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Amazon DVA-C02 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Security	26%	- Secure application data 1. Implement encryption at rest and in transit 2. Manage secrets and credentials securely - Implement authentication and authorization 1. Use Amazon Cognito for identity management 2. Manage IAM roles, policies, and permissions - Apply security best practices 1. Validate application security configurations 2. Follow AWS Well-Architected Framework security principles
Topic 2: Deployment	24%	- Implement CI/CD pipelines 1. Automate deployment and testing workflows 2. Use AWS CodePipeline, CodeBuild, CodeDeploy - Deploy applications on AWS 1. Deploy to AWS Lambda, Amazon EC2, Elastic Beanstalk 2. Perform safe updates and rollbacks - Prepare application artifacts for deployment 1. Use infrastructure as code (AWS CloudFormation, AWS SAM) 2. Package code and dependencies
Topic 3: Troubleshooting and Optimization	18%	- Optimize application performance 1. Optimize resource usage and costs 2. Improve latency and throughput - Troubleshoot application issues 1. Use Amazon CloudWatch, AWS X-Ray for monitoring 2. Analyze logs, metrics, and traces - Debug and resolve errors 1. Identify and fix code defects 2. Resolve integration and configuration problems
Topic 4: Development with AWS Services	32%	- Interact with AWS data services 1. Implement caching and data storage strategies 2. Work with Amazon DynamoDB, Amazon S3 - Write code for applications hosted on AWS 1. Implement architectural patterns 2. Use AWS SDKs and APIs 3. Develop serverless applications - Integrate AWS services into applications 1. Use AWS Lambda, API Gateway, Amazon EventBridge 2. Implement messaging and event-driven workflows

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Amazon AWS Certified Developer - Associate Sample Questions (Q723-Q728):

NEW QUESTION # 723
A company is developing a new ecommerce platform on AWS. The company wants to implement an event-driven architecture for the company's order processing system. The system needs to perform the following steps when a customer places an order:
1. Update inventory in the company's warehouse management system
2. Send a confirmation email message to the customer
3. Notify the company's shipping department to prepare the customer's
package
4. Update the customer's order history
A developer at the company wants to ensure loose coupling between services so that the company can easily add new steps in future.
Which solution will meet these requirements?

A. Use Amazon SQS to create a queue for orders. Configure an AWS Lambda function to process the queue and to directly call the APIs for each order processing step.
B. Configure the order processing system to publish an event for each order that is placed to an Amazon EventBridge event bus. Set up separate rules and targets for each order processing step.
C. Use Amazon SNS to publish order events. Create a separate subscription for each order processing step. Configure an AWS Lambda function to process each subscription.
D. Use AWS Step Functions to orchestrate the workflow. Configure an AWS Lambda function for each step in the process to directly invoke the API for each order processing step.

Answer: B

Explanation:
Amazon EventBridge supports event-driven architectures with loose coupling by allowing the order system to publish an order event to an event bus. Separate rules and targets can independently handle inventory updates, customer emails, shipping notifications, and order history updates, while making it easy to add new processing steps later without changing the order publisher.

NEW QUESTION # 724
A company has an application that generates large binary data outside of AWS. The company must encrypt the data before uploading the data to an Amazon S3 bucket. Which solution will meet this requirement?

A. Configure server-side encryption on the S3 bucket.
B. Specify the x-amz-server-side-encryption header when uploading the data to the S3 bucket.
C. Use the AWS Encryption SDK to perform client-side encryption of the data.
D. Use the AWS KMS encrypt command in the AWS CLI.

Answer: C

Explanation:
The data must be encrypted before it is uploaded to Amazon S3, which requires client-side encryption. The AWS Encryption SDK is designed specifically for this purpose, allowing encryption to occur locally before transmission while integrating with AWS KMS for key management.

NEW QUESTION # 725
A company has an Amazon S3 bucket containing premier content that it intends to make available to only paid subscribers of its website. The S3 bucket currently has default permissions of all objects being private to prevent inadvertent exposure of the premier content to non-paying website visitors.
How can the company Limit the ability to download a premier content file in the S3 Bucket to paid subscribers only?

