Amazon DVA-C02 Exam Practice Test Instant Access

Question 1

A developer is creating a simple proof-of-concept demo by using AWS CloudFormation and AWS Lambda functions The demo will use a CloudFormation template to deploy an existing Lambda function The Lambda function uses deployment packages and dependencies stored in Amazon S3 The developer defined anAWS Lambda Function resource in a CloudFormation template. The developer needs to add the S3 bucket to the CloudFormation template.

What should the developer do to meet these requirements with the LEAST development effort?

AAdd the function code in the CloudFormation template inline as the code property

BAdd the function code in the CloudFormation template as the ZipFile property.

CFind the S3 key for the Lambda function Add the S3 key as the ZipFile property in the CloudFormation template.

DAdd the relevant key and bucket to the S3Bucket and S3Key properties in the CloudFormation template

Answer : D

S3BucketandS3Key:These properties in a CloudFormationAWS::Lambda::Functionresource specify the location of the function's code in S3.

Least Development Effort:This solution minimizes code changes, relying on CloudFormation to reference the existing S3 deployment package.

AWS::Lambda::Function Resourcehttps://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html

Question 2

A developer is working on an ecommerce platform that communicates with several third-party payment processing APIs The third-party payment services do not provide a test environment.

The developer needs to validate the ecommerce platform's integration with the third-party payment processing APIs. The developer must test the API integration code without invoking the third-party payment processing APIs.

Which solution will meet these requirements'?

ASet up an Amazon API Gateway REST API with a gateway response configured for status code 200 Add response templates that contain sample responses captured from the real third-party API.

BSet up an AWS AppSync GraphQL API with a data source configured for each third-party API Specify an integration type of Mock Configure integration responses by using sample responses captured from the real third-party API.

CCreate an AWS Lambda function for each third-party API. Embed responses captured from the real third-party API. Configure Amazon Route 53 Resolver with an inbound endpoint for each Lambda function's Amazon Resource Name (ARN).

DSet up an Amazon API Gateway REST API for each third-party API Specify an integration request type of Mock Configure integration responses by using sample responses captured from the real third-party API

Answer : D

Mocking API Responses:API Gateway's Mock integration type enables simulating API behavior without invoking backend services.

Testing with Sample Data:Using captured responses from the real third-party API ensures realistic testing of the integration code.

Focus on Integration Logic:This solution allows the developer to isolate and test the application's interaction with the payment APIs, even without a test environment from the third-party providers.

Amazon API Gateway Mock Integrations:https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-mock-integration.html

Question 3

A company is using Amazon API Gateway to invoke a new AWS Lambda function The company has Lambda function versions in its PROD and DEV environments. In each environment, there is a Lambda function alias pointing to the corresponding Lambda function version API Gateway has one stage that is configured to point at the PROD alias

The company wants to configure API Gateway to enable the PROD and DEV Lambda function versions to be simultaneously and distinctly available

Which solution will meet these requirements?

AEnable a Lambda authorizer for the Lambda function alias in API Gateway Republish PROD and create a new stage for DEV Create API Gateway stage variables for the PROD and DEV stages. Point each stage variable to the PROD Lambda authorizer to the DEV Lambda authorizer.

BSet up a gateway response in API Gateway for the Lambda function alias. Republish PROD and create a new stage for DEV. Create gateway responses in API Gateway for PROD and DEV Lambda aliases

CUse an environment variable for the Lambda function alias in API Gateway. Republish PROD and create a new stage for development. Create API gateway environment variables for PROD and DEV stages. Point each stage variable to the PROD Lambda function alias to the DEV Lambda function alias.

DUse an API Gateway stage variable to configure the Lambda function alias Republish PROD and create a new stage for development Create API Gateway stage variables for PROD and DEV stages Point each stage variable to the PROD Lambda function alias and to the DEV Lambda function alias

Answer : D

API Gateway Stages:Stages in API Gateway represent distinct environments (like PROD and DEV) allowing different configurations.

Stage Variables:Stage variables store environment-specific information, including Lambda function aliases.

Ease of Management:This solution offers a straightforward way to manage different Lambda function versions across environments.

API Gateway Stages:https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-stages.html

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

Question 4

A company runs a payment application on Amazon EC2 instances behind an Application Load Balance The EC2 instances run in an Auto Scaling group across multiple Availability Zones The application needs to retrieve application secrets during the application startup and export the secrets as environment variables These secrets must be encrypted at rest and need to be rotated every month.

