Amazon DVA-C02 Exam Practice Test Instant Access

Question 1

A developer is working on a web application that uses Amazon DynamoDB as its data store The application has two DynamoDB tables one table that is named artists and one table that is named songs The artists table has artistName as the partition key. The songs table has songName as the partition key and artistName as the sort key

The table usage patterns include the retrieval of multiple songs and artists in a single database operation from the webpage. The developer needs a way to retrieve this information with minimal network traffic and optimal application performance.

Which solution will meet these requirements'?

APerform a BatchGetltem operation that returns items from the two tables. Use the list of songName artistName keys for the songs table and the list of artistName key for the artists table.

BCreate a local secondary index (LSI) on the songs table that uses artistName as the partition key Perform a query operation for each artistName on the songs table that filters by the list of songName Perform a query operation for each artistName on the artists table

CPerform a BatchGetltem operation on the songs table that uses the songName/artistName keys. Perform a BatchGetltem operation on the artists table that uses artistName as the key.

DPerform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.

Answer : A

Scenario:Application needs to fetch songs and artists efficiently in a single operation.

BatchGetItem:This DynamoDB operation retrieves multiple items across different tables based on their primary keys in a single request.

Optimized for Request Batching:This approach reduces network traffic compared to performing multiple queries individually.

Data Modeling:Thesongstable is designed appropriately for this access pattern usingartistNameas the sort key.

Amazon DynamoDB BatchGetItem:https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.ht

Question 2

A developer is using an AWS Lambda function to generate avatars for profile pictures that are uploaded to an Amazon S3 bucket. The Lambda function is automatically invoked for profile pictures that are saved under the /original/ S3 prefix. The developer notices that some pictures cause the Lambda function to time out. The developer wants to implement a fallback mechanism by using another Lambda function that resizes the profile picture.

Which solution will meet these requirements with the LEAST development effort?

ASet the image resize Lambda function as a destination of the avatar generator Lambda function for the events that fail processing.

BCreate an Amazon Simple Queue Service (Amazon SQS) queue. Set the SQS queue as a destination with an on failure condition for the avatar generator Lambda function. Configure the image resize Lambda function to poll from the SQS queue.

CCreate an AWS Step Functions state machine that invokes the avatar generator Lambda function and uses the image resize Lambda function as a fallback. Create an Amazon EventBridge rule that matches events from the S3 bucket to invoke the state machine.

DCreate an Amazon Simple Notification Service (Amazon SNS) topic. Set the SNS topic as a destination with an on failure condition for the avatar generator Lambda function. Subscribe the image resize Lambda function to the SNS topic.

Answer : A

The solution that will meet the requirements with the least development effort is to set the image resize Lambda function as a destination of the avatar generator Lambda function for the events that fail processing. This way, the fallback mechanism is automatically triggered by the Lambda service without requiring any additional components or configuration. The other options involve creating and managing additional resources such as queues, topics, state machines, or rules, which would increase the complexity and cost of the solution.

Question 3

A company is using AWS CloudFormation to deploy a two-tier application. The application will use Amazon RDS as its backend database. The company wants a solution that will randomly generate the database password during deployment. The solution also must automatically rotate the database password without requiring changes to the application.

What is the MOST operationally efficient solution that meets these requirements'?

AUse an AWS Lambda function as a CloudFormation custom resource to generate and rotate the password.

BUse an AWS Systems Manager Parameter Store resource with the SecureString data type to generate and rotate the password.

CUse a cron daemon on the application s host to generate and rotate the password.

DUse an AWS Secrets Manager resource to generate and rotate the password.

Answer : D

This solution will meet the requirements by using AWS Secrets Manager, which is a service that helps protect secrets such as database credentials by encrypting them with AWS Key Management Service (AWS KMS) and enabling automatic rotation of secrets. The developer can use an AWS Secrets Manager resource in AWS CloudFormation template, which enables creating and managing secrets as part of a CloudFormation stack. The developer can use an AWS::SecretsManager::Secret resource type to generate and rotate the password for accessing RDS database during deployment. The developer can also specify a RotationSchedule property for the secret resource, which defines how often to rotate the secret and which Lambda function to use for rotation logic. Option A is not optimal because it will use an AWS Lambda function as a CloudFormation custom resource, which may introduce additional complexity and overhead for creating and managing a custom resource and implementing rotation logic. Option B is not optimal because it will use an AWS Systems Manager Parameter Store resource with the SecureString data type, which does not support automatic rotation of secrets. Option C is not optimal because it will use a cron daemon on the application's host to generate and rotate the password, which may incur more costs and require more maintenance for running and securing a host.

