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[General] DVA-C02 Test Papers | Test DVA-C02 Questions

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【General】 DVA-C02 Test Papers | Test DVA-C02 Questions

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Amazon AWS Certified Developer - Associate Sample Questions (Q154-Q159):NEW QUESTION # 154
A company is planning to use AWS CodeDeploy to deploy an application to Amazon Elastic Container Service (Amazon ECS) During the deployment of a new version of the application, the company initially must expose only 10% of live traffic to the new version of the deployed application. Then, after 15 minutes elapse, the company must route all the remaining live traffic to the new version of the deployed application.
Which CodeDeploy predefined configuration will meet these requirements?
  • A. CodeDeployDefault LambdaCanary10Percent5Minutes
  • B. CodeDeployDefault LambdaCanary10Percent15Minutes
  • C. CodeDeployDefault ECSLinear10PercentEvery1 Minutes
  • D. CodeDeployDefault ECSCanary10Percent15Minutes
Answer: D
Explanation:
* CodeDeploy Predefined Configurations: CodeDeploy offers built-in deployment configurations for common scenarios.
* Canary Deployment: Canary deployments gradually shift traffic to a new version, ideal for controlled rollouts like this requirement.
* CodeDeployDefault.ECSCanary10Percent15Minutes: This configuration matches the company's requirements, shifting 10% of traffic initially and then completing the rollout after 15 minutes.

NEW QUESTION # 155
An ecommerce company is using an AWS Lambda function behind Amazon API Gateway as its application tier. To process orders during checkout, the application calls a POST API from the frontend. The POST API invokes the Lambda function asynchronously. In rare situations, the application has not processed orders. The Lambda application logs show no errors or failures.
What should a developer do to solve this problem?
  • A. Inspect the Lambda logs in Amazon CloudWatch for possible errors. Fix the errors.
  • B. Create and inspect the Lambda dead-letter queue. Troubleshoot the failed functions. Reprocess the events.
  • C. Inspect the frontend logs for API failures. Call the POST API manually by using the requests from the log file.
  • D. Make sure that caching is disabled for the POST API in API Gateway.
Answer: B
Explanation:
Explanation
The solution that will solve this problem is to create and inspect the Lambda dead-letter queue. Troubleshoot the failed functions. Reprocess the events. This way, the developer can identify and fix any issues that caused the Lambda function to fail when invoked asynchronously by API Gateway. The developer can also reprocess any orders that were not processed due to failures. The other options either do not address the root cause of the problem, or do not help recover from failures.

NEW QUESTION # 156
A developer is writing an application to analyze the traffic to a fleet of Amazon EC2 instances.
The EC2 instances run behind a public Application Load Balancer (ALB). An HTTP server runs on each of the EC2 instances, logging all requests to a log file.
The developer wants to capture the client public IP addresses. The developer analyzes the log files and notices only the IP address of the ALB.
What must the developer do to capture the client public IP addresses in the log file?
  • A. Add an X-Forwarded-For header to the HTTP server log configuration file.
  • B. Install the AWS X-Ray daemon on each EC2 instance. Configure the daemon to write to the log file.
  • C. Add a Host header to the HTTP server log configuration file.
  • D. Install the Amazon CloudWatch Logs agent on each EC2 instance. Configure the agent to write to the log file.
Answer: A

NEW QUESTION # 157
A developer is creating a mobile application that will not require users to log in.
What is the MOST efficient method to grant users access to AWS resources'?
  • A. Create credentials using AWS KMS and apply these credentials to users when using the application.
  • B. Use an identity provider to securely authenticate with the application.
  • C. Use Amazon Cognito to associate unauthenticated users with an IAM role that has limited access to resources.
  • D. Create an AWS Lambda function to create an 1AM user when a user accesses the application.
Answer: C
Explanation:
This solution is the most efficient method to grant users access to AWS resources without requiring them to log in. Amazon Cognito is a service that provides user sign-up, sign-in, and access control for web and mobile applications. Amazon Cognito identity pools support both authenticated and unauthenticated users. Unauthenticated users receive access to your AWS resources even if they aren't logged in with any of your identity providers (IdPs). You can use Amazon Cognito to associate unauthenticated users with an IAM role that has limited access to resources, such as Amazon S3 buckets or DynamoDB tables. This degree of access is useful to display content to users before they log in or to allow them to perform certain actions without signing up. Using an identity provider to securely authenticate with the application will require users to log in, which does not meet the requirement. Creating an AWS Lambda function to create an IAM user when a user accesses the application will incur unnecessary costs and complexity, and may pose security risks if not implemented properly. Creating credentials using AWS KMS and applying them to users when using the application will also incur unnecessary costs and complexity, and may not provide fine-grained access control for resources.

NEW QUESTION # 158
A developer wants to use an AWS AppSync API to invoke AWS Lambda functions to return data. Some of the Lambda functions perform long-running processes. The AWS AppSync API needs to return responses immediately.
Which solution will meet these requirements with the LEAST operational overhead?
  • A. Configure the Lambda functions to be AWS AppSync data sources. Use Event mode for asynchronous Lambda invocation.
  • B. Set up an Amazon SQS queue. Configure AWS AppSync to send messages to the SQS queue.
    Configure a Lambda function event source mapping to poll the queue.
  • C. Enable caching, and increase the duration of the AWS AppSync cache TTL.
  • D. Increase the timeout setting for the Lambda functions to accommodate longer processing times.
Answer: A
Explanation:
Step-by-Step Breakdown:
Requirement Summary:
* AWS AppSync API needs toinvoke Lambda functions
* Some Lambda functions arelong-running
* AppSync shouldreturn immediately, minimizingoperational overhead
**Option A: AppSync + Lambda as data source usingEvent Mode
* #Correct: AWS AppSync supportsasynchronous (event) invocationof Lambda data sources using Event Mode.
* Event Mode means:
* AppSync invokes Lambdaasynchronously
* Immediately returns aresponseto the client (typically a predefined payload or null)
* Ideal forfire-and-forgetworkloads or when the response is not immediately needed Option B: Increase Lambda timeout
* #Incorrect: This keeps AppSync waiting.
* Even with increased timeout, synchronous invocations wouldblock AppSync responses.
Option C: SQS queue + polling Lambda
* #Possible but too complex for this use case.
* Requires additional infrastructure: queue + mapping + custom logic.
* Higheroperational overheadcompared to built-in AppSync Event Mode.
Option D: Enable caching in AppSync
* #Irrelevant: AppSync cache is for optimizing repeated read queries,not for async workflows.
* Asynchronous Lambda with AppSync:https://docs.aws.amazon.com/appsync/latest/devguide/resolver- mapping-template-reference-lambda.html#async-lambda-invocation
* Lambda as AppSync Data Source:https://docs.aws.amazon.com/appsync/latest/devguide/tutorial- lambda-resolvers.html
* Event Mode Docs:https://docs.aws.amazon.com/apps ... solvers.html#event- invocation-mode

NEW QUESTION # 159
......
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