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

ASave the secrets in a text file and store the text file in Amazon S3 Provision a customer managed key Use the key for secret encryption in Amazon S3 Read the contents of the text file and read the export as environment variables Configure S3 Object Lambda to rotate the text file every month

BSave the secrets as strings in AWS Systems Manager Parameter Store and use the default AWS Key Management Service (AWS KMS) key Configure an Amazon EC2 user data script to retrieve the secrets during the startup and export as environment variables Configure an AWS Lambda function to rotate the secrets in Parameter Store every month.

CSave the secrets as base64 encoded environment variables in the application properties. Retrieve the secrets during the application startup. Reference the secrets in the application code. Write a script to rotate the secrets saved as environment variables.

DStore the secrets in AWS Secrets Manager Provision a new customer master key Use the key to encrypt the secrets Enable automatic rotation Configure an Amazon EC2 user data script to programmatically retrieve the secrets during the startup and export as environment variables

Answer : D

AWS Secrets Manager:Built for managing secrets, providing encryption, automatic rotation, and access control.

Customer Master Key (CMK):Provides an extra layer of control over encryption through AWS KMS.

Automatic Rotation:Enhances security by regularly changing the secret.

User Data Script:Allows secrets retrieval at instance startup and sets them as environment variables for seamless use within the application.

AWS Secrets Manager Documentation:https://docs.aws.amazon.com/secretsmanager/

AWS KMS Documentation:https://docs.aws.amazon.com/kms/

User Data for EC2 Instances:https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html

Question 5

A company has a social media application that receives large amounts of traffic User posts and interactions are continuously updated in an Amazon RDS database The data changes frequently, and the data types can be complex The application must serve read requests with minimal latency

The application's current architecture struggles to deliver these rapid data updates efficiently The company needs a solution to improve the application's performance.

Which solution will meet these requirements'?

AUse Amazon DynamoDB Accelerator (DAX) in front of the RDS database to provide a caching layer for the high volume of rapidly changing data

BSet up Amazon S3 Transfer Acceleration on the RDS database to enhance the speed of data transfer from the databases to the application.

CAdd an Amazon CloudFront distribution in front of the RDS database to provide a caching layer for the high volume of rapidly changing data

DCreate an Amazon ElastiCache for Redis cluster. Update the application code to use a write-through caching strategy and read the data from Redis.

Answer : D

Amazon ElastiCache for Redis:An in-memory data store known for extremely low latency, ideal for caching frequently accessed, complex data.

Write-Through Caching:Ensures that data is always consistent between the cache and the database. Writes go to both Redis and RDS.

Performance Gains:Redis handles reads with minimal latency, offloading the RDS database and improving the application's responsiveness.

Amazon ElastiCache for Redis Documentation:https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/

Caching Strategies:https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Strategies.html

Question 6

A developer is building a microservices-based application by using Python on AWS and several AWS services The developer must use AWS X-Ray The developer views the service map by using the console to view the service dependencies. During testing, the developer notices that some services are missing from the service map

What can the developer do to ensure that all services appear in the X-Ray service map?

AModify the X-Ray Python agent configuration in each service to increase the sampling rate

BInstrument the application by using the X-Ray SDK for Python. Install the X-Ray SDK for all the services that the application uses

CEnable X-Ray data aggregation in Amazon CloudWatch Logs for all the services that the application uses

DIncrease the X-Ray service map timeout value in the X-Ray console

Answer : B

AWS X-Ray SDK:The primary way to enable X-Ray tracing within applications. The SDK sends data about requests and subsegments to the X-Ray daemon for service map generation.

Instrumenting All Services:To visualize a complete microservice architecture on the service map, each relevant service must include the X-Ray SDK.

AWS X-Ray Documentation:https://docs.aws.amazon.com/xray/

X-Ray SDK for Python:https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-python.html

Question 7

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 EventBndge 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

Answer : A

SNS as a Fan-out Mechanism:SNS is perfect for triggering multiple actions from a single event (here, the image upload).

Workflow:

SNS Topic:Create an SNS topic that will be the central notification point.

S3 Event Notification:Configure the S3 bucket to send 'Object Created' event notifications to the SNS topic.

Lambda Subscription:Subscribe your thumbnail-creating Lambda function to the SNS topic.

Email Subscription:Subscribe an email address to the SNS topic to trigger notifications.

S3 Event Notifications:https://docs.aws.amazon.com/AmazonS3/latest/userguide/EventNotifications.html

SNS Subscriptions:https://docs.aws.amazon.com/sns/latest/dg/SNSMobilePush.html

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