AWS Certified Developer - Associate

• #81

  A company recently migrated its web, application and NoSQL database tiers to AWS. The company is using Auto Scaling to scale the web and application tiers. More than 95 percent of the Amazon DynamoDB requests are repeated read requests. How can the DynamoDB NoSQL tier be scaled up to cache these repeated requests?

  • AAmazon EMR.
  • BAmazon DynamoDB Accelerator.
  • CAmazon SQS.
  • DAmazon CloudFront.
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• #82

  After launching an instance that you intend to serve as a NAT (Network Address Translation) device in a public subnet you modify your route tables to have the NAT device be the target of internet bound traffic of your private subnet. When you try and make an outbound connection to the Internet from an instance in the private subnet, you are not successful. NAT device be the target of internet bound traffic of your private subnet. Which of the following steps could resolve the issue?

  • AAttaching a second Elastic Network interface (ENI) to the NAT instance, and placing it in the private subnet.
  • BAttaching a second Elastic Network Interface (ENI) to the instance in the private subnet, and placing it in the public subnet.
  • CDisabling the Source/Destination Check attribute on the NAT instance.
  • DAttaching an Elastic IP address to the instance in the private subnet.
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• #83

  An on-premises application is implemented using a Linux, Apache, MySQL and PHP (LAMP) stack. The Developer wants to run this application in AWS. Which of the following sets of AWS services can be used to run this stack?

  • AAmazon API Gateway, Amazon S3.
  • BAWS Lambda, Amazon DynamoDB.
  • CAmazon EC2, Amazon Aurora.
  • DAmazon Cognito, Amazon RDS.
  • EAmazon ECS, Amazon EBS.
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• #84

  An application running on Amazon EC2 opens connections to an Amazon RDS SQL Server database. The developer does not want to store the user name and password for the database in the code. The developer would also like to automatically rotate the credentials. What is the MOST secure way to store and access the database credentials?

  • ACreate an IAM role that has permissions to access the database. Attach the role to the EC2 instance.
  • BUse AWS Secrets Manager to store the credentials. Retrieve the credentials from Secrets Manager as needed.
  • CStore the credentials in an encrypted text file in an Amazon S3 bucket. Configure the EC2 instance's user data to download the credentials from Amazon S3 as the instance boots.
  • DStore the user name and password credentials directly in the source code. No further action is needed because the source code is stored in a private repository.
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• #85

  A Company runs continuous integration/continuous delivery (CI/CD) pipelines for its application on AWS CodePipeline. A Developer must write unit tests and run them as part of the pipelines before staging the artifacts for testing. How should the Developer incorporate unit tests as part of CI/CD pipelines?

  • ACreate a separate CodePipeline pipeline to run unit tests.
  • BUpdate the AWS CodeBuild specification to include a phase for running unit tests.
  • CInstall the AWS CodeDeploy agent on an Amazon EC2 instance to run unit tests.
  • DCreate a testing branch in AWS CodeCommit to run unit tests.
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• #86

  If an application is storing hourly log files from thousands of instances from a high traffic web site, which naming scheme would give optimal performance on S3?

  • ASequential.
  • BinstanceID_log-HH-DD-MM-YYYY.
  • CinstanceIDLog-YYYY-MM-DD-HH.
  • DHH-DD-MM-YYYY-log_instanceID.
  • EYYYY-MM-DD-HH-logInstanceID.
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• #87

  A developer must ensure that the IAM credentials used by an application in Amazon EC2 are not misused or compromised. What should the developer use to keep user credentials secure?

  • AEnvironment variables.
  • BAWS credentials file.
  • CInstance profile credentials.
  • DCommand line options.
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• #88

  A nightly batch job loads 1 million new records into a DynamoDB table. The records are only needed for one hour, and the table needs to be empty by the next night's batch job. Which is the MOST efficient and cost-effective method to provide an empty table?

  • AUse DeleteItem using a ConditionExpression.
  • BUse BatchWriteItem to empty all of the rows.
  • CWrite a recursive function that scans and calls out DeleteItem.
  • DCreate and then delete the table after the task has completed.
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• #89

  A developer is setting up Amazon API Gateway for their company's products. The API will be used by registered developers to query and update their environments. The company wants to limit the amount of requests end users can send for both cost and security reasons. Management wants to offer registered developers the option of buying larger packages that allow for more requests. How can the developer accomplish this with the LEAST amount of overhead management?

  • AEnable throttling for the API Gateway stage. Set a value for both the rate and burst capacity. If a registered user chooses a larger package, create a stage for them, adjust the values, and share the new URL with them.
  • BSet up Amazon CloudWatch API logging in API Gateway. Create a filter based on the user and requestTime fields and create an alarm on this filter. Write an AWS Lambda function to analyze the values and requester information, and respond accordingly. Set up the function as the target for the alarm. If a registered user chooses a larger package, update the Lambda code with the values.
  • CEnable Amazon CloudWatch metrics for the API Gateway stage. Set up CloudWatch alarms based off the Count metric and the ApiName, Method, Resource, and Stage dimensions to alerts when request rates pass the threshold. Set the alarm action to Deny. If a registered user chooses a larger package, create a user-specific alarm and adjust the values.
  • DSet up a default usage plan, specify values for the rate and burst capacity, and associate it with a stage. If a registered user chooses a larger package, create a custom plan with the appropriate values and associate the plan with the user.
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• #90

  A Developer has implemented a Lambda function that needs to add new customers to an RDS database that is expected to run hundreds of times per hour. The Lambda function is configured to use 512MB of RAM and is based on the following pseudo code. After testing the Lambda function, the Developer notices that the Lambda execution time is much longer than expected. What should the Developer do to improve performance?