A. Apply a bucket policy that allows anonymous users to download the content from the S3 bucket.
B. Generate a pre-signed object URL for the premier content file when a pad subscriber requests a download.
C. Add a Docket policy that requires multi-factor authentication for request to access the S3 bucket objects.
D. Enable server-side encryption on the S3 bucket for data protection against the non-paying website visitors.

Answer: B

Explanation:
This solution will limit the ability to download a premier content file in the S3 bucket to paid subscribers only because it uses a pre-signed object URL that grants temporary access to an S3 object for a specified duration. The pre-signed object URL can be generated by the company's website when a paid subscriber requests a download, and can be verified by Amazon S3 using the signature in the URL. Option A is not optimal because it will allow anyone to download the content from the S3 bucket without verifying their subscription status. Option C is not optimal because it will require additional steps and costs to configure multi-factor authentication for accessing the S3 bucket objects, which may not be feasible or user-friendly for paid subscribers. Option D is not optimal because it will not prevent non-paying website visitors from accessing the S3 bucket objects, but only encrypt them at rest.

NEW QUESTION # 726
A company uses Amazon API Gateway to expose a set of APIs to customers. The APIs have caching enabled in API Gateway. Customers need a way to invalidate the cache for each API when they test the API.
What should a developer do to give customers the ability to invalidate the API cache?

A. Attach an InvalidateCache policy to the IAM execution role that the customers use to invoke the API. Ask the customers to send a request that contains the Cache-Control:max-age=0 HTTP header when they make an API call.
B. Ask the customers to use the AWS SDK API Gateway class to invoke the InvalidateCache API operation.
C. Attach an InvalidateCache policy to the IAM execution role that the customers use to invoke the API. Ask the customers to add the INVALIDATE_CACHE query string parameter when they make an API call.
D. Ask the customers to use AWS credentials to call the InvalidateCache API operation.

Answer: A

Explanation:
https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-caching.html Invalidate an API Gateway Cache Entry A client of your API can invalidate an existing cache entry and reload it from the integration endpoint for individual requests. The client must send a request that contains the Cache-Control:
max-age=0 header. The client receives the response directly from the integration endpoint instead of the cache, provided that the client is authorized to do so. This replaces the existing cache entry with the new response, which is fetched from the integration endpoint.
To grant permission for a client, attach a policy of the following format to an IAM execution role for the user.

NEW QUESTION # 727
A developer has been asked to create an AWS Lambda function that is invoked any time updates are made to items in an Amazon DynamoDB table. The function has been created and appropriate permissions have been added to the Lambda execution role Amazon DynamoDB streams have been enabled for the table, but the function 15 still not being invoked.
Which option would enable DynamoDB table updates to invoke the Lambda function?

A. Change the StreamViewType parameter value to NEW_AND_OLOJMAGES for the DynamoDB table.
B. Configure event source mapping for the Lambda function.
C. Map an Amazon Simple Notification Service (Amazon SNS) topic to the DynamoDB streams.
D. Increase the maximum runtime (timeout) setting of the Lambda function.

Answer: B

Explanation:
This solution allows the Lambda function to be invoked by the DynamoDB stream whenever updates are made to items in the DynamoDB table. Event source mapping is a feature of Lambda that enables a function to be triggered by an event source, such as a DynamoDB stream, an Amazon Kinesis stream, or an Amazon Simple Queue Service (SQS) queue. The developer can configure event source mapping for the Lambda function using the AWS Management Console, the AWS CLI, or the AWS SDKs. Changing the StreamViewType parameter value to NEW_AND_OLD_IMAGES for the DynamoDB table will not affect the invocation of the Lambda function, but only change the information that is written to the stream record.
Mapping an Amazon Simple Notification Service (Amazon SNS) topic to the DynamoDB stream will not invoke the Lambda function directly, but require an additional subscription from the Lambda function to the SNS topic. Increasing the maximum runtime (timeout) setting of the Lambda function will not affect the invocation of the Lambda function, but only change how long the function can run before it is terminated.

NEW QUESTION # 728
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