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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Security	26%	- Application authentication and authorization 1. IAM roles and policies 2. Cognito user authentication - Data security 1. Encryption using AWS KMS 2. Secure API access patterns
Development with AWS Services	32%	- Application development and integration 1. Event-driven architectures with SNS/SQS 2. API Gateway and REST APIs - AWS core services development 1. Amazon DynamoDB integration patterns 2. AWS Lambda functions development 3. Amazon S3 usage in applications
Troubleshooting and Optimization	18%	- Monitoring and logging 1. Amazon CloudWatch metrics and logs - Performance optimization 1. Fault tolerance and resilience patterns 2. Application performance tuning
Deployment	24%	- Infrastructure as code 1. AWS CloudFormation templates - CI/CD and deployment strategies 1. AWS CodePipeline workflows 2. AWS CodeBuild and CodeDeploy usage

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Amazon AWS Certified Developer - Associate Sample Questions (Q141-Q146):

NEW QUESTION # 141
A company is using Amazon OpenSearch Service to implement an audit monitoring system. A developer needs to create an AWS Cloudformation custom resource that is associated with an AWS Lambda function to configure the OpenSearch Service domain. The Lambda function must access the OpenSearch Service domain by using Open Search Service internal master user credentials.
What is the MOST secure way to pass these credentials to the Lambdas function?

A. Use CloudFoimalion to create an AWS Secrets Manager Secret. Use a CloudFormation dynamic reference to retrieve the secret's value for the OpenSearch Service domain's MasterUserOptions. Create an 1AM role that has the secrets manager. GetSecretvalue permission. Assign the role to the Lambda Function Store the secrets name as the Lambda function's environment variable. Resole the secret's value at runtime.
B. Use a CloudFormation parameter to pass the master user credentials at deployment to the OpenSearch Service domain's MasterUserOptions and to create a parameter. In AWS Systems Manager Parameter Store. Set the No Echo attribute to true. Create an 1AM role that has the ssm GetParameter permission.
Assign me role to the Lambda function. Store me parameter name as the Lambda function's environment variable. Resolve the parameter's value at runtime.
C. Use a CloudFormation parameter to pass the master user credentials at deployment to the OpenSearch Service domain's MasterUserOptions and the Lambda function's environment variable. Set the No Echo attenuate to true.
D. Use a CloudFormation parameter to pass the master uses credentials at deployment to the OpenSearch Service domain's MasterUserOptions and the Lambda function's environment varleWe Encrypt the parameters value by using the AWS Key Management Service (AWS KMS) encrypt command.

Answer: A

Explanation:
Explanation
The solution that will meet the requirements is to use CloudFormation to create an AWS Secrets Manager secret. Use a CloudFormation dynamic reference to retrieve the secret's value for the OpenSearch Service domain's MasterUserOptions. Create an IAM role that has the secretsmanager:GetSecretValue permission.
Assign the role to the Lambda function. Store the secret's name as the Lambda function's environment variable. Resolve the secret's value at runtime. This way, the developer can pass the credentials to the Lambda function in a secure way, as AWS Secrets Manager encrypts and manages the secrets. The developer can also use a dynamic reference to avoid exposing the secret's value in plain text in the CloudFormation template. The other options either involve passing the credentials as plain text parameters, which is not secure, or encrypting them with AWS KMS, which is less convenient than using AWS Secrets Manager.

NEW QUESTION # 142
A developer is creating an application that includes an Amazon API Gateway REST API in the us-east-2 Region. The developer wants to use Amazon CloudFront and a custom domain name for the API. The developer has acquired an SSL/TLS certificate for the domain from a third-party provider.
How should the developer configure the custom domain for the application?

A. Import the SSL/TLS certificate into AWS Certificate Manager (ACM) in the us-east-1 Region. Create a DNS CNAME record for the custom domain.
B. Import the SSL/TLS certificate into AWS Certificate Manager (ACM) in the same Region as the API.
Create a DNS CNAME record for the custom domain.
C. Import the SSL/TLS certificate into CloudFront. Create a DNS CNAME record for the custom domain.
D. Import the SSL/TLS certificate into AWS Certificate Manager (ACM) in the same Region as the API.
Create a DNS A record for the custom domain.

