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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Troubleshooting and Optimization	18%	- Instrument code for observability 1. Amazon CloudWatch alarms 2. Amazon CloudWatch metrics 3. Custom metrics 4. AWS X-Ray 5. Structured logging - Optimize applications by using AWS services and features 1. Caching strategies (ElastiCache, CloudFront) 2. Cost optimization 3. Data storage optimization 4. Memory and compute optimization 5. Concurrency and throttling - Assist in a root cause analysis 1. Amazon CloudWatch Logs 2. Application logging 3. AWS X-Ray 4. AWS CloudTrail 5. Error handling and retries
Topic 2: Security	26%	- Implement encryption by using AWS services 1. Amazon S3 encryption 2. AWS KMS 3. AWS Secrets Manager 4. AWS Certificate Manager 5. AWS CloudHSM - Implement authentication and/or authorization for applications and AWS services 1. Bearer tokens (JWT, OAuth, AWS STS) 2. User pools and identity pools in Amazon Cognito 3. Resource-based policies, service policies, and principal policies 4. Role-based access control (RBAC) 5. Identity federation (SAML, OpenID Connect, Amazon Cognito) - Manage sensitive data in application code 1. AWS Systems Manager Parameter Store 2. AWS Secrets Manager 3. Encryption of data at rest and in transit 4. Environment variables
Topic 3: Deployment	24%	- Prepare application artifacts to be deployed to AWS 1. AWS CloudFormation 2. Lambda deployment packages 3. AWS SAM 4. AWS CDK 5. Docker containers - Automate deployment testing 1. AWS CodeDeploy 2. AWS CodeCommit 3. AWS CodePipeline 4. AWS CodeBuild - Test applications in development environments 1. Mocking AWS services 2. AWS SAM local 3. Local testing of Lambda functions - Deploy code by using AWS CI/CD services 1. AWS CodeDeploy 2. Rolling deployments 3. AWS CodeCommit 4. AWS CodePipeline 5. Blue/green deployments 6. GitHub integration 7. AWS CodeBuild 8. Canary deployments
Topic 4: Development with AWS Services	32%	- Use data stores in application development 1. Amazon EFS 2. Amazon ElastiCache 3. Amazon S3 4. Amazon DynamoDB 5. Amazon RDS - Develop code for AWS serverless applications 1. Amazon API Gateway 2. Amazon EventBridge 3. AWS AppSync 4. AWS Step Functions - Develop code for applications hosted on AWS 1. Amazon API Gateway 2. Amazon SQS 3. AWS CLI 4. AWS CloudFormation 5. Amazon SNS 6. Amazon Cognito 7. AWS Lambda 8. Amazon S3 9. Amazon DynamoDB 10. AWS SDKs

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Amazon AWS Certified Developer - Associate Sample Questions (Q37-Q42):

NEW QUESTION # 37
A company maintains a REST service using Amazon API Gateway and the API Gateway native API key validation. The company recently launched a new registration page, which allows users to sign up for the service. The registration page creates a new API key using CreateApiKey and sends the new key to the user. When the user attempts to call the API using this key, the user receives a 403 Forbidden error. Existing users are unaffected and can still call the API.
What code updates will grant these new users access to the API?

A. The createUsagePlanKey method must be called to associate the newly created API key with the correct usage plan.
B. The importApiKeys method must be called to import all newly created API keys into the current stage of the API.
C. The createDeployment method must be called so the API can be redeployed to include the newly created API key.
D. The updateAuthorizer method must be called to update the API's authorizer to include the newly created API key.

Answer: A

NEW QUESTION # 38
A developer is building an application that reads data from an Amazon Aurora database cluster.
The cluster is configured as an Aurora global database that includes a second cluster in a secondary AWS Region. The company stores the database credentials for the application in an AWS Secrets Manager secret in the primary Region. The credentials are rotated regularly. The developer wants to ensure that the application can run in both Regions and is highly available across Regions. Which combination of actions will meet these requirements? (Choose two.)

A. Configure the application to retrieve the database credentials from the secret in the primary Region.
B. Replicate the secret to the secondary Region. Promote the replica secret to a standalone secret.
Configure the application to retrieve the database credentials from the standalone secret.
C. Store the database endpoint and credentials for the secondary Region in local environment variables. Configure the application to connect to the environment variables.
D. Replicate the secret to the secondary Region. Configure the application to retrieve credentials from the replica secret.
E. Store the database endpoint and credentials as a secret. Configure the application to connect to the secret.

