Quiz 2026 Amazon DVA-C02: AWS Certified Developer - Associate–Valid Exam Forum

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Amazon AWS Certified Developer - Associate Sample Questions (Q466-Q471):

NEW QUESTION # 466
A developer is working on a web application that requires selective activation of features. Features must remain hidden from end users until they are ready for release.
Which solution will meet these requirements?

A. Create a feature flag configuration profile in AWS AppSync.
B. Create a feature flag configuration profile in AWS AppConfig. Activate and deactivate feature flags as needed.
C. Store prerelease data in AWS Amplify DataStore and toggle visibility through synchronization.
D. Store prerelease data in DynamoDB and toggle visibility by using DynamoDB Streams.

Answer: B

Explanation:
AWS AppConfig, a capability of AWS Systems Manager, is specifically designed to manage feature flags, configuration changes, and application toggles safely and dynamically. AWS documentation highlights AppConfig as the recommended service for enabling and disabling application features without redeploying code.
Feature flags in AppConfig allow developers to control visibility, rollout strategies, and gradual releases across environments. AppConfig supports validation, monitoring, and rollback to prevent misconfigurations from impacting users.
Option A is incorrect because AWS AppSync is a GraphQL service and does not manage feature flags.
Options B and D misuse data storage and synchronization services for configuration management, introducing unnecessary complexity and risk.
Using AWS AppConfig enables developers to hide features, activate them instantly when ready, and manage them centrally with minimal operational overhead.
Therefore, AWS AppConfig feature flags are the correct and AWS-recommended solution.

NEW QUESTION # 467
A developer has an application that can upload tens of thousands of objects per second to Amazon S3 in parallel within a single AWS account. As part of new requirements, data stored in S3 must use server-side encryption with AWS KMS keys (SSE-KMS). After creating this change, performance of the application is slower. Which of the following is MOST likely the cause of the application latency?

A. The client encryption of the objects is using a poor algorithm.
B. The AWS KMS API calls limit is less than needed to achieve the desired performance.
C. Amazon S3 throttles the rate at which uploaded objects can be encrypted using KMS keys.
D. KMS requires that an alias be used to create an independent display name that can be mapped to a KMS key.

Answer: B

Explanation:
When using SSE-KMS with Amazon S3, each PUT operation requires an AWS KMS Encrypt API call. If an application uploads tens of thousands of objects per second, it can exceed the KMS request rate limits, leading to throttling and increased latency. This is the most likely cause of the performance degradation.

NEW QUESTION # 468
A developer built an application by using multiple AWS Lambda functions. The Lambda functions must access dynamic configuration data at runtime. The data is maintained as a 6 KB JSON document in AWS AppConfig. The configuration data needs to be updated without requiring the redeployment of the application.
The developer needs a solution that will give the Lambda functions access to the dynamic configuration data.
What should the developer do to meet these requirements with the LEAST development effort?

A. Configure the AWS AppConfig Agent Lambda extension. Access the dynamic configuration data by calling the extension on a local host.
B. Migrate the configuration file to a Lambda deployment package. Read the file from the file system at runtime.
C. Use the AWS X-Ray SDK to call the AWS AppConfig APIs. Retrieve the configuration file at runtime.
D. Migrate the document from AWS AppConfig to a Lambda environment variable. Read the document at the runtime.

Answer: A

Explanation:
https://docs.aws.amazon.com/appconfig/latest/userguide/appconfig-integration-lambda- extensions.html

NEW QUESTION # 469
You have been doing a lot of testing of your VPC Network by deliberately failing EC2 instances to test whether instances are failing over properly. Your customer who will be paying the AWS bill for all this asks you if he being charged for all these instances. You try to explain to him how the billing works on EC2 instances to the best of your knowledge. What would be an appropriate response to give to the customer in regards to this?

A. Billing commences when Amazon EC2 AMI instance is completely up and billing ends as soon as the instance starts to shutdown.
B. Billing only commences only after 1 hour of uptime and billing ends when the instance terminates.
C. Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance and billing ends when the instance shuts down.
D. Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance and billing ends as soon as the instance starts to shutdown.

Answer: C

Explanation:
Billing commences when Amazon EC2 initiates the boot sequence of an AMI instance. Billing ends when the instance shuts down, which could occur through a web services command, by running "shutdown -h", or through instance failure.
http://aws.amazon.com/ec2/faqs/#Billing

NEW QUESTION # 470
A company runs an application in a third-party cloud. The company wants to use the application to update data in AWS by using API calls to AWS services. The API calls require credentials.
The company's security policy requires the company to limit the scope and duration of any credentials used to make API calls to AWS services.
Which solution will meet these requirements in the MOST secure way?

A. Create an IAM user for the application. Configure the application to load the IAM user's credentials as environment variables. Use the IAM user's credentials to interact with AWS services.
B. Create an IAM role for the application. Configure the application to call the AWS STS AssumeRole API. Use the STS credentials to interact with AWS services.
C. Create an IAM role for the application. Configure the application to call the AWS STS GetFederationToken API. Use the STS credentials to interact with AWS services.
D. Create an IAM user for the application. Populate an AWS Secrets Manager secret with the IAM user's AWS credentials. Use the secret to interact with AWS services.

Answer: B

Explanation:
AWS STS AssumeRole provides temporary security credentials with a limited duration and permissions scoped by the role's IAM policy. This is the most secure approach because the third- party cloud application does not need long-term IAM user credentials and can access only the AWS services allowed by the assumed role.

NEW QUESTION # 471
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