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【General】 Exam DVA-C02 Lab Questions Free PDF | Efficient Latest DVA-C02 Test Cost: AWS Ce

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Amazon AWS Certified Developer - Associate Sample Questions (Q97-Q102):NEW QUESTION # 97
A developer registered an AWS Lambda function as a target for an Application Load Balancer (ALB) using a CLI command. However, the Lambda function is not being invoked when the client sends requests through the ALB.
Why is the Lambda function not being invoked?
  • A. The permissions to invoke the Lambda function are missing.
  • B. A Lambda function cannot be registered as a target for an ALB.
  • C. A Lambda function can be registered with an ALB using AWS Management Console only.
  • D. Cross-zone is not enabled on the ALB.
Answer: A
Explanation:
An Application Load Balancer can invoke Lambda functions as targets, but ALB must be explicitly granted permission to invoke the function. This is done by adding a resource-based permission to the Lambda function policy that allows the Elastic Load Balancing service principal to call lambda:InvokeFunction, typically scoped to the specific target group ARN.
If the developer registers the function as a target but does not add the required permission, the ALB will not be able to invoke the function when requests arrive. This is a common integration oversight: the target registration succeeds, but invocation fails because Lambda denies the call.
Option A is incorrect because ALB does support Lambda targets.
Option B is incorrect because Lambda targets can be configured through the console, CLI, or APIs.
Option D is unrelated: cross-zone load balancing affects distribution of traffic across AZs for instance/IP targets, not whether Lambda invocation is authorized.

NEW QUESTION # 98
A developer is creating a serverless application that uses an AWS Lambda function The developer will use AWS CloudFormation to deploy the application The application will write logs to Amazon CloudWatch Logs The developer has created a log group in a CloudFormation template for the application to use The developer needs to modify the CloudFormation template to make the name of the log group available to the application at runtime Which solution will meet this requirement?
  • A. Use the AWS:lnclude transform in CloudFormation to provide the log group's name to the application
  • B. Use the CloudFormation template's Mappings section to specify the log group's name for the application.
  • C. Pass the log group's Amazon Resource Name (ARN) as an environment variable to the Lambda function
  • D. Pass the log group's name to the application in the user data section of the CloudFormation template.
Answer: C
Explanation:
CloudFormation and Lambda Environment Variables:
CloudFormation is an excellent tool to manage infrastructure as code, including the log group resource.
Lambda functions can access environment variables at runtime, making them a suitable way to pass configuration information like the log group ARN.
CloudFormation Template Modification:
In your CloudFormation template, define the log group resource.
In the Lambda function resource, add an Environment section:
YAML
Environment:
Variables:
LOG_GROUP_ARN: !Ref LogGroupResourceName
Use code with caution.
content_copy
The !Ref intrinsic function retrieves the log group's ARN, which CloudFormation generates during stack creation.
Using the ARN in Your Lambda Function:
Within your Lambda code, access the LOG_GROUP_ARN environment variable.
Configure your logging library (e.g., Python's logging module) to send logs to the specified log group.
Reference:
AWS Lambda Environment Variables: https://docs.aws.amazon.com/lamb ... ration-envvars.html CloudFormation !Ref Intrinsic Function: https://docs.aws.amazon.com/AWSC ... -reference-ref.html

NEW QUESTION # 99
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'?
  • A. Create 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).
  • B. Set 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.
  • C. Set 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
  • D. Set 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.
Answer: C
Explanation:
* 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.
References:
Amazon API Gateway Mock Integrations: https://docs.aws.amazon.com/apigateway/latest/developerguide
/how-to-mock-integration.html

NEW QUESTION # 100
A developer is creating an application that will give users the ability to store photos from their cellphones in the cloud. The application needs to support tens of thousands of users. The application uses an Amazon API Gateway REST API that is integrated with AWS Lambda functions to process the photos. The application stores details about the photos in Amazon DynamoDB. Users need to create an account to access the application. In the application, users must be able to upload photos and retrieve previously uploaded photos. The photos will range in size from 300 KB to 5 MB.
Which solution will meet these requirements with the LEAST operational overhead?
  • A. Create a users table in DynamoDB. Use the table to manage user accounts. Create a Lambda authorizer that validates user credentials against the users table. Integrate the Lambda authorizer with API Gateway to control access to the API. Use the Lambda function to store the photos in Amazon S3. Store the object's S3 key as par of the photo details in the DynamoDB table.Retrieve previously uploaded photos by querying DynamoDB for the S3 key.
  • B. Use Amazon Cognito user pools to manage user accounts. Create an Amazon Cognito user pool authorizer in API Gateway to control access to the API. Use the Lambda function to store the photos and details in the DynamoDB table. Retrieve previously uploaded photos directly from the DynamoDB table.
  • C. Create an IAM user for each user of the application during the sign-up process. Use IAM authentication to access the API Gateway API. Use the Lambda function to store the photos in Amazon S3. Store the object's S3 key as part of the photo details in the DynamoDB table.
    Retrieve previously uploaded photos by querying DynamoDB for the S3 key.
  • D. Use Amazon Cognito user pools to manage user accounts. Create an Amazon Cognito user pool authorizer in API Gateway to control access to the API. Use the Lambda function to store the photos in Amazon S3. Store the object's S3 key as part of the photo details in the DynamoDB table. Retrieve previously uploaded photos by querying DynamoDB for the S3 key.
Answer: D
Explanation:
https://docs.aws.amazon.com/apig ... way-integrate-with- cognito.html
https://aws.amazon.com/blogs/big ... -s3-metadata-index- without-servers/

NEW QUESTION # 101
A developer is writing an application that will provide data files to an external company. The external company needs to verify that the data is not modified in transit.
How can the developer use AWS KMS to prove the integrity of the transferred data?
  • A. Sign the data by using the public key of an asymmetric key pair. Provide the private key to the external company.
  • B. Encrypt the data by using a symmetric key. Provide the key to the external company.
  • C. Sign the data by using the private key of an asymmetric key pair. Provide the public key to the external company.
  • D. Sign the data by using a symmetric key. Provide the key to the external company.
Answer: C
Explanation:
To prove integrity (and authenticity) of data in transit, the correct cryptographic primitive is a digital signature. AWS KMS supports signing and verification operations using asymmetric KMS keys designed for signing (for example, RSA_SIGN_PSS, RSA_SIGN_PKCS1, or ECC_NIST_P256 key specs). The developer signs the data (or more commonly, a hash of the data) using the private key, and the external recipient verifies the signature using the corresponding public key. If the data is modified in transit, signature verification fails, proving the content was changed.
Option C exactly describes this model: sign with the private key, share the public key. The private key remains protected (ideally never leaving KMS). The public key can be distributed safely because it cannot be used to forge signatures.
Option A (encryption) provides confidentiality, not integrity proof to a third party, and sharing a symmetric encryption key is insecure and breaks key management principles.
Option B is incorrect because symmetric keys do not provide non-repudiation and generally require the verifier to possess the same secret key, which would allow the verifier to forge signatures too. While HMAC can validate integrity between trusted parties, it does not meet the typical "prove integrity" requirement to an external party without sharing a secret.
Option D is backward and insecure: you never share a private key.
Therefore, use an asymmetric KMS signing key to sign with the private key and provide the public key for verification.

NEW QUESTION # 102
......
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