Free Amazon DVA-C02 Exam Questions

Question 1

An application writes transactions to an Amazon DynamoDB table by using the PutItem operation. Eachtransaction has a unique transactionId. Sometimes duplicate transactions are received. The developer wants toensure that a duplicate PutItem does not overwrite an existing item. Duplicate transactions are rare.What is the MOST cost-effective solution?

A : Call GetItem before calling PutItem.

B : Enable TTL on the table.

C : Use a conditional put with attribute_exists(transactionId).

D : Use a conditional put with attribute_not_exists(transactionId).

Answer: D

Question 2

A developer is building an event-driven application that uses AWS Lambda functions and an Amazon SQSqueue to handle Amazon S3 events and to perform additional processing. A parsing Lambda functionimplements business logic to parse each S3 event. The parsing function sends events on to an SQS queue. Aprocessing Lambda function retrieves messages from the SQS queue and processes them.During an isolated test, the developer observes that both Lambda functions work as expected for mock testevents. However, when the test presents production S3 events to the functions, the developer observes that thenumber of messages in the SQS queue increases. The developer does not find any Amazon CloudWatch logsfor the processing Lambda function when the processing function is presented with production S3 events. Thedeveloper does find logs for test events.The developer must resolve these issues and ensure that the Lambda functions process production S3 eventscorrectly.Which solution will meet these requirements?

A : Configure the SQS queue as a trigger for the processing Lambda function.

B : Configure the SQS queue as a trigger for the parsing Lambda function.

C : Grant the processing Lambda function permissions to access the SQS queue.

D : Grant the processing Lambda function permissions to send logs to CloudWatch.

Answer: A

Question 3

A developer is using an AWS CloudFormation template to create a pipeline in AWS CodePipeline. Thetemplate creates an Amazon S3 bucket that the pipeline references in a source stage. The template also createsan AWS CodeBuild project for a build stage. The pipeline sends notifications to an Amazon SNS topic. Logsfor the CodeBuild project are stored in Amazon CloudWatch Logs.The company needs to ensure that the pipeline ' s artifacts are encrypted with an existing customer-managedAWS KMS key. The developer has granted the pipeline permissions to use the KMS key.Which additional step will meet these requirements?

A : Create an Amazon S3 gateway endpoint that the pipeline can access.

B : In the CloudFormation template, use the KMS key to encrypt the logs in CloudWatch Logs.

C : Apply an S3 bucket policy that ensures the pipeline sends only encrypted objects to the S3 bucket.

D : Configure the notification topic to use the existing KMS key to enable encryption with the existingKMS key.

Answer: C

Question 4

A developer needs to create a serverless application that uses an event-driven architecture.

How can the developer configure the application to automatically receive and process events?

A : eate an Amazon SQS queue and publish events to the queue. Configure an Amazon EC2 instance to poll the queue and consume the messages.

B : eate an Amazon SQS topic and an Amazon EC2 instance. Subscribe the instance to the SNS topic and submit events to the topic.

C : Create an Amazon SNS topic and an AWS Lambda function. Configure an HTTP endpoint on the Lambda function and subscribe the HTTP endpoint to the SNS topic. Submit events to the SNS topic.

D : eate an Amazon SNS topic and an AWS Lambda function. Subscribe the Lambda function to the SNS topic and submit events to the SNS topic.

Answer: D

Question 5

A developer supports an application that accesses data in an Amazon DynamoDB table. One of the itemattributes is expirationDate in the timestamp format. The application uses this attribute to find items, archivethem, and remove them from the table based on the timestamp valueThe application will be decommissioned soon, and the developer must find another way to implement thisfunctionality. The developer needs a solution that will require the least amount of code to write.Which solution will meet these requirements?

A : Enable TTL on the expirationDate attribute in the table. Create a DynamoDB stream. Create an AWSLambda function to process the deleted items. Create a DynamoDB trigger for the Lambda function.

B : Create two AWS Lambda functions one to delete the items and one to process the items Create aDynamoDB stream Use the Deleteltem API operation to delete the items based on the expirationDateattribute Use the GetRecords API operation to get the items from the DynamoDB stream and processthem

C : Create two AWS Lambda functions, one to delete the items and one to process the items. Create anAmazon EventBndge scheduled rule to invoke the Lambda Functions Use the Deleteltem API operationto delete the items based on the expirationDate attribute. Use the GetRecords API operation to get theitems from the DynamoDB table and process them.

D : Enable TTL on the expirationDate attribute in the table Specify an Amazon Simple Queue Service(Amazon SQS > dead-letter queue as the target to delete the items Create an AWS Lambda function toprocess the items

Answer: A