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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Development with AWS Services	32%	- AWS core services development 1. Amazon S3 usage in applications 2. Amazon DynamoDB integration patterns 3. AWS Lambda functions development - Application development and integration 1. Event-driven architectures with SNS/SQS 2. API Gateway and REST APIs
Troubleshooting and Optimization	18%	- Performance optimization 1. Application performance tuning 2. Fault tolerance and resilience patterns - Monitoring and logging 1. Amazon CloudWatch metrics and logs
Deployment	24%	- Infrastructure as code 1. AWS CloudFormation templates - CI/CD and deployment strategies 1. AWS CodeBuild and CodeDeploy usage 2. AWS CodePipeline workflows
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

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Amazon AWS Certified Developer - Associate Sample Questions (Q471-Q476):

NEW QUESTION # 471
A developer is designing a new feature for an existing application. The new feature uses an AWS Lambda function. The developer wants to test the Lambda function safely in a development AWS account and a testing AWS account before deploying the function into a production AWS account. The developer must roll back the function if issues are found. Which solution will meet these requirements with the LEAST operational overhead?

A. Deploy the Lambda function to the development, testing, and production accounts separately after successfully testing the function in each environment.
B. Use Lambda layers to separate the code and the libraries that are associated with each AWS account.
Deploy and test the Lambda function with each Lambda layer in each environment.
C. Create new Lambda function versions and aliases for the development, testing, and production accounts. After successful testing, update the production alias to point to the function. Roll back to the most recent stable function version if issues are discovered.
D. Update the Lambda function code to use environment variables for the development, testing, and production accounts. Use the environment variables to make code updates available to specific environments.

Answer: C

Explanation:
Using Versions and Aliases is the native AWS Lambda mechanism for managing deployments. A version is an immutable snapshot of your code and configuration. An alias (like " PROD " ) is a pointer to a specific version. By updating the alias to point to a new version, you promote code. If a bug is found, you simply point the alias back to the previous version, enabling an instantaneous rollback with minimal overhead.

NEW QUESTION # 472
A company maintains an application that uses an Amazon RDS DB instance for its database. A developer needs to implement encryption at rest for the database. Which combination of steps should the developer take to meet this requirement? (Choose two.)

A. Restore the DB instance from the encrypted snapshot.
B. Take a snapshot of the DB instance, and create an encrypted copy of the snapshot
C. Enable encryption on the DB instance in the AWS Management Console.
D. Create a customer managed key in AWS KMS
E. Stop the DB instance

Answer: A,B

Explanation:
Amazon RDS does not support enabling encryption at rest on an existing DB instance directly. To encrypt an unencrypted DB:
- take a snapshot of the existing (unencrypted) DB instance and create an encrypted copy of that snapshot.
- restore a new DB instance from the encrypted snapshot. The new instance will have encryption at rest enabled.

NEW QUESTION # 473
A company has multiple Amazon VPC endpoints in the same VPC. A developer needs to configure an Amazon S3 bucket policy so users can access an S3 bucket only by using these VPC endpoints.
Which solution will meet these requirements?

A. Create a single S3 bucket policy that has the aws:SourceVpce value and in the StringNotEquals condition to use vpce*.
B. Create multiple S3 bucket polices by using each VPC endpoint ID that have the aws:SourceVpce value in the StringNotEquals condition.
C. Create a single S3 bucket policy that has multiple aws:sourceVpce value in the StringNotEquals condition. Repeat for all the VPC endpoint IDs.
D. Create a single S3 bucket policy that has the aws:SourceVpc value and in the StringNotEquals condition to use VPC ID.

Answer: C

NEW QUESTION # 474
A developer creates three Amazon SQS standard queues. The first queue is named process_queue and processes messages. The second queue is named dl_queue and serves as a dead-letter queue for process_queue. The third queue is named inspect_queue. The developer uses inspect_queue to inspect failed messages.
There are several messages in dl_queue that the developer wants to inspect by using inspect_queue.
How can the developer move messages to inspect_queue with the LEAST operational effort?

A. Redrive the messages to a custom destination Specify inspect_queue as the destination
B. Use Amazon EventBridge to invoke an AWS Lambda function to move messages to inspect_queue when the messages appear in dl_queue
C. Set inspect_queue as a dead-letter queue for process_queue
D. Poll for the messages in dl_queue

Answer: A

Explanation:
Amazon SQS now supports redriving messages to a custom destination, allowing developers to move messages from a dead-letter queue (DLQ) to any other queue. The LEAST operational effort way to inspect failed messages is to redrive the messages directly from dl_queue to inspect_queue by specifying it as the custom destination, without writing custom code.

NEW QUESTION # 475
A developer is building a new application on AWS. The application uses an AWS Lambda function that retrieves information from an Amazon DynamoDB table. The developer hard coded the DynamoDB table name into the Lambda function code. The table name might change over time. The developer does not want to modify the Lambda code if the table name changes.
Which solution will meet these requirements MOST efficiently?

A. Create a Lambda environment variable to store the table name. Use the standard method for the programming language to retrieve the variable.
B. Store the table name in a file. Store the file in the /tmp folder. Use the SDK for the programming language to retrieve the table name.
C. Create a global variable that is outside the handler in the Lambda function to store the table name.
D. Create a file to store the table name. Zip the file and upload the file to the Lambda layer. Use the SDK for the programming language to retrieve the table name.

Answer: A

Explanation:
Explanation
The solution that will meet the requirements most efficiently is to create a Lambda environment variable to store the table name. Use the standard method for the programming language to retrieve the variable. This way, the developer can avoid hard-coding the table name in the Lambda function code and easily change the table name by updating the environment variable. The other options either involve storing the table name in a file, which is less efficient and secure than using an environment variable, or creating a global variable, which is not recommended as it can cause concurrency issues.

NEW QUESTION # 476
......

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