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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Deployment	24%	- CI/CD and deployment strategies 1. AWS CodeBuild and CodeDeploy usage 2. AWS CodePipeline workflows - Infrastructure as code 1. AWS CloudFormation templates
Topic 2: 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 S3 usage in applications 2. Amazon DynamoDB integration patterns 3. AWS Lambda functions development
Topic 3: 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
Topic 4: Security	26%	- Application authentication and authorization 1. IAM roles and policies 2. Cognito user authentication - Data security 1. Secure API access patterns 2. Encryption using AWS KMS

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Amazon AWS Certified Developer - Associate Sample Questions (Q667-Q672):

NEW QUESTION # 667
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. Upload log files from the on-premises server to Amazon S3 and have CloudWatch read the files.
B. Install an AWS SDK on the on-premises server to automatically send logs to CloudWatch.
C. Upload log files from the on-premises server to an Amazon EC2 instance and have the instance forward the logs to CloudWatch.
D. Download the CloudWatch agent to the on-premises server. Configure the agent to use IAM user credentials with permissions for CloudWatch.

Answer: D

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 # 668
A developer is deploying an application on Amazon EC2 instances that run in Account A. In certain cases, this application needs to read data from a private Amazon S3 bucket in Account B. The developer must provide the application access to the S3 bucket without exposing the S3 bucket to anyone else.
Which combination of actions should the developer take to meet these requirements? (Select TWO.)

A. Configure the bucket policy in Account B to grant permissions to the instance profile role.
B. Update the instance profile IAM role in Account A with S3 read permissions.
C. Make the S3 bucket public with limited access for Account A.
D. Create an IAM role with S3 read permissions in Account B.
E. Add a trust policy that allows s3:Get* permissions to the IAM role in Account B.

Answer: A,D

Explanation:
This is a classic cross-account S3 access requirement: EC2 instances in Account A must read from a private S3 bucket in Account B without making the bucket public.
The correct pattern is to grant access using IAM + S3 bucket policy while keeping the bucket private. In Account B, you create an IAM role that has the necessary S3 read permissions (such as s3:GetObject and potentially s3:ListBucket depending on access needs). That is Option A.
However, permissions on the role alone are not sufficient, because the S3 bucket is in a different account and is private by default. AWS requires that the bucket owner explicitly grants access to the external principal.
This is done by adding a bucket policy in Account B that allows the principal (either the role in Account A or a role session via STS) to access the bucket objects. That is Option D.
Option B is not correct in the "select two" sense because adding permissions to Account A's instance profile role does not, by itself, grant access to a bucket owned by Account B. You still need the bucket policy or another resource-based policy from the bucket owner.
Option C violates the requirement ("without exposing the S3 bucket to anyone else"). Making the bucket public is unnecessary and insecure.
Option E is incorrect because a trust policy controls who can assume a role (sts:AssumeRole), not what S3 permissions the role has. Also, trust policies do not grant s3:Get* access.
Therefore, create an IAM role with S3 read permissions in Account B and grant access via the Account B bucket policy.

NEW QUESTION # 669
A developer is building an application that invokes AWS Lambda functions asynchronously to process events. The developer notices that a Lambda function fails to process some events at random times. The developer needs to investigate the failed events and capture the events that the Lambda function fails to process.
Which solution will meet these requirements?

A. Configure the Lambda function with an Amazon Simple Queue Service (Amazon SQS) FIFO dead-letter queue. Update the Lambda function's execution role with the required permissions.
B. Add an Amazon EventBridge rule for the Lambda function. Configure the EventBridge rule to react to failed events and to store the events in an Amazon DynamoDB table.
C. Configure the Lambda function with a dead-letter queue based in Amazon Kinesis. Update the Lambda function's execution role with the required permissions.
D. Configure the Lambda function with an Amazon Simple Queue Service (Amazon SQS) dead- letter queue. Update the Lambda function's execution role with the required permissions.

Answer: C

NEW QUESTION # 670
A company is developing an application that will be accessed through the Amazon API Gateway REST API. Registered users should be the only ones who can access certain resources of this API. The token being used should expire automatically and needs to be refreshed periodically.
How can a developer meet these requirements?

A. Create an Amazon Cognito identity pool, configure the Amazon Cognito Authorizer in API Gateway, and use the temporary credentials generated by the identity pool.
B. Create an IAM user for each API user, attach an invoke permissions policy to the API, and use an IAM authorizer in API Gateway.
C. Create and maintain a database record for each user with a corresponding token and use an AWS Lambda authorizer in API Gateway.
D. Create an Amazon Cognito user pool, configure the Cognito Authorizer in API Gateway, and use the identity or access token.

Answer: D

NEW QUESTION # 671
A real-time messaging application uses Amazon API Gateway WebSocket APIs with backend HTTP service.
A developer needs to build a feature in the application to identify a client that keeps connecting to and disconnecting from the WebSocket connection. The developer also needs the ability to remove the client Which combination of changes should the developer make to the application to meet these requirements?
(Select TWO.)

A. Switch to HTTP APIs in the backend service.
B. Add code to track the client status in Amazon ElastiCache in the backend service.
C. Use the callback URL to disconnect the client from the backend service.
D. Implement $connect and $disconnect routes in the backend service.
E. Switch to REST APIs in the backend service.

Answer: B,D

Explanation:
Requirement Summary:
* WebSocket-based messaging app usingAPI Gateway WebSocket APIs
* Need to:
* Identify clients repeatedlyconnecting/disconnecting
* Be able toremoveproblematic clients
Evaluate Options:
A: Switch to HTTP APIs
* #HTTP APIs don't supportWebSocketconnections
B: Switch to REST APIs
* #REST APIs arenot compatiblewith WebSockets
#C. Use the callback URL to disconnect clients
* ##Possible, butnot a direct option
* Callback URLs are used forsending messages to connected clients, not for disconnecting
#D. Track client status in ElastiCache
* #Good solution: Store and update connection state (connected, disconnected, timestamps)
* Helpstrack abuse or reconnections
#E. Implement $connect and $disconnect routes
* #Required to captureconnection lifecycle events
* These can be used to log/store client behavior and decide on removal
* WebSocket routes in API Gateway: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-route-selection.html
* Managing WebSocket connections: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-mapping-template-reference.html

NEW QUESTION # 672
......

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