DVA-C02 practice questions 141–150

1. Question 141 · 548 in bank

   Given the following AWS CloudFormation template:

   

   What is the MOST efficient way to reference the new Amazon S3 bucket from another AWS CloudFormation template?

   • AAdd an Export declaration to the Outputs section of the original template and use ImportValue in other templates.
   • BAdd Exported: true to the Content.Bucket in the original template and use ImportResource in other templates.
   • CCreate a custom AWS CloudFormation resource that gets the bucket name from the ContentBucket resource of the first stack.
   • DUse Fn::Include to include the existing template in other templates and use the ContentBucket resource directly.

   Show answer

   Answer: A

   Explanation

   By adding an Export declaration to the Outputs section of the original CloudFormation template, you can make the bucket name available for other templates to import and use. This allows you to reference the bucket name directly in other templates without the need for additional resources or custom logic.

   Source: Adapted from community discussion — papason

   References

   • AWS documentation

   Next question

2. Question 142 · 548 in bank

   Select 2

   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 ProvisionedThroughputExceededException error. Which actions should the developer take to resolve this issue? (Choose two.)

   • AMove the application to a larger EC2 instance.
   • BIncrease the number of read capacity units (RCUs) that are provisioned for the DynamoDB table.
   • CReduce the frequency of requests to DynamoDB by implementing 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.

   Show answer

   Answer: CE

   Explanation

   C. Reduce the frequency of requests to DynamoDB by implementing exponential backoff. E. Change the capacity mode of the DynamoDB table from provisioned to on-demand.

   Source: Adapted from community discussion — bhanupriya07

   References

   • AWS documentation
   • AWS documentation

   Next question

3. Question 143 · 548 in bank

   A company is hosting a workshop for external users and wants to share the reference documents with the external users for 7 days. The company stores the reference documents in an Amazon S3 bucket that the company owns. What is the MOST secure way to share the documents with the external users?

   • AUse S3 presigned URLs to share the documents with the external users. Set an expiration time of 7 days.
   • BMove the documents to an Amazon WorkDocs folder. Share the links of the WorkDocs folder with the external users.
   • CCreate temporary IAM users that have read-only access to the S3 bucket. Share the access keys with the external users. Expire the credentials after 7 days.
   • DCreate a role that has read-only access to the S3 bucket. Share the Amazon Resource Name (ARN) of this role with the external users.

   Show answer

   Answer: A

   Explanation

   Presigned URLs are a secure way to provide temporary access to specific objects in an S3 bucket. By generating a presigned URL, you grant time-limited access to the files without having to alter the underlying permissions of the S3 bucket or objects. You can set an expiration time for the URL, ensuring that access to the document is automatically revoked after 7 days. This method is straightforward and does not require the management of user identities or permissions beyond the scope of the shared objects.

   Source: Adapted from community discussion — SerialiDr

   Next question

4. Question 144 · 548 in bank

   A developer is planning to use an Amazon API Gateway and AWS Lambda to provide a REST API. The developer will have three distinct environments to manage: development, test, and production. How should the application be deployed while minimizing the number of resources to manage?

   • ACreate a separate API Gateway and separate Lambda function for each environment in the same Region.
   • BAssign a Region for each environment and deploy API Gateway and Lambda to each Region.
   • CCreate one API Gateway with multiple stages with one Lambda function with multiple aliases.
   • DCreate one API Gateway and one Lambda function, and use a REST parameter to identify the environment.

   Show answer

   Answer: C

   Explanation

   This approach involves creating a single API Gateway and a single Lambda function. Within the API Gateway, you can create multiple stages, each corresponding to a different environment (development, test, production). Similarly, for the Lambda function, you can create multiple aliases, each pointing to a different version of the Lambda function that corresponds to each environment. This setup allows for clear separation of environments within the same set of resources. It simplifies deployment and management by reducing the number of resources and also provides an easy way to promote changes from one environment to another.

   Source: Adapted from community discussion — SerialiDr

   Next question

5. Question 145 · 548 in bank

   A company has a multi-node Windows legacy application that runs on premises. The application uses a network shared folder as a centralized configuration repository to store configuration files in .xml format. The company is migrating the application to Amazon EC2 instances. As part of the migration to AWS, a developer must identify a solution that provides high availability for the repository. Which solution will meet this requirement MOST cost-effectively?

   • AMount an Amazon Elastic Block Store (Amazon EBS) volume onto one of the EC2 instances. Deploy a file system on the EBS volume. Use the host operating system to share a folder. Update the application code to read and write configuration files from the shared folder.
   • BDeploy a micro EC2 instance with an instance store volume. Use the host operating system to share a folder. Update the application code to read and write configuration files from the shared folder.
   • CCreate an Amazon S3 bucket to host the repository. Migrate the existing .xml files to the S3 bucket. Update the application code to use the AWS SDK to read and write configuration files from Amazon S3.
   • DCreate an Amazon S3 bucket to host the repository. Migrate the existing .xml files to the S3 bucket. Mount the S3 bucket to the EC2 instances as a local volume. Update the application code to read and write configuration files from the disk.

   Show answer

   Answer: C

   Explanation

   c Option C is the most cost-effective solution to provide high availability for the centralized configuration repository. Amazon S3 provides a highly durable and available object storage service. S3 stores objects redundantly across multiple devices and multiple facilities within a region, making it highly available. The developer can migrate the existing .xml files to an S3 bucket and update the application code to use the AWS SDK to read and write configuration files from Amazon S3. Option A and B are not the best solutions as they require the developer to use the host operating system to share a folder, which can lead to a single point of failure. Option D is not a recommended solution as it is not a direct way of accessing an S3 bucket. While it is possible to use third-party tools to mount an S3 bucket as a local disk, it can lead to performance issues and additional complexity.

