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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Security	26%	- Apply security best practices 1. Validate application security configurations 2. Follow AWS Well-Architected Framework security principles - Secure application data 1. Implement encryption at rest and in transit 2. Manage secrets and credentials securely - Implement authentication and authorization 1. Manage IAM roles, policies, and permissions 2. Use Amazon Cognito for identity management
Topic 2: Development with AWS Services	32%	- Write code for applications hosted on AWS 1. Develop serverless applications 2. Use AWS SDKs and APIs 3. Implement architectural patterns - Integrate AWS services into applications 1. Use AWS Lambda, API Gateway, Amazon EventBridge 2. Implement messaging and event-driven workflows - Interact with AWS data services 1. Implement caching and data storage strategies 2. Work with Amazon DynamoDB, Amazon S3
Topic 3: Deployment	24%	- Prepare application artifacts for deployment 1. Use infrastructure as code (AWS CloudFormation, AWS SAM) 2. Package code and dependencies - Implement CI/CD pipelines 1. Automate deployment and testing workflows 2. Use AWS CodePipeline, CodeBuild, CodeDeploy - Deploy applications on AWS 1. Perform safe updates and rollbacks 2. Deploy to AWS Lambda, Amazon EC2, Elastic Beanstalk
Topic 4: Troubleshooting and Optimization	18%	- Troubleshoot application issues 1. Analyze logs, metrics, and traces 2. Use Amazon CloudWatch, AWS X-Ray for monitoring - Optimize application performance 1. Improve latency and throughput 2. Optimize resource usage and costs - Debug and resolve errors 1. Identify and fix code defects 2. Resolve integration and configuration problems

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Amazon AWS Certified Developer - Associate Sample Questions (Q535-Q540):

NEW QUESTION # 535
A developer is creating an application that will give users the ability to store photos from their cellphones in the cloud. The application needs to support tens of thousands of users. The application uses an Amazon API Gateway REST API that is integrated with AWS Lambda functions to process the photos. The application stores details about the photos in Amazon DynamoDB.
Users need to create an account to access the application. In the application, users must be able to upload photos and retrieve previously uploaded photos. The photos will range in size from 300 KB to 5 MB.
Which solution will meet these requirements with the LEAST operational overhead?

A. Create a users table in DynamoDB. Use the table to manage user accounts. Create a Lambda authorizer that validates user credentials against the users table. Integrate the Lambda authorizer with API Gateway to control access to the API. Use the Lambda function to store the photos in Amazon S3.
Store the object's S3 key as par of the photo details in the DynamoDB table. Retrieve previously uploaded photos by querying DynamoDB for the S3 key.
B. Create an IAM user for each user of the application during the sign-up process. Use IAM authentication to access the API Gateway API. Use the Lambda function to store the photos in Amazon S3. Store the object's S3 key as part of the photo details in the DynamoDB table. Retrieve previously uploaded photos by querying DynamoDB for the S3 key.
C. Use Amazon Cognito user pools to manage user accounts. Create an Amazon Cognito user pool authorizer in API Gateway to control access to the API. Use the Lambda function to store the photos in Amazon S3. Store the object's S3 key as part of the photo details in the DynamoDB table. Retrieve previously uploaded photos by querying DynamoDB for the S3 key.
D. Use Amazon Cognito user pools to manage user accounts. Create an Amazon Cognito user pool authorizer in API Gateway to control access to the API. Use the Lambda function to store the photos and details in the DynamoDB table. Retrieve previously uploaded photos directly from the DynamoDB table.