Answer: A

Explanation:
Amazon API Gateway is a service that enables developers to create, publish, maintain, monitor, and secure APIs at any scale. Amazon CloudFront is a content delivery network (CDN) service that can improve the performance and security of web applications. The developer can use CloudFront and a custom domain name for the API Gateway REST API. To do so, the developer needs to import the SSL/TLS certificate into AWS Certificate Manager (ACM) in the us-east-1 Region. This is because CloudFront requires certificates from ACM to be in this Region. The developer also needs to create a DNS CNAME record for the custom domain that points to the CloudFront distribution.
References:
* [What Is Amazon API Gateway? - Amazon API Gateway]
* [What Is Amazon CloudFront? - Amazon CloudFront]
* [Custom Domain Names for APIs - Amazon API Gateway]

NEW QUESTION # 143
A company is developing a serverless application that consists of various AWS Lambda functions behind Amazon API Gateway APIs. A developer needs to automate the deployment of Lambda function code. The developer will deploy updated Lambda functions with AWS CodeDeploy. The deployment must minimize the exposure of potential errors to end users. When the application is in production, the application cannot experience downtime outside the specified maintenance window. Which deployment configuration will meet these requirements with the LEAST deployment time?

A. Use the AWS CodeDeploy in-place deployment configuration for the Lambda functions. Shift all traffic immediately after deployment.
B. Use the AWS CodeDeploy predefined canary deployment configuration to shift 10% of the traffic immediately and shift the remaining traffic after 5 minutes.
C. Use the AWS CodeDeploy linear deployment configuration to shift 10% of the traffic every minute.
D. Use the AWS CodeDeploy all-at-once deployment configuration to shift all traffic to the updated versions immediately.

Answer: B

Explanation:
The AWS CodeDeploy predefined canary deployment configuration shifts 10% of traffic immediately, then shifts the remaining 90% after 5 minutes. This approach helps minimize the exposure of errors to users while ensuring fast rollback if needed, and provides a short overall deployment time. It balances speed and safety, making it ideal for production environments with limited downtime windows.

NEW QUESTION # 144
A developer created a Node.js-based AWS Lambda function by using a container image of an AWS OS-only base image. There is a new security patch for Node.js that must be patched to the new Lambda function.
Which solution will meet this requirement?

A. Rebuild the Lambda container code with the latest Node.js patch version. Publish a new version of the Lambda function.
B. Rebuild the Lambda container code with the latest version of the AWS OS base image. Publish a new version of the Lambda function.
C. Patch the runtime version by redeploying the same version of the Lambda function.
D. Set the runtime update mode of the Lambda function to Auto.

Answer: A

Explanation:
Comprehensive Detailed Explanation with all AWS References
* Why Option D is Correct:When using a container-based AWS Lambda function, you are responsible for updating the base image for runtime patches. Rebuilding the container with the latest Node.js patch version ensures the function is updated with the required security patches. Publishing a new version of the Lambda function makes the updated image available for use.
* Why Other Options are Incorrect:
* Option A: The runtime update mode applies to functions using AWS-managed runtimes, not container-based runtimes.
* Option B: Redeploying the same version of the Lambda function does not apply the security patch.
* Option C: Rebuilding with the AWS OS base image does not guarantee that the latest Node.js patch version is included.
* AWS Documentation References:
* Lambda Function Container Images
* Node.js Updates in AWS Lambda

NEW QUESTION # 145
A developer is creating an application that reads and writes to multiple Amazon S3 buckets. The application will be deployed to an Amazon EC2 instance. The developer wants to make secure API requests from the EC2 instances without the need to manage the security credentials for the application. The developer needs to apply the principle of least privilege.
Which solution will meet these requirements?

A. Create a bucket policy on the S3 bucket that allows s3:ListBucket and s3:*Object permissions to the EC2 instance.
B. Associate the EC2 instance with an IAM role that has an AmazonS3FullAccess AWS managed policy.
C. Associate the EC2 instance with an IAM role that has an IAM policy that allows s3:ListBucket and s3:*Object permissions for specific S3 buckets.
D. Create an IAM user. Create access keys and secret keys for the user. Associate the user with an IAM policy that allows s3:* permissions.

Answer: C

NEW QUESTION # 146
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