   Source: Adapted from community discussion — Bibay

   References

   • AWS documentation
   • AWS documentation
   • AWS documentation
   • AWS documentation
   • AWS documentation

   Next question

6. Question 146 · 548 in bank

   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.

   Show answer

   Answer: C

   Explanation

   To allow an ALB to invoke a Lambda function, you need to grant the ALB permission to invoke the Lambda. This is typically done by adding a resource-based policy to the Lambda function, granting invoke permission to the ALB. If this permission is not set, the ALB will not be able to trigger the Lambda function in response to incoming requests.

   Source: Adapted from community discussion — SerialiDr

   References

   • AWS documentation

   Next question

7. Question 147 · 548 in bank

   A developer is creating an AWS Lambda function that will connect to an Amazon RDS for MySQL instance. The developer wants to store the database credentials. The database credentials need to be encrypted and the database password needs to be automatically rotated. Which solution will meet these requirements?

   • AStore the database credentials as environment variables for the Lambda function. Set the environment variables to rotate automatically.
   • BStore the database credentials in AWS Secrets Manager. Set up managed rotation on the database credentials.
   • CStore the database credentials in AWS Systems Manager Parameter Store as secure string parameters. Set up managed rotation on the parameters.
   • DStore the database credentials in the X-Amz-Security-Token parameter. Set up managed rotation on the parameter.

   Show answer

   Answer: B

   Next question

8. Question 148 · 548 in bank

   A developer wants to reduce risk when deploying a new version of an existing AWS Lambda function. To test the Lambda function, the developer needs to split the traffic between the existing version and the new version of the Lambda function. Which solution will meet these requirements?

   • AConfigure a weighted routing policy in Amazon Route 53. Associate the versions of the Lambda function with the weighted routing policy.
   • BCreate a function alias. Configure the alias to split the traffic between the two versions of the Lambda function.
   • CCreate an Application Load Balancer (ALB) that uses the Lambda function as a target. Configure the ALB to split the traffic between the two versions of the Lambda function.
   • DCreate the new version of the Lambda function as a Lambda layer on the existing version. Configure the function to split the traffic between the two layers.

   Show answer

   Answer: B

   Explanation

   This approach is more efficient and cost-effective than other options such as configuring a weighted routing policy in Amazon Route 53, creating an Application Load Balancer (ALB) that uses the Lambda function as a target, or creating the new version of the Lambda function as a Lambda layer on the existing version

   Source: Adapted from community discussion — Snape

   References

   • AWS documentation

   Next question

9. Question 149 · 548 in bank

   Select 2

   A developer has created a large AWS Lambda function. Deployment of the function is failing because of an InvalidParameterValueException error. The error message indicates that the unzipped size of the function exceeds the maximum supported value. Which actions can the developer take to resolve this error? (Choose two.)

   • ASubmit a quota increase request to AWS Support to increase the function to the required size.
   • BUse a compression algorithm that is more efficient than ZIP.
   • CBreak up the function into multiple smaller functions.
   • DZip the .zip file twice to compress the file more.
   • EMove common libraries, function dependencies, and custom runtimes into Lambda layers.

   Show answer

   Answer: CE

   Explanation

   C. Break up the function into multiple smaller functions. If the size of the Lambda function is too large, breaking it into smaller, more modular functions can help. Each function can be responsible for a specific part of the application's logic. This approach not only helps with deployment but also aligns with microservices best practices, potentially improving the maintainability and scalability of the application. E. Move common libraries, function dependencies, and custom runtimes into Lambda layers. Lambda layers are a way to manage and share common components across multiple Lambda functions. By moving libraries, dependencies, and runtimes into layers, you reduce the size of the Lambda function's deployment package. Layers can be shared across multiple functions, leading to more efficient use of storage and easier management of common code.

   Source: Adapted from community discussion — SerialiDr

   References

   • AWS documentation

   Next question

10. Question 150 · 548 in bank

    A developer is troubleshooting an application in an integration environment. In the application, an Amazon Simple Queue Service (Amazon SQS) queue consumes messages and then an AWS Lambda function processes the messages. The Lambda function transforms the messages and makes an API call to a third-party service. There has been an increase in application usage. The third-party API frequently returns an HTTP 429 Too Many Requests error message. The error message prevents a significant number of messages from being processed successfully. How can the developer resolve this issue?

    • AIncrease the SQS event source’s batch size setting.
    • BConfigure provisioned concurrency for the Lambda function based on the third-party API’s documented rate limits.
    • CIncrease the retry attempts and maximum event age in the Lambda function’s asynchronous configuration.
    • DConfigure maximum concurrency on the SQS event source based on the third-party service’s documented rate limits.

    Show answer

    Answer: D

    Explanation

    By setting the maximum concurrency on the SQS event source, the developer can control the number of Lambda functions executing concurrently. This approach ensures that the rate of API calls does not exceed the rate limits set by the third-party service, thereby reducing the likelihood of encountering the HTTP 429 error. Adjusting the concurrency settings allows for better control of the throughput to match the API’s capacity.

    Source: Adapted from community discussion — SerialiDr

    References

    • AWS documentation

    Next question

Keyboard:J Kmove between questionsA–Dselect an answerRshow or hide the answer← →change page

DVA-C02 practice, question 141. 548 questions available.