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Amazon DVA-C02 Certification Exam is designed for developers who are interested in validating their skills in AWS development. DVA-C02 exam is intended for individuals who have a strong understanding of AWS services and can develop, deploy, and debug cloud-based applications using AWS. AWS Certified Developer - Associate certification exam is a great way to demonstrate your expertise in AWS development and stand out to potential employers.

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Amazon AWS Certified Developer - Associate Sample Questions (Q583-Q588):

NEW QUESTION # 583
A developer is writing an application that stores data in an Amazon DynamoDB table by using the PutItem API operation. The table has a partition key of streamID and has a sort key of seqID. The developer needs to make sure that the PutItem invocation does not overwrite the existing partition key and sort key.
Which condition expression will maintain the uniqueness of the partition key and the sort key?

Answer: C

Explanation:
The correct condition expression is attribute_not_exists(streamID) AND attribute_not_exists(seqID). This prevents PutItem from overwriting an item that already has the same composite primary key. In DynamoDB, PutItem normally replaces an existing item with the same primary key unless a condition expression blocks the operation. The option must reference the actual partition key and sort key attribute names, not generic words like PARTITION or SORT. The attribute_exists function would do the opposite: it would only allow the operation when those attributes already exist, which does not preserve uniqueness. AWS DynamoDB documentation explains that condition expressions with attribute_not_exists are used to prevent replacing existing items, and for composite keys the partition and sort key checks are evaluated together. ( AWS Documentation )


NEW QUESTION # 584
A company needs to distribute firmware updates to its customers around the world.
Which service will allow easy and secure control of the access to the downloads at the lowest cost?

Answer: D

Explanation:
This solution allows easy and secure control of access to the downloads at the lowest cost because it uses a content delivery network (CDN) that can cache and distribute firmware updates to customers around the world, and uses a mechanism that can restrict access to specific files or versions. Amazon CloudFront is a CDN that can improve performance, availability, and security of web applications by delivering content from edge locations closer to customers. Amazon S3 is a storage service that can store firmware updates in buckets and objects. Signed URLs are URLs that include additional information, such as an expiration date and time, that give users temporary access to specific objects in S3 buckets. The developer can use CloudFront to serve firmware updates from S3 buckets and use signed URLs to control who can download them and for how long.
Creating a dedicated CloudFront distribution for each customer will incur unnecessary costs and complexity.
Using Amazon CloudFront with AWS Lambda@Edge will require additional programming overhead to implement custom logic at the edge locations. Using Amazon API Gateway and AWS Lambda to control access to an S3 bucket will also require additional programming overhead and may not provide optimal performance or availability.
Reference: [Serving Private Content through CloudFront], [Using CloudFront with Amazon S3]


NEW QUESTION # 585
A developer has created a new IAM user that has the s3:PutObject permission to write to a specific Amazon S3 bucket. The S3 bucket uses server-side encryption with AWS KMS-managed keys (SSE-KMS) as the default encryption. When an application uses the access key and secret key of the IAM user to call the PutObject API operation, the application receives an Access Denied error.
What should the developer do to resolve this error?

Answer: D

Explanation:
Comprehensive and Detailed Explanation (AWS Verified - 250-300 Words)
When an Amazon S3 bucket is configured with default encryption using SSE-KMS, AWS Key Management Service (KMS) plays an active role in every PutObject request. Although the IAM user already has the s3:
PutObject permission, this alone is not sufficient when SSE-KMS is enabled.
According to AWS documentation, when a client uploads an object to an S3 bucket encrypted with SSE- KMS, Amazon S3 must call AWS KMS on behalf of the caller to generate a unique data encryption key. This operation requires the kms:GenerateDataKey permission on the KMS key used for encryption. If this permission is missing, the PutObject request fails with an Access Denied error-even though S3 permissions appear correct.
AWS explicitly states that IAM principals uploading objects to SSE-KMS-encrypted buckets must be allowed to use the KMS key. At a minimum, the following KMS permissions are required:
* kms:GenerateDataKey
* (Implicitly) access allowed by the KMS key policy
Option C correctly resolves the issue by granting the IAM user permission to generate a data key via AWS KMS, enabling successful encryption during the upload process.
Option A is invalid because s3:EncryptionConfiguration is not required for object uploads.
Option B is unnecessary because the IAM user already has s3:PutObject.
Option D is incorrect because ACLs are not used to control KMS encryption permissions and are discouraged by AWS best practices.


NEW QUESTION # 586
A developer has written an AWS Lambda function. The function is CPU-bound. The developer wants to ensure that the function returns responses quickly.
How can the developer improve the function's performance?

Answer: D


NEW QUESTION # 587
A developer has created a data collection application that uses Amazon API Gateway, AWS Lambda, and Amazon S3. The application's users periodically upload data files and wait for the validation status to be reflected on a processing dashboard. The validation process is complex and time-consuming for large files.
Some users are uploading dozens of large files and have to wait and refresh the processing dashboard to see if the files have been validated. The developer must refactor the application to immediately update the validation result on the user's dashboard without reloading the full dashboard.
What is the MOST operationally efficient solution that meets these requirements?

Answer: D

Explanation:
The requirement is real-time UI updates "immediately" without refreshing the dashboard. The most operationally efficient AWS-native method is to use API Gateway WebSocket APIs to push updates from the backend to the browser.
With option A, the client establishes a WebSocket connection and receives a connection ID. The application can associate uploads (or job IDs) with that connection ID (commonly storing the mapping in DynamoDB or another datastore). When the long-running validation finishes, the backend uses the WebSocket management API to post a message to the specific connection ID, and the browser updates the UI dynamically. This eliminates polling/refresh and scales well without managing servers.
Option B requires running and maintaining an EC2-hosted WebSocket server (patching, scaling, uptime), which is more operational overhead.
Option C uses email, which is not immediate UI updating and doesn't update the dashboard without user action.
Option D is not appropriate: SNS does not directly push notifications to a web browser in a standard way, and it adds unnecessary complexity.
Therefore, using API Gateway WebSocket to push validation results to connected clients is the most operationally efficient solution.


NEW QUESTION # 588
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