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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q470-Q475):

NEW QUESTION # 470
A development team is creating a serverless application that uses AWS Lambda functions. The team wants to streamline a testing workflow by sharing test events across multiple developers within the same AWS account. The team wants to ensure all developers can use consistent test events without compromising security.

A. Export test events as JSON files. Store the files in an Amazon S3 bucket. Configure granular IAM permissions to allow the developers to access the S3 bucket.
B. Set up a Git repository to store test events. Provide the developers with access to the repository.
C. Configure test events to be shareable. Configure granular IAM permissions to allow the developers to access shared test events.
D. Store test events in an Amazon DynamoDB table. Create an AWS Lambda function to retrieve shared test events for the developers.

Answer: A

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
* Option A: Use Amazon S3 for Shared Test Events:
* Storing JSON test event files in an S3 bucket provides a centralized, cost-effective, and highly available solution.
* Granular IAM policies can restrict access to specific developers or roles, ensuring security while maintaining consistency for shared test events.
* This solution has minimal operational overhead and integrates easily with existing workflows.
* Why Other Options Are Incorrect:
* Option B: Using DynamoDB and a Lambda function introduces unnecessary complexity for a relatively simple requirement. S3 provides a simpler and more cost-efficient solution.
* Option C: AWS Lambda test events are not inherently shareable across developers, making this option invalid.
* Option D: Using a Git repository adds operational overhead and requires developers to clone
/update repositories for access, which is more cumbersome compared to S3.
References:
* Amazon S3 for Centralized Storage

NEW QUESTION # 471
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 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.
B. 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.
C. 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.
D. 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.

Answer: C

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 # 472
A company regularly receives route status updates from its delivery trucks as events in Amazon EventBridge.
The company is building an API-based application in a VPC that will consume and process the events to create a delivery status dashboard. The API application must not be available by using public IP addresses because of security and compliance requirements.
How should the company send events from EventBridge to the API application?

A. Use the application API endpoint in the VPC as a target for EventBridge. Send events directly to the application API endpoint from EventBridge.
B. Create an internet-facing Network Load Balancer (NLB) in front of the API application. Associate a security group with rules that block access from all external sources except for EventBridge. Configure the NLB as an EventBridge target.
C. Create an AWS Lambda function that runs in the same VPC as the API application. Configure the function as an EventBridge target. Use the function to send events to the API.
D. Create an internet-facing Application Load Balancer (ALB) in front of the API application. Associate a security group with rules that block access from all external sources except for EventBridge. Configure the ALB as an EventBridge target.

Answer: C

Explanation:
Comprehensive Detailed Explanation with all AWS References
* Why Option A is Correct:Running an AWS Lambda function within the same VPC ensures secure communication without exposing the API application to public IP addresses. The Lambda function can serve as a secure EventBridge target to send events to the API.
* Why Other Options are Incorrect:
* Option B & C: Internet-facing load balancers expose public IP addresses, which violates compliance requirements.
* Option D: EventBridge cannot directly target an endpoint within a private VPC without intermediary services like Lambda.
* AWS Documentation References:
* EventBridge Targets

NEW QUESTION # 473
A developer runs an application that displays scores for sports games on Amazon EC2 instances.
The application uses a Redis client to retrieve the scores from an Amazon ElastiCache (Redis OSS) cluster. The developer observes increased latency during operations on the cache because of connection failures to the cluster. The developer needs to resolve the latency issues.
Which solution will meet this requirement?

A. Configure the Redis client to use an exponential backoff retry strategy to establish cache connections.
B. Configure the Redis client in the application to persist connections to the cluster by implementing a connection pool.
C. Deploy more nodes in the ElastiCache cluster. Update the Redis client to discover the new nodes.
D. Store the scores in the application's memory. Perform bulk set operations on the scores that are stored in memory.

Answer: B

Explanation:
Implementing a connection pool in the Redis client reduces connection overhead and avoids frequent connection establishment, which helps to reduce latency and connection failures.

NEW QUESTION # 474
A developer is migrating some features from a legacy monolithic application to use AWS Lambda functions instead. The application currently stores data in an Amazon Aurora DB cluster that runs in private subnets in a VPC. The AWS account has one VPC deployed. The Lambda functions and the DB cluster are deployed in the same AWS Region in the same AWS account.
The developer needs to ensure that the Lambda functions can securely access the DB cluster without crossing the public internet.
Which solution will meet these requirements?

A. Configure the DB cluster's public access setting to Yes.
B. Configure an Amazon RDS database proxy for he Lambda functions.
C. Configure a NAT gateway and a security group for the Lambda functions.
D. Configure the VPC, subnets, and a security group for the Lambda functions.

Answer: D

NEW QUESTION # 475
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