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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Deployment	24%	- CI/CD and deployment strategies 1. AWS CodeBuild and CodeDeploy usage 2. AWS CodePipeline workflows - Infrastructure as code 1. AWS CloudFormation templates
Topic 2: Development with AWS Services	32%	- AWS core services development 1. Amazon S3 usage in applications 2. AWS Lambda functions development 3. Amazon DynamoDB integration patterns - Application development and integration 1. API Gateway and REST APIs 2. Event-driven architectures with SNS/SQS
Topic 3: Troubleshooting and Optimization	18%	- Monitoring and logging 1. Amazon CloudWatch metrics and logs - Performance optimization 1. Fault tolerance and resilience patterns 2. Application performance tuning
Topic 4: Security	26%	- Application authentication and authorization 1. IAM roles and policies 2. Cognito user authentication - Data security 1. Encryption using AWS KMS 2. Secure API access patterns

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Amazon AWS Certified Developer - Associate Sample Questions (Q817-Q822):

NEW QUESTION # 817
A company has an application that uses an AWS Lambda function to process customer orders.
The company notices that the application processes some orders more than once. A developer needs to update the application to prevent duplicate processing. Which solution will meet this requirement with the LEAST implementation effort?

A. Implement a de-duplication mechanism that uses Amazon DynamoDB as the control database.
Configure the Lambda function to check for the existence of a unique identifier before processing each event.
B. Create a custom Amazon ECS task to perform idempotency checks. Use AWS Step Functions to integrate the ECS task with the Lambda function.
C. Configure the Lambda function to retry failed invocations. Implement a retry mechanism that has a fixed delay between attempts to handle duplicate events.
D. Use Amazon Athena to query processed events to identify duplicate records. Add processing logic to the Lambda function to handle the duplication scenarios that the query identifies.

Answer: A

NEW QUESTION # 818
A developer is testing an application that invokes an AWS Lambda function asynchronously.
During the testing phase, the Lambda function fails to process after two retries.
How can the developer troubleshoot the failure?

A. Configure Amazon Simple Workflow Service to process any direct unprocessed events.
B. Configure Dead Letter Queues by sending events to Amazon SQS for investigation.
C. Configure AWS Config to process any direct unprocessed events.
D. Configure AWS CloudTrail logging to investigate the invocation failures.

Answer: B

Explanation:
Dead Letter Queues (DLQ) can be configured for Lambda functions to capture failed asynchronous invocations. Events that cannot be processed will be sent to an SQS queue (or an SNS topic) you specify, allowing for further investigation and reprocessing.

NEW QUESTION # 819
When using the AWS Encryption SDK how does the developer keep track of the data encryption keys used to encrypt data?

A. The SDK stores the data encryption keys automaticity in Amazon S3.
B. The data encryption key is stored m the user data for the EC2 instance.
C. The developer must manually keep Hack of the data encryption keys used for each data object.
D. The SDK encrypts the data encryption key and stores it (encrypted) as part of the resumed ophertext.

Answer: D

Explanation:
Explanation
This solution will meet the requirements by using AWS Encryption SDK, which is a client-side encryption library that enables developers to encrypt and decrypt data using data encryption keys that are protected by AWS Key Management Service (AWS KMS). The SDK encrypts the data encryption key with a customer master key (CMK) that is managed by AWS KMS, and stores it (encrypted) as part of the returned ciphertext.
The developer does not need to keep track of the data encryption keys used to encrypt data, as they are stored with the encrypted data and can be retrieved and decrypted by using AWS KMS when needed. Option A is not optimal because it will require manual tracking of the data encryption keys used for each data object, which is error-prone and inefficient. Option C is not optimal because it will store the data encryption keys automatically in Amazon S3, which is unnecessary and insecure as Amazon S3 is not designed for storing encryption keys.
Option D is not optimal because it will store the data encryption key in the user data for the EC2 instance, which is also unnecessary and insecure as user data is not encrypted by default.
References: [AWS Encryption SDK], [AWS Key Management Service]

NEW QUESTION # 820
A company hosts a client-side web application for one of its subsidiaries on Amazon S3. The web application can be accessed through Amazon CloudFront from https://www.example.com. After a successful rollout, the company wants to host three more client-side web applications for its remaining subsidiaries on three separate S3 buckets.
To achieve this goal, a developer moves all the common JavaScript files and web fonts to a central S3 bucket that serves the web applications. However, during testing, the developer notices that the browser blocks the JavaScript files and web fonts.
What should the developer do to prevent the browser from blocking the JavaScript files and web fonts?

A. Create four access points that allow access to the central S3 bucket. Assign an access point to each web application bucket.
B. Create a cross-origin resource sharing (CORS) configuration that allows access to the central S3 bucket. Add the CORS configuration to the central S3 bucket.
C. Create a Content-MD5 header that provides a message integrity check for the central S3 bucket. Insert the Content-MD5 header for each web application request.
D. Create a bucket policy that allows access to the central S3 bucket. Attach the bucket policy to the central S3 bucket.

Answer: B

Explanation:
This is a frequent trouble. Web applications cannot access the resources in other domains by default, except some exceptions. You must configure CORS on the resources to be accessed. https://docs.aws.amazon.com/AmazonS3/latest/userguide/cors.html

NEW QUESTION # 821
A developer is creating an AWS Lambda function that will connect to an Amazon RDS for MySQL instance. The developer wants to store the database credentials. The database credentials need to be encrypted and the database password needs to be automatically rotated.
Which solution will meet these requirements?

A. Store the database credentials in the X-Amz-Security-Token parameter. Set up managed rotation on the parameter.
B. Store the database credentials in AWS Systems Manager Parameter Store as secure string parameters. Set up managed rotation on the parameters.
C. Store the database credentials in AWS Secrets Manager. Set up managed rotation on the database credentials.
D. Store the database credentials as environment variables for the Lambda function. Set the environment variables to rotate automatically.

Answer: C

NEW QUESTION # 822
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