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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q413-Q418):

NEW QUESTION # 413
A developer is testing an AWS Lambda function that processes messages from an Amazon SQS queue. Some messages reappear in the queue while they are still being processed.
What should the developer do to correct this behavior?

A. Increase the visibility timeout of the SQS queue.
B. Increase the batch size in the event source mapping.
C. Increase the Lambda memory allocation.
D. Increase the Lambda timeout.

Answer: A

Explanation:
Comprehensive and Detailed Explanation (250-300 words):
Amazon SQS uses a visibility timeout to prevent other consumers from processing a message while it is being handled. If a Lambda function does not complete processing before the visibility timeout expires, the message becomes visible again and can be processed a second time.
AWS documentation states that the SQS visibility timeout should be greater than the maximum Lambda execution time. If not, messages may be delivered multiple times, even though processing is still in progress.
Increasing the Lambda timeout or memory does not directly affect message visibility. Increasing batch size can worsen the problem by increasing processing time.
Therefore, increasing the SQS visibility timeout is the correct and AWS-recommended solution.

NEW QUESTION # 414
A company has a large amount of data in an Amazon DynamoDB table. A large batch of data is appended to the table once each day. The company wants a solution that will make all the existing and future data in DynamoDB available for analytics on a long-term basis.
Which solution meets these requirements with the LEAST operational overhead?

A. Configure Amazon DynamoDB Streams to write records to Amazon S3.
B. Configure Amazon EMR to copy DynamoDB data to Hadoop Distributed File System (HDFS).
C. Configure DynamoDB incremental exports to Amazon S3.
D. Configure Amazon EMR to copy DynamoDB data to Amazon S3.

Answer: C

NEW QUESTION # 415
A company has an application that uses an AWS Lambda function to process data. A developer must implement encryption in transit for all sensitive configuration data, such as API keys, that is stored in the application. The developer creates an AWS Key Management Service (AWS KMS) customer managed key.
What should the developer do next to meet the encryption requirement?

A. Create parameters of the String type in AWS Systems Manager Parameter Store. For each parameter, specify the KMS key ID to encrypt the parameter in transit. Reference the GetParameter API call in the Lambda environment variables.
B. Create objects in Amazon S3 for each sensitive data field. Specify the customer managed KMS key to encrypt the object. Configure the Lambda function to retrieve the objects from Amazon S3 during data processing.
C. Create secrets in AWS Secrets Manager by using the customer managed KMS key. Create a new Lambda function and set up a Lambda layer. Configure the Lambda layer to retrieve the values from Secrets Manager.
D. Create encrypted Lambda environment variables. Specify the customer managed KMS key to encrypt the variables. Enable encryption helpers for encryption in transit. Grant permission to the Lambda function's execution role to access the KMS key.

Answer: D

NEW QUESTION # 416
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.

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

Answer: B

Explanation:
Comprehensive Detailed Step by Step Explanation with All AWS Developer Reference:
The AWS Serverless Application Model (SAM) includes features for local testing and debugging of AWS Lambda functions. One of the most efficient ways to generate test payloads that match actual AWS event structures is by using the sam local generate-event command.
sam local generate-event: This command allows developers to create pre-configured test event payloads for various AWS services (e.g., S3, API Gateway, SNS). These generated events accurately reflect the format that the service would use in a live environment, reducing the manual work required to create these events from scratch.
Operational Overhead: This approach reduces overhead since the developer does not need to manually create or maintain test events. It ensures that the structure is correct and up-to-date with the latest AWS standards.
Alternatives:
Option A suggests using shareable test events, but manually creating or sharing these events introduces more overhead.
Option B and C both involve manually storing and maintaining test events, which adds unnecessary complexity compared to using sam local generate-event.
Reference:
AWS SAM CLI documentation

NEW QUESTION # 417
A company has an AWS Step Functions state machine named myStateMachine. The company configured a service role for Step Functions.
The developer must ensure that only the myStateMachine state machine can assume the service role.
Which statement should the developer add to the trust policy to meet this requirement?

Answer: B

Explanation:
The ArnLike condition with aws:SourceArn specifically matches the ARN of the myStateMachine state machine. It restricts access to only the specific state machine with the ARN arn:aws:states:ap-south-1:111111111111:stateMachine:myStateMachine.

NEW QUESTION # 418
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