DVA-C02 practice questions 541–548

1. Question 541 · 548 in bank

   A developer is building an application that uses Amazon DynamoDB. The developer wants to retrieve multiple specific items from the database with a single API call. Which DynamoDB API call will meet these requirements with the MINIMUM impact on the database?

   • ABatchGetItem
   • BGetItem
   • CScan
   • DQuery

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   Answer: A

   Explanation

   tons of thanks. Looking for just a single item on the main table index? Use GetItem Looking for just a single item on a GSI? Use Query. Looking for multiple items with different partition key and sort key combinations at once? Use BatchGetItem Looking for multiple items that share the same partition key? Use Query

   Source: Adapted from community discussion — jipark

   References

   • AWS documentation

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2. Question 542 · 548 in bank

   A developer has written an application that runs on Amazon EC2 instances. The developer is adding functionality for the application to write objects to an Amazon S3 bucket. Which policy must the developer modify to allow the instances to write these objects?

   • AThe IAM policy that is attached to the EC2 instance profile role
   • BThe session policy that is applied to the EC2 instance role session
   • CThe AWS Key Management Service (AWS KMS) key policy that is attached to the EC2 instance profile role
   • DThe Amazon VPC endpoint policy

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   Answer: A

   References

   • repost.aws documentation

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3. Question 543 · 548 in bank

   A developer is leveraging a Border Gateway Protocol (BGP)-based AWS VPN connection to connect from on-premises to Amazon EC2 instances in the developer's account. The developer is able to access an EC2 instance in subnet A, but is unable to access an EC2 instance in subnet B in the same VPC. Which logs can the developer use to verify whether the traffic is reaching subnet B?

   • AVPN logs
   • BBGP logs
   • CVPC Flow Logs
   • DAWS CloudTrail logs

   Show answer

   Answer: C

   Explanation

   VPC Flow Logs capture information about the IP traffic going to and from network interfaces in a VPC. This includes traffic that traverses a VPN connection. VPC Flow Logs can be used to monitor and troubleshoot connectivity issues, including verifying whether traffic is reaching a particular subnet within the VPC.

   Source: Adapted from community discussion — Dushank

   References

   • AWS documentation

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4. Question 544 · 548 in bank

   A developer is creating a service that uses an Amazon S3 bucket for image uploads. The service will use an AWS Lambda function to create a thumbnail of each image. Each time an image is uploaded, the service needs to send an email notification and create the thumbnail. The developer needs to configure the image processing and email notifications setup. Which solution will meet these requirements?

   • ACreate an Amazon Simple Notification Service (Amazon SNS) topic. Configure S3 event notifications with a destination of the SNS topic. Subscribe the Lambda function to the SNS topic. Create an email notification subscription to the SNS topic.
   • BCreate an Amazon Simple Notification Service (Amazon SNS) topic. Configure S3 event notifications with a destination of the SNS topic. Subscribe the Lambda function to the SNS topic. Create an Amazon Simple Queue Service (Amazon SQS) queue. Subscribe the SQS queue to the SNS topic. Create an email notification subscription to the SQS queue.
   • CCreate an Amazon Simple Queue Service (Amazon SQS) queue. Configure S3 event notifications with a destination of the SQS queue. Subscribe the Lambda function to the SQS queue. Create an email notification subscription to the SQS queue.
   • DCreate an Amazon Simple Queue Service (Amazon SQS) queue. Send S3 event notifications to Amazon EventBridge. Create an EventBridge rule that runs the Lambda function when images are uploaded to the S3 bucket. Create an EventBridge rule that sends notifications to the SQS queue. Create an email notification subscription to the SQS queue.

   Show answer

   Answer: A

   Explanation

   This solution will allow the developer to receive notifications for each image uploaded to the S3 bucket, and also create a thumbnail using the Lambda function. The SNS topic will serve as a trigger for both the Lambda function and the email notification subscription. When an image is uploaded, S3 will send a notification to the SNS topic, which will trigger the Lambda function to create the thumbnail and also send an email notification to the specified email address.

   Source: Adapted from community discussion — MrTee

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5. Question 545 · 548 in bank

   A developer has designed an application to store incoming data as JSON files in Amazon S3 objects. Custom business logic in an AWS Lambda function then transforms the objects, and the Lambda function loads the data into an Amazon DynamoDB table. Recently, the workload has experienced sudden and significant changes in traffic. The flow of data to the DynamoDB table is becoming throttled. The developer needs to implement a solution to eliminate the throttling and load the data into the DynamoDB table more consistently. Which solution will meet these requirements?

   • ARefactor the Lambda function into two functions. Configure one function to transform the data and one function to load the data into the DynamoDB table. Create an Amazon Simple Queue Service (Amazon SQS) queue in between the functions to hold the items as messages and to invoke the second function.
   • BTurn on auto scaling for the DynamoDB table. Use Amazon CloudWatch to monitor the table's read and write capacity metrics and to track consumed capacity.
   • CCreate an alias for the Lambda function. Configure provisioned concurrency for the application to use.
   • DRefactor the Lambda function into two functions. Configure one function to store the data in the DynamoDB table. Configure the second function to process the data and update the items after the data is stored in DynamoDB. Create a DynamoDB stream to invoke the second function after the data is stored.

