AWS Certified Developer - Associate

• #281

  When a Simple Queue Service message triggers a task that takes 5 minutes to complete, which process below will result in successful processing of the message and remove it from the queue while minimizing the chances of duplicate processing?

  • ARetrieve the message with an increased visibility timeout, process the message, delete the message from the queue.
  • BRetrieve the message with an increased visibility timeout, delete the message from the queue, process the message.
  • CRetrieve the message with increased DelaySeconds, process the message, delete the message from the queue.
  • DRetrieve the message with increased DelaySeconds, delete the message from the queue, process the message.
  解答を表示
• #282

  An AWS Lambda function accesses two Amazon DynamoDB tables. A developer wants to improve the performance of the Lambda function by identifying bottlenecks in the function. How can the developer inspect the timing of the DynamoDB API calls?

  • AAdd DynamoDB as an event source to the Lambda function. View the performance with Amazon CloudWatch metrics.
  • BPlace an Application Load Balancer (ALB) in front of the two DynamoDB tables. Inspect the ALB logs.
  • CLimit Lambda to no more than five concurrent invocations Monitor from the Lambda console.
  • DEnable AWS X-Ray tracing for the function. View the traces from the X-Ray service.
  解答を表示
• #283

  A Developer is creating an Auto Scaling group whose instances need to publish a custom metric to Amazon CloudWatch. Which method would be the MOST secure way to authenticate a CloudWatch PUT request?

  • ACreate an IAM user with PutMetricData permission and put the user credentials in a private repository; have applications pull the credentials as needed.
  • BCreate an IAM user with PutMetricData permission, and modify the Auto Scaling launch configuration to inject the user credentials into the instance user data.
  • CModify the CloudWatch metric policies to allow the PutMetricData permission to instances from the Auto Scaling group.
  • DCreate an IAM role with PutMetricData permission and modify the Auto Scaling launching configuration to launch instances using that role.
  解答を表示
• #284

  An application that runs on an Amazon EC2 instance needs to access and make API calls to multiple AWS services. What is the MOST secure way to provide access to the AWS services with MINIMAL management overhead?

  • AUse AWS KMS to store and retrieve credentials.
  • BUse EC2 instance profiles.
  • CUse AWS root user to make requests to the application.
  • DStore and retrieve credentials from AWS CodeCommit.
  解答を表示
• #285

  When developing an AWS Lambda function that processes Amazon Kinesis Data Streams, Administrators within the company must receive a notice that includes the processed data. How should the Developer write the function to send processed data to the Administrators?

  • ASeparate the Lambda handler from the core logic.
  • BUse Amazon CloudWatch Events to send the processed data.
  • CPublish the processed data to an Amazon SNS topic.
  • DPush the processed data to Amazon SQS.
  解答を表示
• #286

  A company is developing a web application that allows its employees to upload a profile picture to a private Amazon S3 bucket. There is no size limit for the profile pictures, which should be displayed every time an employee logs in. For security reasons, the pictures cannot be publicly accessible. What is a viable long-term solution for this scenario?

  • AGenerate a presigned URL when a picture is uploaded. Save the URL in an Amazon DynamoDB table. Return the URL to the browser when the employee logs in.
  • BSave the picture's S3 key in an Amazon DynamoDB table. Create an Amazon S3 VPC endpoint to allow the employees to download pictures once they log in.
  • CEncode a picture using base64. Save the base64 string in an Amazon DB table. Allow the browser to retrieve the string and convert it to a picture.
  • DSave the picture's S3 key in an Amazon DynamoDB table. Use a function to generate a presigned URL every time an employee logs in. Return the URL to the browser.
  解答を表示
• #2872 つ選択

  A Developer is working on a serverless project based in Java. Initial testing shows a cold start takes about 8 seconds on average for AWS Lambda functions. What should the Developer do to reduce the cold start time? (Choose TWO)

  • AAdd the Spring Framework to the project and enable dependency injection.
  • BReduce the deployment package by including only needed modules from the AWS SDK for Java.
  • CIncrease the memory allocation setting for the Lambda function.
  • DIncrease the timeout setting for the Lambda function.
  • EChange the Lambda invocation mode from synchronous to asynchronous.
  解答を表示
• #288

  A Developer is testing a Docker-based application that uses the AWS SDK to interact with Amazon DynamoDB. In the local development environment, the application has used IAM access keys. The application is now ready for deployment onto an ECS cluster. How should the application authenticate with AWS services in production?

