AWS Certified Developer - Associate

• #361

  An application runs on multiple EC2 instances behind an ELB. Where is the session data best written so that it can be served reliably across multiple requests?

  • AWrite data to Amazon ElastiCache.
  • BWrite data to Amazon Elastic Block Store.
  • CWrite data to Amazon EC2 Instance Store.
  • DWrite data to the root filesystem.
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• #3622 つ選択

  A developer has built an application that inserts data into an Amazon DynamoDB table. The table is configured to use provisioned capacity. The application is deployed on a burstable nano Amazon EC2 Instance. The application logs show that the application has been failing because of a ProvisionedThroughputExceedException error. Which actions should the developer take to resolve this issue? (Choose two.)

  • AMove the application to a larger EC instance.
  • BIncrease the number or read capacity units (RCUs) that are provisioned for the DynamoDB table.
  • CReduce the frequency of requests to DynamoDB by implement ng exponential backoff.
  • DIncrease the frequency of requests to DynamoDB by decreasing the retry delay.
  • EChange the capacity mode of the DynamoDB table from provisioned to on-demand.
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• #363

  A Developer must re-implement the business logic for an order fulfilment system. The business logic has to make requests to multiple vendors to decide where to purchase an item. The whole process can take up to a week to complete. What is the MOST efficient and SIMPLEST way to implement a system that meets these requirements?

  • AUse AWS Step Functions to execute parallel Lambda functions, and join the results.
  • BCreate an AWS SQS for each vendor, poll the queue from a worker instance, and joint the results.
  • CUse AWS Lambda to asynchronously call a Lambda function for each vendor, and join the results.
  • DUse Amazon CloudWatch Events to orchestrate the Lambda functions.
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• #364

  A company is building a stock trading application that requires sub-millisecond latency in processing trading requests. Amazon DynamoDB is used to store all the trading data that is used to process each request. After load testing the application, the development team found that due to data retrieval times, the latency requirement is not satisfied. Because of sudden high spikes in the number of requests, DynamoDB read capacity has to be significantly over-provisioned to avoid throttling. What steps should be taken to meet latency requirements and reduce the cost of running the application?

  • AAdd Global Secondary Indexes for trading data.
  • BStore trading data in Amazon S3 and use Transfer Acceleration.
  • CAdd retries with exponential back-off for DynamoDB queries.
  • DUse DynamoDB Accelerator to cache trading data.
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• #365

  A company's ecommerce website is experiencing massive traffic spikes, which are causing performance problems in the company database. Users are reporting that accessing the website takes a long time. A developer wants to implement a caching layer using Amazon ElastiCache. The website is required to be responsive no matter which product a user views, and the updates to product information and prices must be strongly consistent. Which cache writing policy will satisfy these requirements?

  • AWrite to the cache directly and sync the backend at a later time.
  • BWrite to the backend first and wait for the cache to expire.
  • CWrite to the cache and the backend at the same time.
  • DWrite to the backend first and invalidate the cache.
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• #366

  An application running on EC2 instances is storing data in an S3 bucket. Security policy mandates that all data must be encrypted in transit. How can the Developer ensure that all traffic to the S3 bucket is encrypted?

  • AInstall certificates on the EC2 instances.
  • BCreate a bucket policy that allows traffic where SecureTransport is true.
  • CCreate an HTTPS redirect on the EC2 instances.
  • DCreate a bucket policy that denies traffic where SecureTransport is false.
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• #367

  A web application is using Amazon Kinesis Streams for clickstream data that may not be consumed for up to 12 hours. How can the Developer implement encryption at rest for data within the Kinesis Streams?

  • AEnable SSL connections to Kinesis.
  • BUse Amazon Kinesis Consumer Library.
  • CEncrypt the data once it is at rest with a Lambda function.
  • DEnable server-side encryption in Kinesis Streams.
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• #368

  A Development team decides to adopt a continuous integration/continuous delivery (CI/CD) process using AWS CodePipeline and AWS CodeCommit for a new application. However, management wants a person to review and approve the code before it is deployed to production. How can the Development team add a manual approver to the CI/CD pipeline?

