Free Amazon DVA-C02 Exam Questions

Question 1

An application that is deployed to Amazon EC2 is using Amazon DynamoDB. The app cation calls theDynamoDB REST API Periodically the application receives a ProvisionedThroughputExceededExceptionerror when the application writes to a DynamoDB table.Which solutions will mitigate this error MOST cost-effectively^ (Select TWO)

A : Modify the application code to perform exponential back off when the error is received.

B : Modify the application to use the AWS SDKs for DynamoDB.

C : Increase the read and write throughput of the DynamoDB table.

D : Create a DynamoDB Accelerator (DAX) cluster for the DynamoDB table.

E : Create a second DynamoDB table Distribute the reads and writes between the two tables.

Answer: A,B

Question 2

A developer is building a serverless application by using AWS Serverless Application Model (AWS SAM) onmultiple AWS Lambda functions.When the application is deployed, the developer wants to shift 10% of the traffic to the new deployment ofthe application for the first 10 minutes after deployment. If there are no issues, all traffic must switch over tothe new version.Which change to the AWS SAM template will meet these requirements?

A : Set the Deployment Preference Type to Canary10Percent10Minutes. Set the AutoPublishAlias propertyto the Lambda alias.

B : Set the Deployment Preference Type to LinearlOPercentEvery10Minutes. Set AutoPubIishAIiasproperty to the Lambda alias.

C : Set the Deployment Preference Type to CanaryIOPercentIOMinutes. Set the PreTraffic and PostTrafficproperties to the Lambda alias.

D : Set the Deployment Preference Type to LinearlOPercentEveryIOMinutes. Set PreTraffic and PostTraffic properties to the Lambda alias.

Answer: A

Question 3

A developer is working on an app for a company that uses an Amazon DynamoDB table named Orders tostore customer orders. The table uses OrderlD as the partition key and there is no sort key. The table containsmore than 100,000 records. The developer needs to add a functionality that will retrieve all Orders recordsthat contain an OrderSource attribute with the MobileApp value.Which solution will improve the user experience in the MOST efficient way?

A : Perform a Scan operation on the Orders table. Provide a QueryFilter condition to filter to only the itemswhere the OrderSource attribute is equal to the MobileApp value.

B : Create a local secondary index (LSI) with OrderSource as the partition key. Perform a Query operationby using MobileApp as the key.

C : Create a global secondary index (GSI) with OrderSource as the sort key. Perform a Query operation byusing MobileApp as the key.

D : Create a global secondary index (GSI) with OrderSource as the partition key. Perform a Queryoperation by using MobileApp as the key.

Answer: D

Question 4

A developer is creating a mobile app that calls a backend service by using an Amazon API Gateway RESTAPI. For integration testing during the development phase, the developer wants to simulate different backendresponses without invoking the backend service.Which solution will meet these requirements with the LEAST operational overhead?

A : Create an AWS Lambda function. Use API Gateway proxy integration to return constant HTTPresponses.

B : Create an Amazon EC2 instance that serves the backend REST API by using an AWS CloudFormationtemplate.

C : Customize the API Gateway stage to select a response type based on the request.

D : Use a request mapping template to select the mock integration response.

Answer: D

Question 5

A developer is creating an application that uses an AWS Lambda function to transform and load data from an Amazon S3 bucket. When the developer tests the application, the developer finds that some invocations of the Lambda function are slower than others. The developer needs to update the Lambda function to have predictable invocation durations that run with low latency. Any initialization activities, such as loading libraries and instantiating clients, must run during allocation time rather than during actual function invocations. Which combination of steps will meet these requirements? (Select TWO.)

A : Create a schedule group in Amazon EventBridge Scheduler to invoke the Lambda function.

B : Configure provisioned concurrency for the Lambda function to have the necessary number of execution environments.

C : Use the SLATEST version of the Lambda function.

D : Configure reserved concurrency for the Lambda function to have the necessary number of execution environments.

E : Deploy changes, and publish a new version of the Lambda function.

Answer: B,D