  • AConfigure an ECS task IAM role for the application to use.
  • BRefactor the application to call AWS STS AssumeRole based on an instance role.
  • CConfigure AWS access key/secret access key environment variables with new credentials.
  • DConfigure the credentials file with a new access key/secret access key.
  解答を表示
• #289

  A Developer wants to build an application that will allow new users to register and create new user accounts. The application must also allow users with social media accounts to log in using their social media credentials. Which AWS service or feature can be used to meet these requirements?

  • AAWS IAM.
  • BAmazon Cognito identity pools.
  • CAmazon Cognito user pools.
  • DAWS Directory Service.
  解答を表示
• #290

  A Software Engineer developed an AWS Lambda function in Node.js to do some CPU-intensive data processing. With the default settings, the Lambda function takes about 5 minutes to complete. Which approach should a Developer take to increase the speed of completion?

  • AInstead of using Node.js, rewrite the Lambda function using Python.
  • BInstead of packaging the libraries in the ZIP file with the function, move them to a Lambda layer and use the layer with the function.
  • CAllocate the maximum available CPU units to the function.
  • DIncrease the available memory to the function.
  解答を表示
• #291

  A company developed a set of APIs that are being served through the Amazon API Gateway. The API calls need to be authenticated based on OpenID identity providers such as Amazon or Facebook. The APIs should allow access based on a custom authorization model. Which is the simplest and MOST secure design to use to build an authentication and authorization model for the APIs?

  • AUse Amazon Cognito user pools and a custom authorizer to authenticate and authorize users based on JSON Web Tokens.
  • BBuild a OpenID token broker with Amazon and Facebook. Users will authenticate with these identify providers and pass the JSON Web Token to the API to authenticate each API call.
  • CStore user credentials in Amazon DynamoDB and have the application retrieve temporary credentials from AWS STS. Make API calls by passing user credentials to the APIs for authentication and authorization.
  • DUse Amazon RDS to store user credentials and pass them to the APIs for authentications and authorization.
  解答を表示
• #292

  A Developer created a Lambda function for a web application backend. When testing the Lambda function from the AWS Lambda console, the Developer can see that the function is being executed, but there is no log data being generated in Amazon CloudWatch Logs, even after several minutes. What could cause this situation?

  • AThe Lambda function does not have any explicit log statements for the log data to send it to CloudWatch Logs.
  • BThe Lambda function is missing CloudWatch Logs as a source trigger to send log data.
  • CThe execution role for the Lambda function is missing permissions to write log data to the CloudWatch Logs.
  • DThe Lambda function is missing a target CloudWatch Log group.
  解答を表示
• #293

  An Amazon DynamoDB table uses a Global Secondary Index (GSI) to support read queries. The primary table is write-heavy, whereas the GSI is used for read operations. Looking at Amazon CloudWatch metrics, the Developer notices that write operations to the primary table are throttled frequently under heavy write activity. However, write capacity units to the primary table are available and not fully consumed. Why is the table being throttled?

  • AThe GSI write capacity units are underprovisioned.
  • BThere are not enough read capacity units on the primary table.
  • CAmazon DynamoDB Streams is not enabled on the table.
  • DA large write operation is being performed against another table.
  解答を表示
• #294

  A company wants to implement authentication for its new REST service using Amazon API Gateway. To authenticate the calls, each request must include HTTP headers with a client ID and user ID. These credentials must be compared to authentication data in an Amazon DynamoDB table. What MUST the company do to implement this authentication in API Gateway?

