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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q161-Q166):

NEW QUESTION # 161
An application that runs on AWS Lambda requires access to specific highly confidential objects in an Amazon S3 bucket. In accordance with the principle of least privilege, a company grants access to the S3 bucket by using only temporary credentials.
How can a developer configure access to the S3 bucket in the MOST secure way?

A. Create a Lambda function execution role. Attach a policy to the role that grants access to specific objects in the S3 bucket.
B. Create a secret access key and access key ID with permission to access the S3 bucket. Store the key and key ID as environment variables in Lambda. Use the environment variables to access the required S3 objects.
C. Hardcode the credentials that are required to access the S3 objects in the application code. Use the credentials to access the required S3 objects.
D. Create a secret access key and access key ID with permission to access the S3 bucket. Store the key and key ID in AWS Secrets Manager. Configure the application to retrieve the Secrets Manager secret and use the credentials to access the S3 objects.

Answer: A

Explanation:
https://docs.aws.amazon.com/lambda/latest/operatorguide/least-privilege.html

NEW QUESTION # 162
A company has built an AWS Lambda function to convert large image files into output files that can be used in a third-party viewer application. The company recently added a new module to the function to improve the output of the generated files. However, the new module has increased the bundle size and has increased the time that is needed to deploy changes to the function code.
How can a developer increase the speed of the Lambda function deployment?

A. Increase the memory size of the function.
B. Use AWS CodeDeploy to deploy the function code.
C. Use Amazon S3 to host the function dependencies.
D. Use Lambda layers to package and load dependencies.

Answer: C

NEW QUESTION # 163
A company built an online event platform For each event the company organizes quizzes and generates leaderboards that are based on the quiz scores. The company stores the leaderboard data in Amazon DynamoDB and retains the data for 30 days after an event is complete The company then uses a scheduled job to delete the old leaderboard data The DynamoDB table is configured with a fixed write capacity. During the months when many events occur, the DynamoDB write API requests are throttled when the scheduled delete job runs.
A developer must create a long-term solution that deletes the old leaderboard data and optimizes write throughput Which solution meets these requirements?

A. Configure a TTL attribute for the leaderboard data
B. Set a higher write capacity when the scheduled delete job runs
C. Use AWS Step Functions to schedule and delete the leaderboard data.
D. Use DynamoDB Streams to schedule and delete the leaderboard data

Answer: A

Explanation:
DynamoDB TTL (Time-to-Live): A native feature that automatically deletes items after a specified expiration time.
Efficiency: Eliminates the need for scheduled deletion jobs, optimizing write throughput by avoiding potential throttling conflicts.
Seamless Integration: TTL works directly within DynamoDB, requiring minimal development overhead.
Reference:
DynamoDB TTL Documentation: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html

NEW QUESTION # 164
A developer is creating an AWS Serverless Application Model (AWS SAM) template. The AWS SAM template contains the definition of multiple AWS Lambda functions, an Amazon S3 bucket, and an Amazon CtoudFront distribution. One of the Lambda functions runs on Lambda@Edge in the CloudFront distribution.
The S3 bucket is configured as an origin for the CloudFront distribution.
When the developer deploys the AWS SAM template in the eu-west-1 Region, the creation of the stack fails.
Which of the following could be the reason for this issue?

A. A single AWS SAM template cannot contain multiple Lambda functions.
B. CloudFront distributions can be created only in the us-east-1 Region.
C. Lambda@Edge functions can be created only in the us-east-1 Region.
D. The CloudFront distribution and the S3 bucket cannot be created in the same Region.

Answer: C

NEW QUESTION # 165
A developer needs to build a workflow to handle messages that are sent to an Amazon Simple Queue Service (Amazon SQS) queue. When a message reaches the queue, the workflow must implement a delay before invoking an AWS Lambda function to process the message.
Which solution will meet this requirement in the MOST operationally efficient way?

A. Set the DelaySeconds value of the SQS queue to be the number of seconds required to delay delivery of the messages. Add an event source mapping for the Lambda function. Specify the SQS queue as a source.
B. Create an AWS Step Functions state machine to process the SQS queue. Use a Wait state to delay the Lambda function's processing for the required number of seconds after message delivery to the SQS queue. Use Amazon EventBridge to invoke the state machine every 5 minutes.
C. Set the Visibility Timeout value of the SQS queue to be the number of seconds required to delay delivery of the messages. Add an event source mapping for the Lambda function. Specify the SQS queue as a source.
D. Configure the Lambda function to poll the SQS queue. Update the Lambda code to republish each message with a custom attribute that contains a future time when the message should be fully processed. Update the Lambda code to fully process messages when the custom attribute's future time has passed.

Answer: A

NEW QUESTION # 166
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