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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q200-Q205):

NEW QUESTION # 200
A developer designed an application on an Amazon EC2 instance The application makes API requests to objects in an Amazon S3 bucket Which combination of steps will ensure that the application makes the API requests in the MOST secure manner? (Select TWO.)

A. Add the IAM role to an instance profile. Attach the instance profile to the EC2 instance.
B. Create an 1AM role that has permissions to the S3 bucket Assign the role to an 1AM group
C. Create an IAM user that has permissions to the S3 bucket. Add the user to an 1AM group
D. Store the credentials of the IAM user in the environment variables on the EC2 instance
E. Create an IAM role that has permissions to the S3 bucket

Answer: A,E

Explanation:
IAM Roles for EC2: IAM roles are the recommended way to provide AWS credentials to applications running on EC2 instances. Here's how this works:
You create an IAM role with the necessary permissions to access the target S3 bucket.
You create an instance profile and associate the IAM role with this profile.
When launching the EC2 instance, you attach this instance profile.
Temporary Security Credentials: When the application on the EC2 instance needs to access S3, it doesn't directly use access keys. Instead, the AWS SDK running on the instance retrieves temporary security credentials associated with the role. These are rotated automatically by AWS.
Reference:
IAM Roles for Amazon EC2: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2.html Temporary Security Credentials: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp.html

NEW QUESTION # 201
An application uses Lambda functions to extract metadata from files uploaded to an S3 bucket; the metadata is stored in Amazon DynamoDB. The application starts behaving unexpectedly, and the developer wants to examine the logs of the Lambda function code for errors.
Based on this system configuration, where would the developer find the logs?

A. Amazon CloudWatch
B. AWS CloudTrail
C. Amazon DynamoDB
D. Amazon S3

Answer: A

Explanation:
Explanation
Amazon CloudWatch is the service that collects and stores logs from AWS Lambda functions. The developer can use CloudWatch Logs Insights to query and analyze the logs for errors and metrics. Option A is not correct because Amazon S3 is a storage service that does not store Lambda function logs. Option B is not correct because AWS CloudTrail is a service that records API calls and events for AWS services, not Lambda function logs. Option D is not correct because Amazon DynamoDB is a database service that does not store Lambda function logs.
References: AWS Lambda Monitoring, [CloudWatch Logs Insights]

NEW QUESTION # 202
A developer has an application that is composed of many different AWS Lambda functions. The Lambda functions all use some of the same dependencies. To avoid security issues the developer is constantly updating the dependencies of all of the Lambda functions. The result is duplicated effort to reach function.
How can the developer keep the dependencies of the Lambda functions up to date with the LEAST additional complexity?

A. Upgrade the Lambda functions to the most recent runtime version.
B. Use an AWS CodeCommit repository to host the dependencies in a centralized location.
C. Define a maintenance window for the Lambda functions to ensure that the functions get updated copies of the dependencies.
D. Define a Lambda layer that contains all of the shared dependencies.

Answer: D

Explanation:
This solution allows the developer to keep the dependencies of the Lambda functions up to date with the least additional complexity because it eliminates the need to update each function individually. A Lambda layer is a ZIP archive that contains libraries, custom runtimes, or other dependencies. The developer can create a layer that contains all of the shared dependencies and attach it to multiple Lambda functions. When the developer updates the layer, all of the functions that use the layer will have access to the latest version of the dependencies.

NEW QUESTION # 203
A company has a multi-node Windows legacy application that runs on premises. The application uses a network shared folder as a centralized configuration repository to store configuration files in .xml format. The company is migrating the application to Amazon EC2 instances. As part of the migration to AWS, a developer must identify a solution that provides high availability for the repository.
Which solution will meet this requirement MOST cost-effectively?

A. Deploy a micro EC2 instance with an instance store volume. Use the host operating system to share a folder. Update the application code to read and write configuration files from the shared folder.
B. Create an Amazon S3 bucket to host the repository. Migrate the existing .xml files to the S3 bucket.
Update the application code to use the AWS SDK to read and write configuration files from Amazon S3.
C. Create an Amazon S3 bucket to host the repository. Migrate the existing .xml files to the S3 bucket.
Mount the S3 bucket to the EC2 instances as a local volume. Update the application code to read and write configuration files from the disk.
D. Mount an Amazon Elastic Block Store (Amazon EBS) volume onto one of the EC2 instances. Deploy a file system on the EBS volume. Use the host operating system to share a folder. Update the application code to read and write configuration files from the shared folder.

Answer: B

Explanation:
Explanation
Amazon S3 is a service that provides highly scalable, durable, and secure object storage. The developer can create an S3 bucket to host the repository and migrate the existing .xml files to the S3 bucket. The developer can update the application code to use the AWS SDK to read and write configuration files from S3. This solution will meet the requirement of high availability for the repository in a cost-effective way.
References:
[Amazon Simple Storage Service (S3)]
[Using AWS SDKs with Amazon S3]

NEW QUESTION # 204
Users are reporting errors in an application. The application consists of several micro services that are deployed on Amazon Elastic Container Serves (Amazon ECS) with AWS Fargate.
When combination of steps should a developer take to fix the errors? (Select TWO)

A. Deploy AWS X-Ray as a daemon set to the Fargate cluster. Update the service role policy to allow access to the X-Ray API.
B. Deploy AWS X-Ray as a sidecar container to the micro services. Update the task role policy to allow access to me X -Ray API.
C. Instrument the ECS task to send the stout and spider- output to Amazon CloudWatch Logs. Update the task role policy to allow the cloudwatch Putlogs action.
D. Instrument the application by using the AWS X-Ray SDK. Update the application to use the Put- XrayTrace API call to communicate with the X-Ray API.
E. Instrument the application by using the AWS X-Ray SDK. Update the application to communicate with the X-Ray daemon.

Answer: B,C

Explanation:
The combination of steps that the developer should take to fix the errors is to deploy AWS X-Ray as a sidecar container to the microservices and instrument the ECS task to send the stdout and stderr output to Amazon CloudWatch Logs. This way, the developer can use AWS X-Ray to analyze and debug the performance of the microservices and identify any issues or bottlenecks. The developer can also use CloudWatch Logs to monitor and troubleshoot the logs from the ECS task and detect any errors or exceptions. The other options either involve using AWS X-Ray as a daemon set, which is not supported by Fargate, or using the PutTraceSegments API call, which is not necessary when using a sidecar container.
Reference: Using AWS X-Ray with Amazon ECS

NEW QUESTION # 205
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