  • AUse AWS SES to send an email to approvers when their action is required. Develop a simple application that allows approvers to accept or reject a build. Invoke an AWS Lambda function to advance the pipeline when a build is accepted.
  • BIf approved, add an approved tag when pushing changes to the CodeCommit repository. CodePipeline will proceed to build and deploy approved commits without interruption.
  • CAdd an approval step to CodeCommit. Commits will not be saved until approved.
  • DAdd an approval action to the pipeline. Configure the approval action to publish to an Amazon SNS topic when approval is required. The pipeline execution will stop and wait for an approval.
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• #369

  Company A has an S3 bucket containing premier content that they intend to make available to only paid subscribers of their website. The S3 bucket currently has default permissions of all objects being private to prevent inadvertent exposure of the premier content to non-paying website visitors. How can Company A provide only paid subscribers the ability to download a premier content file in the S3 bucket?

  • AApply a bucket policy that grants anonymous users to download the content from the S3 bucket.
  • BGenerate a pre-signed object URL for the premier content file when a paid subscriber requests a download.
  • CAdd a bucket policy that requires Multi-Factor Authentication for requests to access the S3 bucket objects.
  • DEnable server side encryption on the S3 bucket for data protection against the non-paying website visitors.
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• #370

  A company uses a third-party tool to build, bundle, and package rts applications on-premises and store them locally. The company uses Amazon EC2 instances to run its front-end applications. How can an application be deployed from the source control system onto the EC2 instances?

  • AUse AWS CodeDeploy and point it to the local storage to directly deploy a bundle m a zip. tar. or tar.gz format.
  • BUpload the bundle to an Amazon S3 bucket and specify the S3 location when doing a deployment using AWS CodeDeploy.
  • CCreate a repository using AWS CodeCommit to automatically trigger a deployment to the EC2 instances.
  • DUse AWS CodeBuild to automatically deploy the latest build to the latest EC2 instances.
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• #371

  An existing serverless application processes uploaded image files. The process currently uses a single Lambda function that takes an image file, performs the processing, and stores the file in Amazon S3. Users of the application now require thumbnail generation of the images. Users want to avoid any impact to the time it takes to perform the image uploads. How can thumbnail generation be added to the application, meeting user requirements while minimizing changes to existing code?

  • AChange the existing Lambda function handling the uploads to create thumbnails at the time of upload. Have the function store both the image and thumbnail in Amazon S3.
  • BCreate a second Lambda function that handles thumbnail generation and storage. Change the existing Lambda function to invoke it asynchronously.
  • CCreate an S3 event notification with a Lambda function destination. Create a new Lambda function to generate and store thumbnails.
  • DCreate an S3 event notification to an SQS Queue. Create a scheduled Lambda function that processes the queue, and generates and stores thumbnails.
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• #372

  A company's fleet of Amazon EC2 instances receives data from millions of users through an API. The servers batch the data, add an object for each user, and upload the objects to an S3 bucket to ensure high access rates. The object attributes are Customer ID, Server ID, TS-Server (TimeStamp and Server ID), the size of the object, and a timestamp. A Developer wants to find all the objects for a given user collected during a specified time range. After creating an S3 object created event, how can the Developer achieve this requirement?

  • AExecute an AWS Lambda function in response to the S3 object creation events that creates an Amazon DynamoDB record for every object with the Customer ID as the partition key and the Server ID as the sort key. Retrieve all the records using the Customer ID and Server ID attributes.
  • BExecute an AWS Lambda function in response to the S3 object creation events that creates an Amazon Redshift record for every object with the Customer ID as the partition key and TS-Server as the sort key. Retrieve all the records using the Customer ID and TS-Server attributes.
  • CExecute an AWS Lambda function in response to the S3 object creation events that creates an Amazon DynamoDB record for every object with the Customer ID as the partition key and TS-Server as the sort key. Retrieve all the records using the Customer ID and TS-Server attributes.
  • DExecute an AWS Lambda function in response to the S3 object creation events that creates an Amazon Redshift record for every object with the Customer ID as the partition key and the Server ID as the sort key. Retrieve all the records using the Customer ID and Server ID attributes.
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• #373

  A developer needs to manage AWS infrastructure as code and must be able to deploy multiple identical copies of the infrastructure, stage changes, and revert to previous versions. Which approach addresses these requirements?

  • AUse cost allocation reports and AWS OpsWorks to deploy and manage the infrastructure.
  • BUse Amazon CloudWatch metrics and alerts along with resource tagging to deploy and manage the infrastructure.
  • CUse AWS Elastic Beanstalk and AWS CodeCommit to deploy and manage the infrastructure.
  • DUse AWS CloudFormation and AWS CodeCommit to deploy and manage the infrastructure.
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• #374

  A developer is refactoring a monolithic application. The application takes a POST request and performs several operations. Some of the operations are in parallel while others run sequentially. These operations have been refactored into individual AWS Lambda functions. The POST request will be processed by Amazon API Gateway. How should the developer invoke the Lambda functions in the same sequence using API Gateway?

