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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q659-Q664):

NEW QUESTION # 659
A developer received the following error message during an AWS CloudFormation deployment:
DELETE_FAILED (The following resource(s) failed to delete: [ASGInstanceRole12345678].) Which action should the developer take to resolve this error?

A. Add a force parameter when calling CloudFormation with the role-arn of ASGInstanceRole12345678.
B. Modify the CloudFormation template to retain the ASGInstanceRole12345678 resource. Then manually delete the resource after deployment.
C. Add a DependsOn attribute to the ASGInstanceRole12345678 resource in the CloudFormation template. Then delete the stack.
D. Contact AWS Support to report an issue with the Auto Scaling Groups (ASG) service.

Answer: B

NEW QUESTION # 660
An ecommerce application is running behind an Application Load Balancer. A developer observes some unexpected load on the application during non-peak hours. The developer wants to analyze patterns for the client IP addresses that use the application. Which HTTP header should the developer use for this analysis?

A. The X-Forwarded-For header
B. The X-Forwarded-Proto header
C. The X-Forwarded-Port header
D. The X-F Forwarded-Host header

Answer: A

Explanation:
The HTTP header that the developer should use for this analysis is the X-Forwarded-For header. This header contains the IP address of the client that made the request to the Application Load Balancer. The developer can use this header to analyze patterns for the client IP addresses that use the application. The other headers either contain information about the protocol, host, or port of the request, which are not relevant for the analysis.
Reference: How Application Load Balancer works with your applications

NEW QUESTION # 661
A developer has a legacy application that is hosted on-premises. Other applications hosted on AWS depend on the on-premises application for proper functioning. In case of any application errors, the developer wants to be able to use Amazon CloudWatch to monitor and troubleshoot all applications from one place.
How can the developer accomplish this?

A. Install an AWS SDK on the on-premises server to automatically send logs to CloudWatch.
B. Download the CloudWatch agent to the on-premises server. Configure the agent to use IAM user credentials with permissions for CloudWatch.
C. Upload log files from the on-premises server to Amazon S3 and have CloudWatch read the files.
D. Upload log files from the on-premises server to an Amazon EC2 instance and have the instance forward the logs to CloudWatch.

Answer: B

Explanation:
Explanation
Amazon CloudWatch is a service that monitors AWS resources and applications. The developer can use CloudWatch to monitor and troubleshoot all applications from one place. To do so, the developer needs to download the CloudWatch agent to the on-premises server and configure the agent to use IAM user credentials with permissions for CloudWatch. The agent will collect logs and metrics from the on-premises server and send them to CloudWatch.
References:
[What Is Amazon CloudWatch? - Amazon CloudWatch]
[Installing and Configuring the CloudWatch Agent - Amazon CloudWatch]

NEW QUESTION # 662
A developer is creating an application for a company. The application needs to read the file doc.txt that is placed in the root folder of an Amazon S3 bucket that is named DOC-EXAMPLE- BUCKET. The company's security team requires the principle of least privilege to be applied to the application's IAM policy.
Which IAM policy statement will meet these security requirements?

Answer: D

NEW QUESTION # 663
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 a NAT gateway and a security group for the Lambda functions.
B. Configure the VPC, subnets, and a security group for the Lambda functions.
C. Configure the DB cluster's public access setting to Yes.
D. Configure an Amazon RDS database proxy for the Lambda functions.

Answer: B

Explanation:
This solution will meet the requirements by allowing the Lambda functions to access the DB cluster securely within the same VPC without crossing the public internet. The developer can configure a VPC endpoint for RDS in a private subnet and assign it to the Lambda functions. The developer can also configure a security group forthe Lambda functions that allows inbound traffic from the DB cluster on port 3306 (MySQL).
Option A is not optimal because it will expose the DB cluster to public access, which may compromise its security and data integrity. Option B is not optimal because it will introduce additional latency and complexity to use an RDS database proxy for accessing the DB cluster from Lambda functions within the same VPC. Option C is not optimal because it will require additional costs and configuration to use a NAT gateway for accessing resources in private subnets from Lambda functions.

NEW QUESTION # 664
......

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