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Exam 6: AWS Certified Developer Associate (DVA-C01)

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Question 61

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You attempt to store an object in the US-STANDARD region in Amazon S3, and receive a confirmation that it has been successfully stored. You then immediately make another API call and attempt to read this object. S3 tells you that the object does not exist. What could explain this behavior?

A) US-STANDARD uses eventual consistency and it can take time for an object to be readable in a bucket
B) Objects in Amazon S3 do not become visible until they are replicated to a second region.
C) US-STANDARD imposes a 1 second delay before new objects are readable.
D) You exceeded the bucket object limit, and once this limit is raised the object will be visible.

E) B) and D)
F) B) and C)

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Question 62

Multiple Choice

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Which of the following are valid SNS delivery transports? (Choose two.)

A) HTTP
B) UDP
C) SMS
D) DynamoDB
E) Named Pipes

F) B) and E)
G) A) and E)

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Question 63

Multiple Choice

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A Developer is writing a mobile application that allows users to view images from an S3 bucket. The users must be able to log in with their Amazon login, as well as Facebook® and/or Google® accounts. How can the Developer provide this authentication functionality?

A Developer needs temporary access to resources in a second account. What is the MOST secure way to achieve this?

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?

An application under development is required to store hundreds of video files. The data must be encrypted within the application prior to storage, with a unique key for each video file. How should the Developer code the application?

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?

An application deployed on AWS Elastic Beanstalk experiences increased error rates during deployments of new application versions, resulting in service degradation for users. The Development team believes that this is because of the reduction in capacity during the deployment steps. The team would like to change the deployment policy configuration of the environment to an option that maintains full capacity during deployment while using the existing instances. Which deployment policy will meet these requirements while using the existing instances?

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?

A developer is changing the configuration for a CPU-intensive AWS Lambda function that runs once an hour. The function usually takes 45 seconds to run, but sometimes the run time is up to 1 minute. The timeout parameter is set to 3 minutes, and all other parameters are set to default. The developer needs to optimize the run time of this function. Which solution will meet this requirement?

A gaming company is developing a mobile game app for iOS and Android platforms. This mobile game securely stores user data locally on the device. The company wants users to have the ability to use multiple devices for the game. The company needs to synchronize user data across devices without creating a backend application. Which AWS service or feature should the company use to meet these requirements?

An application stores images in an S3 bucket. Amazon S3 event notifications are used to trigger a Lambda function that resizes the images. Processing each image takes less than a second. How will AWS Lambda handle the additional traffic?

A company requires that AWS Lambda functions written by Developers log errors so System Administrators can more effectively troubleshoot issues. What should the Developers implement to meet this need?

A developer is migrating code to an AWS Lambda function that will an Amazon Aurora MySQL database. What is the MOST secure way to authenticate the function to the database?

An application overwrites an object in Amazon S3, and then immediately reads the same object. Why would the application sometimes retrieve the old version of the object?

A developer is building an application using an Amazon API Gateway REST API backed 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?

A company has implemented AWS CodeDeploy as part of its cloud native CI/CD stack. The company enables automatic rollbacks while deploying a new version of a popular web application from in-place to Amazon EC2. What occurs if the deployment of the new version fails due to code regression?

A Developer has created a new AWS IAM user that has s3:putObject permission to write to a specific Amazon S3 bucket. This S3 bucket uses server-side encryption with AWS KMS managed keys (SSE-KMS) as the default encryption. Using the access key and secret key of the IAM user, the application received an access denied error when calling the PutObject API. How can this issue be resolved?

A Developer executed a AWS CLI command and received the error shown below: What action should the Developer perform to make this error human-readable?

A company is migrating from a monolithic architecture to a microservices-based architecture. The Developers need to refactor the application so that the many microservices can asynchronously communicate with each other without impacting performance. Use of which managed AWS services will enable asynchronous message passing? (Choose two.)