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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q248-Q253):

NEW QUESTION # 248
A developer is setting up a deployment pipeline. The pipeline includes an AWS CodeBuild build stage that requires access to a database to run integration tests. The developer is using a buildspec.yml file to configure the database connection. Company policy requires automatic rotation of all database credentials.
Which solution will handle the database credentials MOST securely?

A. Retrieve the credentials from an environment variable that contains the connection string in plaintext.Configure an Amazon EventBridge event to rotate the credentials.
B. Retrieve the credentials from an environment variable that is linked to an AWS Secrets Manager secret.
Configure Secrets Manager for automatic
rotation.
C. Retrieve the credentials from variables that are hardcoded in the buildspec.yml file. Configure an AWS Lambda function to rotate the credentials.
D. Retrieve the credentials from an environment variable that is linked to a SecureString parameter in AWS Systems Manager Parameter Store. Configure Parameter Store for automatic rotation.

Answer: D

NEW QUESTION # 249
A developer is updating an application to store data in an Amazon S3 bucket. The application and the S3 bucket are in the same AWS account. The data needs to be encrypted by an AWS KMS key. The data must be accessible to an application that runs in a second AWS account. The developer has already created a bucket policy that allows the second AWS account to access the S3 bucket. Which combination of steps should the developer take to meet these requirements?
(Choose two.)

A. Update the KMS key policy to allow access from the second AWS account.
B. Update the KMS key policy to allow access from the S3 bucket.
C. Use an AWS managed KMS key to encrypt the data.
D. Use a customer managed KMS key to encrypt the data.
E. Update the S3 bucket policy to allow access to the KMS key.

Answer: A,D

Explanation:
A customer managed KMS key is required to grant cross-account access, unlike AWS managed keys which are limited to a single account.
The KMS key policy must explicitly grant usage permissions to the second AWS account so it can decrypt the data encrypted with the key.

NEW QUESTION # 250
A team of developers is creating an application that writes data to Amazon S3. Part of the application needs to programmatically append data to an existing file that is in Amazon S3. Which solution will meet this requirement?

A. Use a SelectObjectContent API call. Include the new data, the Amazon Resource Name (ARN) of the S3 bucket, and the key for the location of the existing object.
B. Use an UploadPart API call. Include the new data, the location of the existing object, and an integer value that indicates the line to begin appending the new data.
C. Use a PutObject API call. Include the new data, the location of the existing object, and an integer value that indicates the line to begin appending the new data.
D. Download the contents of the existing file. Concatenate the contents of the existing file and the new data. Upload the updated file to the existing bucket and the key for the location of the existing object.

Answer: D

Explanation:
Amazon S3 objects are immutable - you cannot append in place. To add data to an existing object, your application must first retrieve (download) the current file, concatenate the new content, and then perform a PutObject (or multipart upload) to overwrite the object with the combined data. This approach ensures the file in S3 always reflects the appended content.

NEW QUESTION # 251
A company has deployed an application on AWS Elastic Beanstalk. The company has configured the Auto Scaling group that is associated with the Elastic Beanstalk environment to have five Amazon EC2 instances.
If the capacity is fewer than four EC2 instances during the deployment, application performance degrades.
The company is using the all-at-once deployment policy.
What is the MOST cost-effective way to solve the deployment issue?

A. Change the deployment policy to rolling. Specify a batch size of 2.
B. Change the Auto Scaling group to six desired instances.
C. Change the deployment policy to rolling with additional batch. Specify a batch size of 1.
D. Change the deployment policy to traffic splitting. Specify an evaluation time of 1 hour.

Answer: C

Explanation:
This solution will solve the deployment issue by deploying the new version of the application to one new EC2 instance at a time, while keeping the old version running on the existing instances. This way, there will always be at least four instances serving traffic during the deployment, and no downtime or performance degradation will occur. Option A is not optimal because it will increase the cost of running the Elastic Beanstalk environment without solving the deployment issue. Option B is not optimal because it will split the traffic between two versions of the application, which may cause inconsistency and confusion for the customers. Option D is not optimal because it will deploy the new version of the application to two existing instances at a time, which may reduce the capacity below four instances during the deployment.
References: AWS Elastic Beanstalk Deployment Policies

NEW QUESTION # 252
A company has an application that is hosted on Amazon EC2 instances The application stores objects in an Amazon S3 bucket and allows users to download objects from the S3 bucket A developer turns on S3 Block Public Access for the S3 bucket After this change, users report errors when they attempt to download objects The developer needs to implement a solution so that only users who are signed in to the application can access objects in the S3 bucket.
Which combination of steps will meet these requirements in the MOST secure way? (Select TWO.)

A. Modify the application to delegate requests to the S3 bucket.
B. Create an EC2 instance profile and role with an appropriate policy Associate the role with the EC2 instances
C. Create an 1AM user with an appropriate policy. Store the access key ID and secret access key on the EC2 instances
D. Modify the application to use the S3 GeneratePresignedUrl API call
E. Modify the application to use the S3 GetObject API call and to return the object handle to the user

Answer: B,D

Explanation:
* IAM Roles for EC2 (A): The most secure way to provide AWS permissions from EC2.
* Create a role with a policy allowing s3:GetObject on the specific bucket.
* Attach the role to an instance profile and associate that profile with your instances.
* Pre-signed URLs (C): Temporary, authenticated URLs for specific S3 actions.
* Modify the app to use the AWS SDK to call GeneratePresignedUrl.
* Embed these URLs when a user is properly logged in, allowing download access.

NEW QUESTION # 253
......

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