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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q440-Q445):

NEW QUESTION # 440
A developer has built an application that inserts data into an Amazon DynamoDB table. The table is configured to use provisioned capacity. The application is deployed on a burstable nano Amazon EC2 instance. The application logs show that the application has been failing because of a ProvisionedThroughputExceededException error.
Which actions should the developer take to resolve this issue? (Choose two.)

A. Reduce the frequency of requests to DynamoDB by implementing exponential backoff.
B. Move the application to a larger EC2 instance.
C. Increase the frequency of requests to DynamoDB by decreasing the retry delay.
D. Increase the number of read capacity units (RCUs) that are provisioned for the DynamoDB table.
E. Change the capacity mode of the DynamoDB table from provisioned to on-demand.

Answer: A,E

NEW QUESTION # 441
A developer needs to fix an AWS CodeDeploy deployment that failed. During the failed deployment, the developer received the following error message:
"The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available for deployment, or some instances in your deployment group are experiencing problems. (Error code: HEALTH-CONSTRAINTS)" What are the possible causes of the failed deployment? (Choose two.)

A. CodeDeploy was trying to deploy to instances that were attached to an IAM instance profile that did not have the required permissions.
B. The CodeDeploy agent was not running on the instances that CodeDeploy was trying to deploy to.
C. CodeDeploy was trying to deploy to instances that were not set up with correct CodeDeploy health checks.
D. The developer's IAM role did not have the necessary permissions to perform code deployment to the instances.
E. The unified Amazon CloudWatch agent was not running on the instances that CodeDeploy was trying to deploy to.

Answer: B,C

Explanation:
If the CodeDeploy agent is not running on the instances, it cannot carry out the deployment process, leading to failure and health constraints errors.
Instances need to pass health checks during deployment. If they are not set up properly for health checks, CodeDeploy will report failures and might result in a HEALTH-CONSTRAINTS error.

NEW QUESTION # 442
A developer wants to insert a record into an Amazon DynamoDB table as soon as a new file is added to an Amazon S3 bucket.
Which set of steps would be necessary to achieve this?

A. Create an event with Amazon EventBridge that will monitor the S3 bucket and then insert the records into DynamoDB.
B. Create a cron job that will run at a scheduled time and insert the records into DynamoDB.
C. Create an AWS Lambda function that will poll the S3 bucket and then insert the records into DynamoDB.
D. Configure an S3 event to invoke an AWS Lambda function that inserts records into DynamoDB.

Answer: D

Explanation:
Amazon S3 is a service that provides highly scalable, durable, and secure object storage. Amazon DynamoDB is a fully managed NoSQL database service that provides fast and consistent performance with seamless scalability. AWS Lambda is a service that lets developers run code without provisioning or managing servers. The developer can configure an S3 event to invoke a Lambda function that inserts records into DynamoDB whenever a new file is added to the S3 bucket. This solution will meet the requirement of inserting a record into DynamoDB as soon as a new file is added to S3.
Reference:
[Amazon Simple Storage Service (S3)]
[Amazon DynamoDB]
[What Is AWS Lambda? - AWS Lambda]
[Using AWS Lambda with Amazon S3 - AWS Lambda]

NEW QUESTION # 443
An application that is running on Amazon EC2 instances stores data in an Amazon S3 bucket. All the data must be encrypted in transit.
How can a developer ensure that all traffic to the S3 bucket is encrypted?

A. Install certificates on the EC2 instances.
B. Configure the S3 bucket with server-side encryption with AWS KMS managed encryption keys (SSE- KMS).
C. Create a private VPC endpoint.
D. Create an S3 bucket policy that denies traffic when the value for the aws:SecureTransport condition key is false.

Answer: D

Explanation:
"Encryption in transit" means the connection between the client (EC2 instances) and Amazon S3 must use TLS/HTTPS, not plain HTTP. The most direct way to enforce this at the bucket level is an S3 bucket policy that denies any request that is not using secure transport. AWS provides the global condition key aws:
SecureTransport, which evaluates to true when a request is made over HTTPS and false when made over HTTP.
By adding an explicit Deny statement conditioned on aws:SecureTransport = false, the bucket rejects any insecure requests regardless of who makes them. This ensures that even if an application is misconfigured (or a user tries to access the bucket over HTTP), S3 will refuse the request. This is a strong enforcement mechanism because explicit denies in IAM policies override allows.
Option C (SSE-KMS) provides encryption at rest, not in transit. It protects objects while stored in S3 but does not force clients to use TLS for transport. Option B (VPC endpoint) can keep traffic on the AWS network path and can be combined with endpoint policies, but it does not inherently guarantee TLS usage unless you also enforce HTTPS. Option A (installing certificates) is not the mechanism for controlling whether the application uses HTTPS to S3; the S3 client uses AWS-managed TLS endpoints, and enforcement should happen through policy.
Therefore, the correct solution is D: create an S3 bucket policy that denies requests when aws:
SecureTransport is false, ensuring all access uses encrypted transport (HTTPS/TLS).

NEW QUESTION # 444
A team is developing an application that is deployed on Amazon EC2 instances. During testing, the team receives an error. The EC2 instances are unable to access an Amazon S3 bucket.
Which steps should the team take to troubleshoot this issue? (Select TWO.)

A. Check the S3 Lifecycle policy to validate the permissions that are assigned to the S3 bucket.
B. Check whether the policy that is assigned to the JAM role that is attached to the EC2 instances grants access to Amazon S3.
C. Check whether the policy that is assigned to the 1AM user that is attached to the EC2 instances grants access to Amazon S3.
D. Check the S3 bucket policy to validate the access permissions for the S3 bucket.
E. Check the security groups that are assigned to the EC2 instances. Make sure that a rule is not blocking the access to Amazon S3.

Answer: B,D

NEW QUESTION # 445
......

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