Answer: D,E

Explanation:
Replicating the Secrets Manager secret to the secondary Region allows the application in each Region to retrieve credentials locally, improving cross-Region availability and avoiding dependency on the primary Region during a regional issue. Storing both the database endpoint and credentials in Secrets Manager lets the application retrieve the correct connection information securely and consistently for the Region where it is running.

NEW QUESTION # 39
A real-time messaging application uses Amazon API Gateway WebSocket APIs with backend HTTP service.
A developer needs to build a feature in the application to identify a client that keeps connecting to and disconnecting from the WebSocket connection. The developer also needs the ability to remove the client Which combination of changes should the developer make to the application to meet these requirements?
(Select TWO.)

A. Switch to HTTP APIs in the backend service.
B. Add code to track the client status in Amazon ElastiCache in the backend service.
C. Implement $connect and $disconnect routes in the backend service.
D. Switch to REST APIs in the backend service.
E. Use the callback URL to disconnect the client from the backend service.

Answer: B,C

Explanation:
Requirement Summary:
* WebSocket-based messaging app usingAPI Gateway WebSocket APIs
* Need to:
* Identify clients repeatedlyconnecting/disconnecting
* Be able toremoveproblematic clients
Evaluate Options:
A: Switch to HTTP APIs
* #HTTP APIs don't supportWebSocketconnections
B: Switch to REST APIs
* #REST APIs arenot compatiblewith WebSockets
#C. Use the callback URL to disconnect clients
* ##Possible, butnot a direct option
* Callback URLs are used forsending messages to connected clients, not for disconnecting
#D. Track client status in ElastiCache
* #Good solution: Store and update connection state (connected, disconnected, timestamps)
* Helpstrack abuse or reconnections
#E. Implement $connect and $disconnect routes
* #Required to captureconnection lifecycle events
* These can be used to log/store client behavior and decide on removal
* WebSocket routes in API Gateway: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-route-selection.html
* Managing WebSocket connections: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-mapping-template-reference.html

NEW QUESTION # 40
A company has developed an application that uses AWS Lambda functions to process messages from an Amazon SQS queue. One of the Lambda functions makes a call to an external API that is expected to encounter temporary service unavailability.
A developer needs to configure the function to retry failed messages from an Amazon SQS dead-letter queue.
The developer notices that the Lambda function is re-processing some messages in the queue more than once.
Which solution will resolve this issue?

A. Set the delivery delay parameter at the queue level. Configure the Lambda function to delete processed messages from the queue.
B. Set a message retention period for each message. Configure the Lambda function to add a MessageId to each message.
C. Set the visibility timeout parameter at the queue level. Configure the Lambda function to delete processed messages from the queue.
D. Set a receive message wait time for each message. Configure the Lambda function to add a MessageId to each message.

Answer: C

Explanation:
* Why Option B is Correct:Setting the visibility timeout ensures that once a message is being processed, it is temporarily hidden from other consumers. The Lambda function must delete processed messages to avoid re-processing when the visibility timeout expires.
* Why Other Options are Incorrect:
* Option A: Message retention affects how long messages stay in the queue, not how they are processed.
* Option C: Receive message wait time optimizes long polling but does not prevent re-processing.
* Option D: Delivery delay introduces latency for new messages and does not address message re- processing.
* AWS Documentation References:
* Using SQS Visibility Timeout

NEW QUESTION # 41
A company runs an application as an Amazon ECS service on an AWS Fargate cluster. The company has configured the service to use the rolling update deployment type. The company set the minimum healthy percentage to 100% and set the maximum healthy percentage to 200%.
A developer observes that a new deployment of the ECS service is failing continuously. The developer must ensure that Amazon ECS restores the most recently completed service deployment when a new service deployment fails.
Which solution will meet this requirement?

A. Use the rolling deployment type. Enable deployment circuit breaker and rollback on failures options.
B. Use Amazon ECS service auto scaling. Set the scaling policy type as step scaling.
C. Use the blue/green deployment type. Enable the deployment circuit breaker and rollback on failures options.
D. Use Amazon ECS service auto scaling. Set the scaling policy type as target tracking.

Answer: A

Explanation:
Amazon ECS supports an automatic rollback capability for services by enabling the deployment circuit breaker with the rollback option. With a rolling update deployment, if the new deployment fails to reach a steady state, ECS will stop the failed deployment and restore the service to the last known good (most recently completed) deployment.

NEW QUESTION # 42
......

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