AWS Certified Developer - Associate

• #181

  A company wants to migrate an imaging service to Amazon EC2 while following security best practices. The images are sourced and read from a non-public Amazon S3 bucket. What should a Developer do to meet these requirements?

  • ACreate an IAM user with read-only permissions for the S3 bucket. Temporarily store the user credentials in the Amazon EBS volume of the EC2 instance.
  • BCreate an IAM user with read-only permissions for the S3 bucket. Temporarily store the user credentials in the user data of the EC2 instance.
  • CCreate an EC2 service role with read-only permissions for the S3 bucket. Attach the role to the EC2 instance.
  • DCreate an S3 service role with read-only permissions for the S3 bucket. Attach the role to the EC2 instance.
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• #182

  A Developer must allow guest users without logins to access an Amazon Cognito-enabled site to view files stored within an Amazon S3 bucket. How should the Developer meet these requirements?

  • ACreate a blank user ID in a user pool, add to the user group, and grant access to AWS resources.
  • BCreate a new identity pool, enable access to unauthenticated identities, and grant access to AWS resources.
  • CCreate a new user pool, enable access to authenticated identifies, and grant access to AWS resources.
  • DCreate a new user pool, disable authentication access, and grant access to AWS resources.
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• #183

  A company caches session information for a web application in an Amazon DynamoDB table. The company wants an automated way to delete old items from the table. What is the simplest way to do this?

  • AWrite a script that deletes old records; schedule the scripts as a cron job on an Amazon EC2 instance.
  • BAdd an attribute with the expiration time; enable the Time To Live feature based on that attribute.
  • CEach day, create a new table to hold session data; delete the previous day's table.
  • DAdd an attribute with the expiration time; name the attribute ItemExpiration.
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• #184Choose 2

  A company is adding stored value (or gift card) capability to its highly popular casual gaming website. Users need to be able to trade this value for other users' items on the platform. This would require both users' records be updated as a single transaction, or both users' records to be completely rolled back. Which AWS database options can provide the transactional capability required for this new feature? (Choose TWO)

  • AAmazon DynamoDB with operations made with the ConsistentRead parameter set to true.
  • BAmazon ElastiCache for Memcached with operations made within a transaction block.
  • CAmazon Aurora MySQL with operations made within a transaction block.
  • DAmazon DynamoDB with reads and writes made using Transact operations.
  • EAmazon Redshift with operations made within a transaction block.
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• #185

  A Developer needs to create an application that supports Security Assertion Markup Language (SAML) and Facebook authentication. It must also allow access to AWS services, such as Amazon DynamoDB. Which AWS service or feature will meet these requirements with the LEAST amount of additional coding?

  • AAWS AppSync.
  • BAmazon Cognito identity pools.
  • CAmazon Cognito user pools.
  • DAmazon Lambda@Edge.
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• #186

  A Developer is creating a web application that requires authentication, but also needs to support guest access to provide users limited access without having to authenticate. What service can provide support for the application to allow guest access?

  • AIAM temporary credentials using AWS STS.
  • BAmazon Directory Service.
  • CAmazon Cognito with unauthenticated access enabled.
  • DIAM with SAML integration
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• #187

  A Developer has written code for an application and wants to share it with other Developers on the team to receive feedback. The shared application code needs to be stored long-term with multiple versions and batch change tracking. Which AWS service should the Developer use?

  • AAWS CodeBuild.
  • BAmazon S3.
  • CAWS CodeCommit.
  • DAWS Cloud9.
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• #188Choose 2

  A Developer is building a web application that uses Amazon API Gateway to expose an AWS Lambda function to process requests from clients. During testing, the Developer notices that the API Gateway times out even though the Lambda function finishes under the set time limit. Which of the following API Gateway metrics in Amazon CloudWatch can help the Developer troubleshoot the issue? (Choose TWO)

  • ACacheHitCount.
  • BIntegrationLatency.
  • CCacheMissCount.
  • DLatency.
  • ECount.
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• #189

  A company has an application that logs all information to Amazon S3. Whenever there is a new log file, an AWS Lambda function is invoked to process the log files. The code works, gathering all of the necessary information. However, when checking the Lambda function logs, duplicate entries with the same request ID are found. What is causing the duplicate entries?

  • AThe S3 bucket name was specified incorrectly.
  • BThe Lambda function failed, and the Lambda service retired the invocation with a delay.
  • CThere was an S3 outage, which caused duplicate entries of the sale log file.
  • DThe application stopped intermittently and then resumed.
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• #190

  A developer is using Amazon DynamoDB to store application data. The developer wants to further improve application performance by reducing response times for read and write operations. Which DynamoDB feature should be used to meet these requirements?

  • AAmazon DynamoDB Streams.
  • BAmazon DynamoDB Accelerator.
  • CAmazon DynamoDB global tables.
  • DAmazon DynamoDB transactions.
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• #191

  A Developer is writing an application that runs on Amazon EC2 instances in an Auto Scaling group. The application data is stored in an Amazon DynamoDB table and records are constantly updated by all instances. An instance sometimes retrieves old data. The Developer wants to correct this by making sure the reads are strongly consistent. How can the Developer accomplish this?