  • AUse Amazon SQS to invoke the Lambda functions.
  • BUse an AWS Step Functions activity to run the Lambda functions.
  • CUse Amazon SNS to trigger the Lambda functions.
  • DUse an AWS Step Functions state machine to orchestrate the Lambda functions.
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• #3752 つ選択

  A Development team wants to immediately build and deploy an application whenever there is a change to the source code. Which approaches could be used to trigger the deployment? (Choose TWO)

  • AStore the source code in an Amazon S3 bucket. Configure AWS CodePipeline to start whenever a file in the bucket changes.
  • BStore the source code in an encrypted Amazon EBS volume. Configure AWS CodePipeline to start whenever a file in the volume changes.
  • CStore the source code in an AWS CodeCommit repository. Configure AWS CodePipeline to start whenever a change is committed to the repository.
  • DStore the source code in an Amazon S3 bucket. Configure AWS CodePipeline to start every 15 minutes.
  • EStore the source code in an Amazon EC2 instance's ephemeral storage. Configure the instance to start AWS CodePipeline whenever there are changes to the source code.
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• #376

  You run an ad-supported photo sharing website using S3 to serve photos to visitors of your site. At some point you find out that other sites have been linking to the photos on your site, causing loss to your business. What is an effective method to mitigate this?

  • AStore photos on an EBS volume of the web server.
  • BRemove public read access and use signed URLs with expiry dates.
  • CUse CloudFront distributions for static content.
  • DBlock the IPs of the offending websites in Security Groups.
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• #377

  A developer is creating an AWS Lambda function that generates a new file each time it runs. Each new file must be checked into an AWS CodeCommit repository hosted in the same AWS account. How should the developer accomplish this?

  • AWhen the Lambda function starts, use the Git CLI to clone the repository. Check the new file into the cloned repository and push the change.
  • BAfter the new file is created in Lambda, use cURL to invoke the CodeCommit API. Send the file to the repository.
  • CUse an AWS SDK to instantiate a CodeCommit client. Invoke the put_file method to add the file to the repository.
  • DUpload the new to an Amazon S3 bucket. Create an AWS Step Function to accept S3 events. In the Step Function, add the new file to the repository.
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• #378

  A Development team has pushed out 10 applications running on several Amazon EC2 instances. The Operations team is asking for a graphical representation of one key performance metric for each application. These metrics should be available on one screen for easy monitoring. Which steps should the Developer take to accomplish this using Amazon CloudWatch?

  • ACreate a custom namespace with a unique metric name for each application.
  • BCreate a custom dimension with a unique metric name for each application.
  • CCreate a custom event with a unique metric name for each application.
  • DCreate a custom alarm with a unique metric name for each application.
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• #379

  A developer is building an application using an Amazon API Gateway REST API backend by an AWS Lambda function that interacts with an Amazon DynamoDB table. During testing, the developer observes high latency when making requests to the API. How can the developer evaluate the end-to-end latency and identify performance bottlenecks?

  • AEnable AWS CloudTrail logging and use the logs to map each latency and bottleneck.
  • BEnable and configure AWS X-Ray tracing on API Gateway and the Lambda function. Use X-Ray to trace and analyze user requests.
  • CEnable Amazon CloudWatch Logs for the Lambda function. Enable execution logs for API Gateway to view and analyze user request logs.
  • DEnable VPC Flow Logs to capture and analyze network traffic within the VPC.
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• #3802 つ選択

  A startup s photo-sharing site is deployed in a VPC. An ELB distributes web traffic across two subnets. ELB session stickiness is configured to use the AWS-generated session cookie, with a session TTL of 5 minutes. The webserver Auto Scaling Group is configured as: min-size=4, max-size=4, The startups preparing for a public launch, by running load-testing software installed on a single EC2 instance running in us-west-2. After 60 minutes of load-testing, the webserver logs show. Which recommendations can help ensure load-testing HTTP requests are evenly distributed across the four webservers? (Choose TWO)

  • ALaunch and run the load-tester EC2 instance from us-east-1 instead.
  • BRe-configure the load-testing software to re-resolve DNS for each web request.
  • CUse a 3rd-party load-testing service which offers globally-distributed test clients.
  • DConfigure ELB and Auto Scaling to distribute across us-west-2a and us-west-2c.
  • EConfigure ELB session stickiness to use the app-specific session cookie.
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