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Amazon DVA-C02 Exam Syllabus Topics:

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

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Amazon AWS Certified Developer - Associate Sample Questions (Q590-Q595):

NEW QUESTION # 590
A company has a two-tier application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The EC2 instances are in an Auto Scaling group. The Auto Scaling group is configured with a lifecycle hook that uses the default health checks for the EC2 instances.
During a recent change deployment, the ALB reported HTTP 502 errors. When a developer checked the target group, some of the EC2 instances were marked as unhealthy. However, the Auto Scaling group was not replacing the unhealthy EC2 instances.
Which configuration change should the developer make to replace the unhealthy EC2 instances?

A. Increase the cooldown period of the Auto Scaling group from its default value.
B. Update the lifecycle hook to wait for the application to install.
C. Set the health check grace period for the Auto Scaling group.
D. Update the Auto Scaling group's health check from Amazon EC2 to Elastic Load Balancing (ELB).

Answer: D

Explanation:
With the default Amazon EC2 health checks, the Auto Scaling group only replaces instances when the EC2 instance itself is impaired (for example, hardware or networking failure). If instances are failing ALB target group health checks (causing 502s) but are still "running" from EC2's perspective, Auto Scaling will not replace them. Changing the Auto Scaling group health check type to ELB makes Auto Scaling use the target group health status so it can automatically terminate and replace instances that the ALB marks as unhealthy.

NEW QUESTION # 591
A company is migrating an on-premises database to Amazon RDS for MySQL. The company has read-heavy workloads. The company wants to refactor the code to achieve optimum read performance for queries. Which solution will meet this requirement with LEAST current and future effort?

A. Use a multi-AZ Amazon RDS deployment. Modify the code so that queries access the secondary RDS instance.
B. Use open source replication software to create a copy of the MySQL database on an Amazon EC2 instance. Modify the application code so that queries use the IP address of the EC2 instance.
C. Deploy Amazon RDS with one or more read replicas. Modify the application code so that queries use the URL for the read replicas.
D. Use a multi-AZ Amazon RDS deployment. Increase the number of connections that the code makes to the database or increase the connection pool size if a connection pool is in use.

Answer: C

Explanation:
Amazon RDS read replicas are designed to scale read-heavy workloads by offloading read queries from the primary database instance. Directing read queries to the read replica endpoint improves read performance with minimal operational effort and provides a managed path to add more read capacity in the future.

NEW QUESTION # 592
A developer has an application that makes batch requests directly to Amazon DynamoDB by using the BatchGetItem low-level API operation. The responses frequently return values in the UnprocessedKeys element.
Which actions should the developer take to increase the resiliency of the application when the batch response includes values in UnprocessedKeys? (Choose two.)

A. Retry the batch operation immediately.
B. Retry the batch operation with exponential backoff and randomized delay.
C. Increase the provisioned read capacity of the DynamoDB tables that the operation accesses.
D. Update the application to use an AWS software development kit (AWS SDK) to make the requests.
E. Increase the provisioned write capacity of the DynamoDB tables that the operation accesses.

Answer: B,C

Explanation:
For B: "If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables" For D: "The most likely cause of a failed read or a failed write is throttling. For BatchGetItem, one or more of the tables in the batch request does not have enough provisioned read capacity to support the operation." Extracted from Error Handling Documentation:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html
#BatchOperations

NEW QUESTION # 593
A developer is building an application and wants to quickly test the effectiveness of a function before committing the code. Which solution will meet this requirement with the LEAST effort?

A. Highlight the function within the application code. Use the Amazon Q Developer agent to generate a unit test.
B. Add a report group that has test case information to the buildspec file of an AWS CodeBuild project.
C. Use Amazon Q Developer to review the code. Use the results of the review as context in a follow- up prompt to generate a unit test.
D. Add a report group that has test case information to the appspec file of an AWS CodeBuild project.

Answer: A

Explanation:
Amazon Q Developer can generate unit tests directly from selected code in the development environment. Highlighting the function and using the agent to generate a unit test provides the fastest way to validate the function before committing code.

NEW QUESTION # 594
A company wants to share information with a third party. The third party has an HTTP API endpoint that the company can use to share the information. The company has the required API key to access the HTTP API.
The company needs a way to manage the API key by using code. The integration of the API key with the application code cannot affect application performance.
Which solution will meet these requirements MOST securely?

A. Store the API credentials in a local code variable. Push the code to a secure Git repository. Use the local code variable at runtime to make the API call.
B. Store the API credentials in an Amazon DynamoDB table. Restrict access to the table by using resource-based policies. Retrieve the API credentials at runtime by using the AWS SDK. Use the credentials to make the API call.
C. Store the API credentials as an object in a private Amazon S3 bucket. Restrict access to the S3 object by using IAM policies. Retrieve the API credentials at runtime by using the AWS SDK. Use the credentials to make the API call.
D. Store the API credentials in AWS Secrets Manager. Retrieve the API credentials at runtime by using the AWS SDK. Use the credentials to make the API call.

Answer: D

Explanation:
AWS Secrets Manager is a service that helps securely store, rotate, and manage secrets such as API keys, passwords, and tokens. The developer can store the API credentials in AWS Secrets Manager and retrieve them at runtime by using the AWS SDK. This solution will meet the requirements of security, code management, and performance. Storing the API credentials in a local code variable or an S3 object is not secure, as it exposes the credentials to unauthorized access or leakage. Storing the API credentials in a DynamoDB table is also not secure, as it requires additional encryption and access control measures. Moreover, retrieving the credentials from S3 or DynamoDB may affect application performance due to network latency.
Reference:
[What Is AWS Secrets Manager? - AWS Secrets Manager]
[Retrieving a Secret - AWS Secrets Manager]

NEW QUESTION # 595
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