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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q224-Q229):

NEW QUESTION # 224
A healthcare company uses AWS Amplify to host a patient management system. The system uses Amazon API Gateway to expose RESTful APIs. The backend logic of the system is handled by AWS Lambda functions.
One of the Lambda functions receives patient data that includes personally identifiable information (PII). The Lambda function sends the patient data to an Amazon DynamoDB table. The company must encrypt all patient data at rest and in transit before the data is stored in DynamoDB.

A. Use AWS managed AWS KMS keys to encrypt the data in the DynamoDB table.
B. Configure the Lambda function to use AWS KMS keys with the AWS Database Encryption SDK to encrypt the patient data before sending the data to DynamoDB.
C. Configure a DynamoDB stream on the table to invoke a Lambda function. Configure the Lambda function to use an AWS KMS key to encrypt the DynamoDB table and to update the table.
D. Use an AWS Step Functions workflow to transfer the data to an Amazon SQS queue. Configure a Lambda function to encrypt the data in the queue before sending the data to the DynamoDB table.

Answer: B

Explanation:
* Why Option A is Correct:Encrypting PII at rest and in transit before storing it in DynamoDB ensures end-to-end security. Using the AWS Database Encryption SDK with KMS keys allows the Lambda function to encrypt data before transmission, meeting security and compliance requirements.
* Why Other Options are Incorrect:
* Option B: While AWS-managed KMS keys encrypt DynamoDB data at rest, they do not encrypt data in transit.
* Option C: DynamoDB streams process updates after the data is written to the table, failing to encrypt PII in transit.
* Option D: Step Functions and SQS add unnecessary complexity and still require encryption logic for both transit and at rest.
* AWS Documentation References:
* Encrypting Data in DynamoDB
* AWS Database Encryption SDK

NEW QUESTION # 225
A developer is working on an application that will store protected health information (PHI) in an Amazon RDS database. The developer applies encryption to the database. The developer must also encrypt the PHI data separately to prevent administrators from accessing the data.
Because some of the PHI data files are large, the developer must encrypt the PHI data in the application locally before saving the data to the database.
Which solution will meet these requirements in the MOST secure way?

A. Create an AWS KMS customer managed key. Use the KMS Encrypt operation to encrypt the PHI data before storing the PHI data in the database.
B. Configure the database to use an AWS KMS managed key for encryption.
C. Generate a 256-bit AES encryption key. Store the key in base64-encoded format in the application source code. Use the encryption key to encrypt the PHI data before storing the PHI data in the database.
D. Create an AWS KMS customer managed key. Use envelope encryption to encrypt the PHI data.Store the encrypted key in the same database record that stores the PHI data.

Answer: D

Explanation:
For large PHI payloads, the most secure pattern is envelope encryption: the application generates a unique data key to encrypt the PHI locally with a symmetric algorithm, then uses an AWS KMS customer managed key to encrypt (wrap) that data key. The application stores the encrypted data key alongside the encrypted PHI so it can later decrypt the data key through KMS and decrypt the PHI. This provides strong separation of duties and avoids sending large data to KMS for direct encryption.

NEW QUESTION # 226
A company runs an application on AWS. The application uses an AWS Lambda function that is configured with an Amazon Simple Queue Service (Amazon SQS) queue called high priority queue as the event source. A developer is updating the Lambda function with another SQS queue called low priority queue as the event source. The Lambda function must always read up to 10 simultaneous messages from the high priority queue before processing messages from low priority queue. The Lambda function must be limited to 100 simultaneous invocations.
Which solution will meet these requirements?

A. Set the event source mapping maximum concurrency to 10 for the high priority queue and to 90 for the low priority queue.
B. Set the delivery delay to 0 seconds for the high priority queue and to 10 seconds for the low priority queue.
C. Set the event source mapping batch window to 10 for the high priority queue and to 90 for the low priority queue.
D. Set the event source mapping batch size to 10 for the high priority queue and to 90 for the low priority queue.

Answer: A

Explanation:
https://docs.aws.amazon.com/lambda/latest/dg/with-sqs.html#events-sqs-max-concurrency

NEW QUESTION # 227
A company is using the AWS Serverless Application Model (AWS SAM) to develop a social media application. A developer needs a quick way to test AWS Lambda functions locally by using test event payloads. The developer needs the structure of these test event payloads to match the actual events that AWS services create.
Which solution will meet these requirements with the LEAST development effort?

A. Use the sam local generate-event command to create test payloads for local testing.
B. Create shareable test Lambda events. Use these test Lambda events for local testing.
C. Store manually created test event payloads locally. Use the sam local invoke command with the file path to the payloads.
D. Store manually created test event payloads in an Amazon S3 bucket. Use the sam local invoke command with the S3 path to the payloads.

Answer: A

Explanation:
Using the sam local generate-event command is the best solution because the sam local generate-event command automatically generates event payloads that match the structure of real AWS service events. It simplifies testing by providing predefined events for a variety of AWS services and does not require the developer to manually create or store test payloads. This solution requires the least development effort and matches the requirement to test Lambda functions locally with accurate event payloads.

NEW QUESTION # 228
A company needs to package and deploy an application that uses AWS Lambda to compress and decompress video clips. The application uses a video codec library that is larger than 250 MB. The application uses the library to compress the videos before storage and to decompress the videos upon retrieval.
Which solution will meet these requirements?

A. Create two Lambda functions. Build one container image that contains code to handle video compression and a second image that contains video decompression code. Add the codec library to both images. Upload the images to Amazon ECR. Use the containers to create the Lambda functions.
B. Create one Lambda function. Upload one zip file that contains code to handle video compression and decompression to the function. Include the codec library in the zip file.
C. Create two Lambda functions. Upload one zip file that contains code to handle video compression to one function. Upload a second zip file that contains code for video decompression to the second function. Create one Lambda layer for the codec library. Add the layer to both functions.
D. Create two Lambda functions. Upload one zip file that contains code to handle video compression to one function. Upload a second zip file that contains code for video decompression to the second function. Include the codec library in both zip files.

Answer: A

Explanation:
AWS Lambda supports container images up to 10 GB in size, making it suitable for applications with large dependencies, such as a video codec library larger than 250 MB. By creating separate container images for video compression and decompression, the application can efficiently isolate functionality while ensuring that each function includes the required dependencies.
The container images are stored in Amazon ECR and used to create the Lambda functions.

NEW QUESTION # 229
......

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