  • AIncrease the amount of RAM allocated to the Lambda function, which will increase the number of threads the Lambda can use.
  • BIncrease the size of the RDS database to allow for an increased number of database connections each hour.
  • CMove the database connection and close statement out of the handler. Place the connection in the global space.
  • DReplace RDS wit Amazon DynamoDB to implement control over the number of writes per second.
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• #91Choose 3

  Which of the following statements about SWF are true? (Choose THREE)

  • ASWF tasks are assigned once and never duplicated.
  • BSWF requires an S3 bucket for workflow storage.
  • CSWF workflow executions can last up to a year.
  • DSWF triggers SNS notifications on task assignment.
  • ESWF uses deciders and workers to complete tasks.
  • FSWF requires at least 1 EC2 instance per domain.
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• #92

  When writing a Lambda function, what is the benefit of instantiating AWS clients outside the scope of the handler?

  • ALegibility and stylistic convention.
  • BTaking advantage of connection re-use.
  • CBetter error handling.
  • DCreating a new instance per invocation.
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• #93

  A Developer has an application that can upload tens of thousands of objects per second to Amazon S3 in parallel within a single AWS account. As part of new requirements, data stored in S3 must use server side encryption with AWS KMS (SSE-KMS). After creating this change, performance of the application is slower. Which of the following is MOST likely the cause of the application latency?

  • AAmazon S3 throttles the rate at which uploaded objects can be encrypted using Customer Master Keys.
  • BThe AWS KMS API calls limit is less than needed to achieve the desired performance.
  • CThe client encryption of the objects is using a poor algorithm.
  • DKMS requires that an alias be used to create an independent display name that can be mapped to a CM.
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• #94

  A company has a website that is developed in PHP and WordPress and is launched using AWS Elastic Beanstalk. There is a new version of the website that needs to be deployed in the Elastic Beanstalk environment. The company cannot tolerate having the website offline if an update fails. Deployments must have minimal impact and rollback as soon as possible. What deployment method should be used?

  • AAll at once.
  • BRolling.
  • CSnapshots.
  • DImmutable.
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• #95

  A Developer has created an S3 bucket s3://mycoolapp and has enabled server across logging that points to the folder s3://mycoolapp/logs. The Developer moved 100 KB of Cascading Style Sheets (CSS) documents to the folder s3://mycoolapp/css, and then stopped work. When the developer came back a few days later, the bucket was 50 GB. What is the MOST likely cause of this situation?

  • AThe CSS files were not compressed and S3 versioning was enabled.
  • BS3 replication was enabled on the bucket.
  • CLogging into the same bucket caused exponential log growth.
  • DAn S3 lifecycle policy has moved the entire CSS file to S3 Infrequent Access.
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• #96Choose 2

  A company needs to secure its existing website running behind an Elastic Load Balancer. The website's Amazon EC2 instances are CPU-constrained. What should be done to secure the website while not increasing the CPU load on the EC2 web servers? (Select TWO)

  • AConfigure an Elastic Load Balancer with SSL pass-through.
  • BConfigure SSL certificates on an Elastic Load Balancer.
  • CConfigure an Elastic Load Balancer with a Loadable Storage System.
  • DInstall SSL certificates on the EC2 instances.
  • EConfigure an Elastic Load Balancer with SSL termination.
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• #97

  A Developer registered an AWS Lambda function as a target for an Application Load Balancer (ALB) using a CLI command. However, the Lambda function is not being invoked when the client sends requests through the ALB. Why is the Lambda function not being invoked?

  • AA Lambda function cannot be registered as a target for an ALB.
  • BA Lambda function can be registered with an ALB using AWS Management Console only.
  • CThe permissions to invoke the Lambda function are missing.
  • DCross-zone is not enabled on the ALB.
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• #98

  An application has hundreds of users. Each user may use multiple devices to access the application. The Developer wants to assign unique identifiers to these users regardless of the device they use. Which of the following methods should be used to obtain unique identifiers?

  • ACreate a user table in Amazon DynamoDB as key-value pairs of users and their devices. Use these keys as unique identifiers.
  • BUse IAM-generated access key IDs for the users as the unique identifier, but do not store secret keys.
  • CImplement developer-authenticated identities by using Amazon Cognito, and get credentials for these identities.
  • DAssign IAM users and roles to the users. Use the unique IAM resource ID as the unique identifier.
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• #99

  A Developer is storing sensitive documents in Amazon S3 that will require encryption at rest. The encryption keys must be rotated annually, at least. What is the easiest way to achieve this?

  • AEncrypt the data before sending it to Amazon S3.
  • BImport a custom key into AWS KMS with annual rotation enabled.
  • CUse AWS KMS with automatic key rotation.
  • DExport a key from AWS KMS to encrypt the data.
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• #100

  A company has a legacy application that was migrated to a fleet of Amazon EC2 instances. The application stores data in a MySQL database that is currently installed on a single EC2 instance. The company has decided to migrate the database from the EC2 instance to MySQL on Amazon RDS. What should the Developer do to update the application to support data storage in Amazon RDS?

  • AUpdate the database connection parameters in the application to point to the new RDS instance.
  • BAdd a script to the EC2 instance that implements an AWS SDK for requesting database credentials.
  • CCreate a new EC2 instance with an IAM role that allows access to the new RDS database.
  • DCreate an AWS Lambda function that will route traffic, from the EC2 instance to the RDS database.
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