Question 4

A web application is using Amazon Kinesis Data Streams for clickstream data that may not be consumed for up to 12 hours.

How can the developer implement encryption at rest for data within the Kinesis Data Streams?

AEnable SSL connections to Kinesis.

BUse Amazon Kinesis Consumer Library.

CEncrypt the data once it is at rest with a Lambda function.

DEnable server-side encryption in Kinesis Data Streams.

Answer : B

Question 5

A developer creates an AWS Lambda function that is written in Jav

a. During testing, the Lambda function does not work how the developer expected. The developer wants to use tracing capabilities to troubleshoot the problem.

Which AWS service should the developer use to accomplish this goal?

AAWS Trusted Advisor

BAmazon CloudWatch

CAWS X-Ray

DAWS CloudTrail

Answer : C

Question 6

A company is building a serverless application on AWS. The application uses Amazon API Gateway and AWS Lambd

a. The company wants to deploy the application to its development, test, and production environments.

Which solution will meet these requirements with the LEAST development effort?

AUse API Gateway stage variables and create Lambda aliases to reference environment-specific resources.

BUse Amazon ECS to deploy the application to the environments.

CDuplicate the code for each environment. Deploy the code to a separate API Gateway stage.

DUse AWS Elastic Beanstalk to deploy the application to the environments.

Answer : A

Requirement Summary:

Deploy serverless application using:

API Gateway

AWS Lambda

Need dev, test, and prod environments

Want least development effort

Evaluate Options:

Option A: API Gateway stage variables + Lambda aliases

Most efficient and scalable

API Gateway supports stage variables (like env)

Lambda supports aliases (e.g., dev, test, prod)

You can configure each stage to point to a different alias of the same function version

Enables versioning, isolation, and low effort management

Option B: Use Amazon ECS

Overkill for a serverless setup

ECS is container-based, not serverless

Introduces unnecessary complexity

Option C: Duplicate code for each environment

High operational overhead and poor maintainability

Option D: Use Elastic Beanstalk

Not applicable: Elastic Beanstalk is for traditional app hosting, not optimal for Lambda + API Gateway

Lambda Aliases: https://docs.aws.amazon.com/lambda/latest/dg/configuration-aliases.html

API Gateway Stage Variables: https://docs.aws.amazon.com/apigateway/latest/developerguide/stage-variables.html

Question 7

A developer is deploying a new application to Amazon Elastic Container Service (Amazon ECS). The developer needs to securely store and retrieve different types of variables. These variables include authentication information for a remote API, the URL for the API, and credentials. The authentication information and API URL must be available to all current and future deployed versions of the application across development, testing, and production environments.

How should the developer retrieve the variables with the FEWEST application changes?

AUpdate the application to retrieve the variables from AWS Systems Manager Parameter Store. Use unique paths in Parameter Store for each variable in each environment. Store the credentials in AWS Secrets Manager in each environment.

BUpdate the application to retrieve the variables from AWS Key Management Service (AWS KMS). Store the API URL and credentials as unique keys for each environment.

CUpdate the application to retrieve the variables from an encrypted file that is stored with the application. Store the API URL and credentials in unique files for each environment.

DUpdate the application to retrieve the variables from each of the deployed environments. Define the authentication information and API URL in the ECS task definition as unique names during the deployment process.

Answer : A

AWS Systems Manager Parameter Store is a service that provides secure, hierarchical storage for configuration data management and secrets management. The developer can update the application to retrieve the variables from Parameter Store by using the AWS SDK or the AWS CLI. The developer can use unique paths in Parameter Store for each variable in each environment, such as /dev/api-url, /test/api-url, and /prod/api-url. The developer can also store the credentials in AWS Secrets Manager, which is integrated with Parameter Store and provides additional features such as automatic rotation and encryption.

[What Is AWS Systems Manager? - AWS Systems Manager]

[Parameter Store - AWS Systems Manager]

[What Is AWS Secrets Manager? - AWS Secrets Manager]

Amazon DVA-C02 AWS Certified Developer - Associate Exam Practice Test