits. What can the Developer implement to improve performance while keeping costs low?

  • ATarget tracking scaling policy.
  • BDocker Swarm.
  • CService scheduler.
  • DStep scaling policy.
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• #1282টি বাছুন

  A Developer must repeatedly and consistently deploy a serverless RESTful API on AWS. Which techniques will work? (Choose TWO)

  • ADefine a Swagger file. Use AWS Elastic Beanstalk to deploy the Swagger file.
  • BDefine a Swagger file. Use AWS CodeDeploy to deploy the Swagger file.
  • CDeploy a SAM template with an inline Swagger definition.
  • DDefine a Swagger file. Deploy a SAM template that references the Swagger file.
  • EDefine an inline Swagger definition in a Lambda function. Invoke the Lambda function.
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• #129

  A company has developed a new serverless application using AWS Lambda functions that will be deployed using the AWS Serverless Application Model (AWS SAM) CLI. Which step should the developer complete prior to deploying the application?

  • ACompress the application to a .zip file and upload it into AWS Lambda.
  • BTest the new AWS Lambda function by first tracing it in AWS X-Ray.
  • CBundle the serverless application using a SAM package.
  • DCreate the application environment using the eb create my-env command.
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• #130

  A Developer has an Amazon DynamoDB table that must be in provisioned mode to comply with user requirements. The application needs to support the following: Average item size: 10 KB. Item reads each second: 10 strongly consistent. Item writes each second: 2 transactional. Which read and write capacity cost-effectively meets these requirements?

  • ARead 10; write 2.
  • BRead 30; write 40.
  • CUse on-demand scaling.
  • DRead 300; write 400.
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• #131

  A Developer has developed a web application and wants to deploy it quickly on a Tomcat server on AWS. The Developer wants to avoid having to manage the underlying infrastructure. What is the easiest way to deploy the application, based on these requirements?

  • AAWS CloudFormation.
  • BAWS Elastic Beanstalk.
  • CAmazon S3.
  • DAWS CodePipeline
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• #132

  An application takes 40 seconds to process instructions received in an Amazon SQS message. Assuming the SQS queue is configured with the default VisibilityTimeout value, what is the BEST way, upon receiving a message, to ensure that no other instances can retrieve a message that has already been processed or is currently being processed?

  • AUse the ChangeMessageVisibility API to increase the VisibilityTimeout, then use the DeleteMessage API to delete the message.
  • BUse the DeleteMessage API call to delete the message from the queue, then call DeleteQueue API to remove the queue.
  • CUse the ChangeMessageVisibility API to decrease the timeout value, then use the DeleteMessage API to delete the message.
  • DUse the DeleteMessageVisibility API to cancel the VisibilityTimeout, then use the DeleteMessage API to delete the message.
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• #133

  An AWS Lambda function generates a 3MB JSON file and then uploads it to an Amazon S3 bucket daily. The file contains sensitive information, so the Developer must ensure that it is encrypted before uploading to the bucket. Which of the following modifications should the Developer make to ensure that the data is encrypted before uploading it to the bucket?

  • AUse the default AWS KMS customer master key for S3 in the Lambda function code.
  • BUse the S3 managed key and call the GenerateDataKey API to encrypt the file.
  • CUse the GenerateDataKey API, then use that data key to encrypt the file in the Lambda function code.
  • DUse a custom KMS customer master key created for S3 in the Lambda function code.
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• #134

  A company needs a new REST API that can return information about the contents of an Amazon S3 bucket, such as a count of the objects stored in it. The company has decided that the new API should be written as a microservice using AWS Lambda and Amazon API Gateway. How should the Developer ensure that the microservice has the necessary access to the Amazon S3 bucket, while adhering to security best practices?

  • ACreate an IAM user that has permissions to access the Amazon S3 bucket, and store the IAM user credentials in the Lambda function source code.
  • BCreate an IAM role that has permissions to access the Amazon S3 bucket and assign it to the Lambda function as its execution role.
  • CCreate an Amazon S3 bucket policy that specifies the Lambda service as its principal and assign it to the Amazon S3 bucket.
  • DCreate an IAM role, attach the AmazonS3FullAccess managed policy to it, and assign the role to the Lambda function as its execution role.
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• #135

  A Developer is using AWS CLI, but when running list commands on a large number of resources, it is timing out. What can be done to avoid this time-out?

  • AUse pagination.
  • BUse shorthand syntax.
  • CUse parameter values.
  • DUse quoting strings.
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• #136

  A developer added a new feature to an application running on an Amazon EC2 instance that uses Amazon SQS. After deployment, the developer noticed a significant increase in Amazon SQS costs. When monitoring the Amazon SQS metrics on Amazon CloudWatch, the developer found that on average one message per minute is posted on this queue. What can be done to reduce Amazon SQS costs for this application?

  • AIncrease the Amazon SQS queue polling timeout.
  • BScale down the Amazon SQS queue to the appropriate size for low traffic demand.
  • CConfigure push delivery via Amazon SNS instead of polling the Amazon SQS queue.
  • DUse an Amazon SQS first-in, first-out (FIFO) queue instead of a standard queue.
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• #137

  A Developer needs to design an application running on AWS that will be used to consume Amazon SQS messages that range from 1 KB up to 1GB in size. How should the Amazon SQS messages be managed?

  • AUse Amazon S3 and the Amazon SQS CLI.
  • BUse Amazon S3 and the Amazon SQS Extended Client Library for Java.
  • CUse Amazon EBS and the Amazon SQS CLI.
  • DUse Amazon EFS and the Amazon SQS CLI.
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• #138

  A developer is testing an application that invokes an AWS Lambda function asynchronously. During the testing phase, the Lambda function fails to process after two retries. How can the developer troubleshoot the failure?

  • AConfigure AWS CloudTrail logging to investigate the invocation failures.
  • BConfigure Dead Letter Queues by sending events to Amazon SQS for investigatio.
  • CConfigure Amazon Simple Workflow Service to process any direct unprocessed events.
  • DConfigure AWS Config to process any direct unprocessed events.
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• #139

  A Developer is designing a new application that uses Amazon S3. To satisfy compliance requirements, the Developer must encrypt the data at rest. How can the Developer accomplish this?

  • AUse s3:x-amz-acl as a condition in the S3 bucket policy.
  • BUse Amazon RDS with default encryption.
  • CUse aws:SecureTransport as a condition in the S3 bucket policy.
  • DTurn on S3 default encryption for the S3 bucket.
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• #140

  A company has 25,000 employees and is growing. The company is creating an application that will be accessible to its employees only. A developer is using Amazon S3 to store images and Amazon RDS to store application data. The company requires that all employee information remain in the legacy Security Assertion Markup Language (SAML) employee directory only and is not interested in mirroring any employee information on AWS. How can the developer provide authorized access for the employees who will be using this application so each employee can access their own application data only?

  • AUse Amazon VPC and keep all resources inside the VPC, and use a VPC link for the S3 bucket with the bucket policy.
  • BUse Amazon Cognito user pools, federate with the SAML provider, and use user pool groups with an IAM policy.
  • CUse an Amazon Cognito identity pool, federate with the SAML provider, and use an IAM condition key with a value for the cognito-identity.amazonaws.com:sub variable to grant access to the employees.
  • DCreate a unique IAM role for each employee and have each employee assume the role to access the application so they can access their personal data only.
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