Answer: C

Explanation:
Explanation
Amazon Cognito user pools is a service that provides a secure user directory that scales to hundreds of millions of users. The developer can use Amazon Cognito user pools to manage user accounts and create an Amazon Cognito user pool authorizer in API Gateway to control access to the API. The developer can use the Lambda function to store the photos in Amazon S3, which is a highly scalable, durable, and secure object storage service. The developer can store the object's S3 key as part of the photo details in the DynamoDB table, which is a fast and flexible NoSQL database service. The developer can retrieve previously uploaded photos by querying DynamoDB for the S3 key and fetching the photos from S3. This solution will meet the requirements with the least operational overhead.
References:
[Amazon Cognito User Pools]
[Use Amazon Cognito User Pools - Amazon API Gateway]
[Amazon Simple Storage Service (S3)]
[Amazon DynamoDB]

NEW QUESTION # 536
A developer built an application that uses AWS Lambda functions to process images. The developer wants to improve image processing times throughout the day.
The developer needs to create an Amazon CloudWatch Logs Insights query that shows the average, slowest, and fastest processing time in 1-minute intervals.
Which query will meet these requirements?

Answer: A

Explanation:
This query filters for REPORT type log entries and calculates the average (avg(@duration)), maximum (max(@duration)), and minimum (min ) processing times, then groups these statistics by 1-minute intervals (bin(1m)). This will allow the developer to track the processing (@duration) times in 1-minute intervals, showing the average, slowest, and fastest times, which matches the requirement.

NEW QUESTION # 537
A developer is creating a new application that will give users the ability to upload documents to Amazon S3. The contents of the documents must not be accessible to any third party.
Which type of encryption will meet this requirement?

A. Server-side encryption with AWS KMS keys (SSE-KMS)
B. Dual-layer server-side encryption with AWS KMS keys (DSSE-KMS)
C. Client-side encryption by using the S3 Encryption Client with a Raw RSA wrapping key that is stored on the user's device
D. Server-side encryption with S3 managed keys (SSE-S3)

Answer: D

Explanation:
SSE-S3 is a fully managed encryption solution provided by Amazon S3. It automatically encrypts the documents before storing them and decrypts them when accessed. The encryption keys are managed by Amazon S3, and no third parties (other than the user with the proper permissions) can access the encrypted data. This solution ensures that the contents of the documents are kept secure and inaccessible to unauthorized parties, while being simple to implement and manage.

NEW QUESTION # 538
A developer is updating an application to store data in an Amazon S3 bucket. The application and the S3 bucket are in the same AWS account. The data needs to be encrypted by an AWS KMS key. The data must be accessible to an application that runs in a second AWS account. The developer has already created a bucket policy that allows the second AWS account to access the S3 bucket. Which combination of steps should the developer take to meet these requirements?
(Choose two.)

A. Update the S3 bucket policy to allow access to the KMS key.
B. Update the KMS key policy to allow access from the S3 bucket.
C. Update the KMS key policy to allow access from the second AWS account.
D. Use an AWS managed KMS key to encrypt the data.
E. Use a customer managed KMS key to encrypt the data.

Answer: C,E

Explanation:
A customer managed KMS key is required to grant cross-account access, unlike AWS managed keys which are limited to a single account.
The KMS key policy must explicitly grant usage permissions to the second AWS account so it can decrypt the data encrypted with the key.

NEW QUESTION # 539
A healthcare company is developing a multi-tier web application to manage patient records that are in an Amazon Aurora PostgreSQL database cluster. The company stores the application code in a Git repository and deploys the code to Amazon EC2 instances. The application must comply with security policies and follow the principle of least privilege. The company must securely manage database credentials and API keys within the application code. The company must have the ability to rotate encryption keys on demand.
Which solution will meet these requirements?

A. Store the database credentials and API keys in AWS Secrets Manager. Use customer managed AWS KMS keys. Set up automatic key rotation. Create a key policy in the application to retrieve secrets by using the AWS SDK.
B. Store database credentials and API keys in AWS Secrets Manager. Use AWS managed AWS KMS keys. Set up automatic key rotation. Use the AWS SDK to retrieve secrets.
C. Store the database credentials in the application code. Separate credentials by using environment- specific branches that have restricted access to the code repositories.
D. Store the database credentials and API keys as parameters in AWS Systems Manager Parameter Store. Encrypt the credentials and API keys with AWS managed AWS KMS keys. Use the AWS SDK to retrieve secrets.

Answer: B

NEW QUESTION # 540
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