  • AImplement an AWS Lambda authorizer that references the DynamoDB authentication table.
  • BCreate a model that requires the credentials, then grant API Gateway access to the authentication table.
  • CModify the integration requests to require the credentials, then grant API Gateway access to the authentication table.
  • DImplement an Amazon Cognito authorizer that references the DynamoDB authentication table.
  解答を表示
• #295

  A company runs an e-commerce website that uses Amazon DynamoDB where pricing for items is dynamically updated in real time. At any given time, multiple updates may occur simultaneously for pricing information on a particular product. This is causing the original editor's changes to be overwritten without a proper review process. Which DynamoDB write option should be selected to prevent this overwriting?

  • AConcurrent writes.
  • BConditional writes.
  • CAtomic writes.
  • DBatch writes.
  解答を表示
• #296

  An ecommerce startup is preparing for an annual sales event. As the traffic to the company's application increases, the development team wants to be notified when the Amazon EC2 instance's CPU utilization exceeds 80%. Which solution will meet this requirement?

  • ACreate a custom Amazon CloudWatch alarm that sends a notification to an Amazon SNS topic when the CPU utilization exceeds 80%.
  • BCreate a custom AWS Cloud Trail alarm that sends a notification to an Amazon SNS topic when the CPU utilization exceeds 80%.
  • CCreate a cron job on the EC2 instance that executes the –describe-instance-information command on the host instance every 15 minutes and sends the results to an Amazon SNS topic.
  • DCreate an AWS Lambda function that queries the AWS CloudTrail logs for the CPUUtilization metric every 15 minutes and sends a notification to an Amazon SNS topic when the CPU utilization exceeds 80%.
  解答を表示
• #297

  An online retail company has deployed a serverless application with AWS Lambda, Amazon API Gateway, Amazon S3, and Amazon DynamoDB using AWS CloudFormation. The company rolled out a new release with major upgrades to the Lambda function and deployed the release to production. Subsequently, the application stopped working. Which solution should bring the application back up as quickly as possible?

  • ARedeploy the application on Amazon EC2 so the Lambda function can resolve dependencies.
  • BMigrate DynamoDB to Amazon RDS and redeploy the Lambda function.
  • CRoll back the Lambda function to the previous version.
  • DDeploy the latest Lambda function in a different Region.
  解答を表示
• #298

  A Developer is building a three-tier web application that should be able to handle a minimum of 5000 requests per minute. Requirements state that the web tier should be completely stateless while the application maintains session state for the users. How can session data be externalized, keeping latency at the LOWEST possible value?

  • ACreate an Amazon RDS instance, then implement session handling at the application level to leverage a database inside the RDS database instance for session data storage.
  • BImplement a shared file system solution across the underlying Amazon EC2 instances, then implement session handling at the application level to leverage the shared file system for session data storage.
  • CCreate an Amazon ElastiCache Memcached cluster, then implement session handling at the application level to leverage the cluster for session data storage.
  • DCreate an Amazon DynamoDB table, then implement session handling at the application level to leverage the table for session data storage.
  解答を表示
• #299

  A front-end web application is using Amazon Cognito user pools to handle the user authentication flow. A developer is integrating Amazon DynamoDB into the application using the AWS SDK for JavaScript. How would the developer securely call the API without exposing the access or secret keys?

  • AConfigure Amazon Cognito identity pools and exchange the JSON Web Token (JWT) for temporary credentials.
  • BRun the web application in an Amazon EC2 instance with the instance profile configured.
  • CHardcore the credentials, use Amazon S3 to host the web application, and enable server-side encryption.
  • DUse Amazon Cognito user pool JSON Web Tokens (JWITs) to access the DynamoDB APIs.
  解答を表示
• #300

  A Development team currently supports an application that uses an in-memory store to save accumulated game results. Individual results are stored in a database. As part of migrating to AWS, the team needs to use automatic scaling. The team knows this will yield inconsistent results. Where should the team store these accumulated game results to BEST allow for consistent results without impacting performance?

  • AAmazon S3.
  • BAmazon RDS.
  • CAmazon ElastiCache.
  • DAmazon Kinesis.
  解答を表示

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