DVA-C02 Learning Materials: AWS Certified Developer - Associate& DVA-C02 Exam braindumps

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Amazon AWS Certified Developer - Associate Sample Questions (Q325-Q330):

NEW QUESTION # 325
A developer is developing an application that uses signed requests (Signature Version 4) to call other AWS services. The developer has created a canonical request, has created the string to sign, and has calculated signing information.
Which methods could the developer use to complete a signed request? (Choose two.)

A. Add the signature to an HTTP header that is named Authorization.
B. Add the signature to an HTTP header that is named WWW-Authenticate.
C. Add the signature to a query string parameter that is named X-Amz-Signature.
D. Add the signature to an HTTP header that is named Authentication.
E. Add the signature to a session cookie.

Answer: A,C

NEW QUESTION # 326
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. Install the Amazon CloudWatch Logs agent on each EC2 instance. Configure the agent to write to the log 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. Add an X-Forwarded-For header to the HTTP server log configuration file.

Answer: D

NEW QUESTION # 327
A developer is using AWS Amplify Hosting to build and deploy an application. The developer is receiving an increased number of bug reports from users. The developer wants to add end-to-end testing to the application to eliminate as many bugs as possible before the bugs reach production.
Which solution should the developer implement to meet these requirements?

A. Run the amplify add test command in the Amplify CLI.
B. Add a test phase to the aws-exports.js file for the application.
C. Create unit tests in the application. Deploy the unit tests by using the amplify push command in the Amplify CLI.
D. Add a test phase to the amplify.yml build settings for the application.

Answer: D

Explanation:
The solution that will meet the requirements is to add a test phase to the amplify.yml build settings for the application. This way, the developer can run end-to-end tests on every code commit and catch any bugs before deploying to production. The other options either do not support end-to-end testing, or do not run tests automatically.

NEW QUESTION # 328
A company developed an API application on AWS by using Amazon CloudFront. Amazon API Gateway, and AWS Lambda. The API has a minimum of four requests every second A developer notices that many API users run the same query by using the POST method. The developer wants to cache the POST request to optimize the API resources.
Which solution will meet these requirements'?

A. Save the latest request response in Lambda /tmp directory Update the Lambda function to check the
/tmp directory
B. Save the latest request m AWS Systems Manager Parameter Store Modify the Lambda function to take the latest request response from Parameter Store
C. Override the cache method in me selected stage of API Gateway Select the POST method.
D. Configure the CloudFront cache Update the application to return cached content based upon the default request headers.

Answer: D

Explanation:
This solution will meet the requirements by using Amazon CloudFront, which is a content delivery network (CDN) service that speeds up the delivery of web content and APIs to end users. The developer can configure the CloudFront cache, which is a set of edge locations that store copies of popular or recently accessed content close to the viewers. The developer can also update the application to return cached content based upon the default request headers, which are a set of HTTP headers that CloudFront automatically forwards to the origin server and uses to determine whether an object in an edge location is still valid. By caching the POST requests, the developer can optimize the API resources and reduce the latency for repeated queries.
Option B is not optimal because it will override the cache method in the selected stage of API Gateway, which is not possible or effective as API Gateway does not support caching for POST methods by default.
Option C is not optimal because it will save the latest request response in Lambda /tmp directory, which is a local storage space that is available for each Lambda function invocation, not a cache that can be shared across multiple invocations or requests. Option D is not optimal because it will save the latest request in AWS Systems Manager Parameter Store, which is a service that provides secure and scalable storage for configuration data and secrets, not a cache for API responses.
References: [Amazon CloudFront], [Caching Content Based on Request Headers]

NEW QUESTION # 329
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. Increase the timeout setting for the Lambda functions to accommodate longer processing times.
B. Enable caching, and increase the duration of the AWS AppSync cache TTL.
C. 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.
D. Configure the Lambda functions to be AWS AppSync data sources. Use Event mode for asynchronous Lambda invocation.

Answer: D

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/appsync/latest/devguide/lambda-resolvers.html#event- invocation-mode

NEW QUESTION # 330
......

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