  • ASet ConsistentRead to true when calling GetItem.
  • BCreate a new DynamoDB Accelerator (DAX) table.
  • CSet Consistency to strong when calling UpdateTable.
  • DUse the GetShardIterator command.
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• #192

  A company is providing services to many downstream consumers. Each consumer may connect to one or more services. This has resulted in a complex architecture that is difficult to manage and does not scale well. The company needs a single interface to manage these services to consumers. Which AWS service should be used to refactor this architecture?

  • AAWS Lambda.
  • BAWS X-Ray.
  • CAmazon SQS.
  • DAmazon API Gateway.
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• #193

  An application contains two components: one component to handle HTTP requests, and another component to handle background processing tasks. Each component must scale independently. The developer wants to deploy this application using AWS Elastic Beanstalk. How should this application be deployed, based on these requirements?

  • ADeploy the application in a single Elastic Beanstalk environment.
  • BDeploy each component in a separate Elastic Beanstalk environment.
  • CUse multiple Elastic Beanstalk environments for the HTTP component but one environment for the background task component.
  • DUse multiple Elastic Beanstalk environments for the background task component but one environment for the HTTP component.
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• #194

  A Developer accesses AWS CodeCommit over SSH. The SSH keys configured to access AWS CodeCommit are tied to a user with the following permissions. The Developer needs to create/delete branches. Which specific IAM permissions need to be added, based on the principle of least privilege?

  • A"codecommit:CreateBranch" "codecommit:DeleteBranch".
  • B"codecommit:Put".
  • C"codecommit:Update".
  • D"codecommit:".
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• #195Choose 2

  Which of the following items are required to allow an application deployed on an EC2 instance to write data to a DynamoDB table? Assume that no security Keys are allowed to be stored on the EC2 instance. (Choose TWO)

  • ACreate an IAM User that allows write access to the DynamoDB table.
  • BAdd an IAM Role to a running EC2 instance.
  • CAdd an IAM User to a running EC2 Instance.
  • DLaunch an EC2 Instance with the IAM Role included in the launch configuration.
  • ECreate an IAM Role that allows write access to the DynamoDB table.
  • FLaunch an EC2 Instance with the IAM User included in the launch configuration.
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• #196

  A developer needs to deploy a new version to an AWS Elastic Beanstalk application. How can the developer accomplish this task?

  • AUpload and deploy the new application version in the Elastic Beanstalk console.
  • BUse the eb init CLI command to deploy a new version.
  • CTerminate the current Elastic Beanstalk environment and create a new one.
  • DModify the ebextensions folder to add a source option to services.
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• #197

  A company maintains an application responsible for processing several thousand external callbacks each day. The company's System administrators want to know how many callbacks are being received on a rolling basis, and they want this data available for 10 days. The company also wants the ability to issue automated alerts if the number of callbacks exceeds the defined thresholds. What is the MOST cost-effective way to address the need to track and alert on these statistics?

  • APush callback data to an Amazon RDS database that can be queried to show historical data and to alert on exceeded thresholds.
  • BPush callback data to AWS X-Ray and use AWS Lambda to query, display, and alert on exceeded thresholds.
  • CPush callback data to Amazon Kinesis Data Streams and invoke an AWS Lambda function that stores data in Amazon DynamoDB and sends the required alerts.
  • DPush callback data to Amazon CloudWatch as a custom metric and use the CloudWatch alerting mechanisms to alert System Administrators.
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• #198

  A company maintains a REST service using Amazon API Gateway and the API Gateway native API key validation. The company recently launched a new registration page, which allows users to sign up for the service. The registration page creates a new API key using CreateApiKey and sends the new key to the user. When the user attempts to call the API using this key, the user receives a 403 Forbidden error. Existing users are unaffected and can still call the API. What code updates will grant these new users access to the API?

  • AThe createDeployment method must be called so the API can be redeployed to include the newly created API key.
  • BThe updateAuthorizer method must be called to update the API's authorizer to include the newly created API key.
  • CThe importApiKeys method must be called to import all newly created API keys into the current stage of the API.
  • DThe createUsagePlanKey method must be called to associate the newly created API key with the correct usage plan.
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• #199

  A company is using Amazon RDS MySQL instances for its application database tier and Apache Tomcat servers for its web tier. Most of the database queries from web applications are repeated read requests. Use of which AWS service would increase in performance by adding in-memory store for repeated read queries?

  • AAmazon RDS Multi-AZ.
  • BAmazon SQS.
  • CAmazon ElastiCache.
  • DAmazon RDS read replica.
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• #200

  Queries to an Amazon DynamoDB table are consuming a large amount of read capacity. The table has a significant number of large attributes. The application does not need all of the attribute data. How can DynamoDB costs be minimized while maximizing application performance?

  • ABatch all the writes, and perform the write operations when no or few reads are being performed.
  • BCreate a global secondary index with a minimum set of projected attributes.
  • CImplement exponential backoffs in the application.
  • DLoad balance the reads to the table using an Application Load Balancer.
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