   Show answer

   Answer: A

   Explanation

   A. Refactor the Lambda function into two functions. Configure one function to transform the data and one function to load the data into the DynamoDB table. Create an Amazon Simple Queue Service (Amazon SQS) queue in between the functions to hold the items as messages and to invoke the second function. By breaking the Lambda function into two separate functions and using an SQS queue to hold the transformed data as messages, you can decouple the data transformation and loading processes. This allows for more controlled loading of data into the DynamoDB table and helps eliminate throttling issues.

   Source: Adapted from community discussion — ihebchorfi

   References

   • AWS documentation

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6. Question 546 · 548 in bank

   A developer is creating an AWS Lambda function in VPC mode. An Amazon S3 event will invoke the Lambda function when an object is uploaded into an S3 bucket. The Lambda function will process the object and produce some analytic results that will be recorded into a file. Each processed object will also generate a log entry that will be recorded into a file. Other Lambda functions, AWS services, and on-premises resources must have access to the result files and log file. Each log entry must also be appended to the same shared log file. The developer needs a solution that can share files and append results into an existing file. Which solution should the developer use to meet these requirements?

   • ACreate an Amazon Elastic File System (Amazon EFS) file system. Mount the EFS file system in Lambda. Store the result files and log file in the mount point. Append the log entries to the log file.
   • BCreate an Amazon Elastic Block Store (Amazon EBS) Multi-Attach enabled volume. Attach the EBS volume to all Lambda functions. Update the Lambda function code to download the log file, append the log entries, and upload the modified log file to Amazon EBS.
   • CCreate a reference to the /tmp local directory. Store the result files and log file by using the directory reference. Append the log entry to the log file.
   • DCreate a reference to the /opt storage directory. Store the result files and log file by using the directory reference. Append the log entry to the log file.

   Show answer

   Answer: A

   Explanation

   The requirement is to have a shared file system that allows for appending to files and can be accessed by multiple Lambda functions, AWS services, and on-premises resources. Amazon Elastic File System (Amazon EFS) is a good fit for these requirements. EFS provides a scalable and elastic NFS file system which can be mounted to multiple EC2 instances and Lambda functions at the same time, making it easier for these resources to share files. You can also append to existing files on an EFS file system, which meets the requirement for a shared log file that can have new entries appended to it.

   Source: Adapted from community discussion — Dushank

   References

   • AWS documentation
   • AWS documentation

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7. Question 547 · 548 in bank

   A company has an AWS Lambda function that processes incoming requests from an Amazon API Gateway API. The API calls the Lambda function by using a Lambda alias. A developer updated the Lambda function code to handle more details related to the incoming requests. The developer wants to deploy the new Lambda function for more testing by other developers with no impact to customers that use the API. Which solution will meet these requirements with the LEAST operational overhead?

   • ACreate a new version of the Lambda function. Create a new stage on API Gateway with integration to the new Lambda version. Use the new API Gateway stage to test the Lambda function.
   • BUpdate the existing Lambda alias used by API Gateway to a weighted alias. Add the new Lambda version as an additional Lambda function with a weight of 10%. Use the existing API Gateway stage for testing.
   • CCreate a new version of the Lambda function. Create and deploy a second Lambda function to filter incoming requests from API Gateway. If the filtering Lambda function detects a test request, the filtering Lambda function will invoke the new Lambda version of the code. For other requests, the filtering Lambda function will invoke the old Lambda version. Update the API Gateway API to use the filtering Lambda function.
   • DCreate a new version of the Lambda function. Create a new API Gateway API for testing purposes. Update the integration of the new API with the new Lambda version. Use the new API for testing.

   Show answer

   Answer: A

   Explanation

   Existing customers continue to use the current stage (e.g., prod), which is integrated with the old Lambda version. The new stage (e.g., test) can point to the new Lambda version without affecting the production stage. B) Eliminated - routing even 10% of traffic to the new Lambda version could cause issues for customers if the new version has any problems. C) Eliminated - This approach introduces an extra Lambda function to filter requests, increasing complexity. D) Eliminated - Creating a new API Gateway involves replicating configurations like authorizers, throttling, and endpoints. Maintaining two separate API Gateways adds long-term management overhead.

   Source: Adapted from community discussion — sumanshu

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8. Question 548 · 548 in bank

   A company’s developer needs to activate Amazon CloudWatch Logs Insights for an application’s AWS Lambda functions. The company uses an AWS Serverless Application Model (AWS SAM) template to deploy the application. The SAM template includes a logical resource that is named CloudWatchLogGroup. How should the developer modify the SAM template to activate CloudWatch Logs Insights for the Lambda functions?

   • AAdd an output named CloudWatchinsightRule that contains a value of the Amazon Resource Name (ARN) for the CloudWatchLogGroup resource.
   • BAdd a parameter named CloudWatchLogGroupNamePrefix that contains a value of the application name. Reference the new parameter in the CloudWatchLogGroup resource.
   • CFor each Lambda function, add the layer for the Lambda Insights extension and the CloudWatchLambdaInsightsExecutionRolePolicy AWS managed policy.
   • DFor each Lambda function, set Tracing mode to Active and add the CloudWatchLambdaInsightsExecutionRolePolicy AWS managed policy.

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   Answer: C

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DVA-C02 practice, question 541. 548 questions available.