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Amazon AWS Certified Developer - Associate DVA-C02 Prüfungsfragen mit Lösungen (Q738-Q743):

738. Frage
A developer must cache dependent artifacts from Maven Central, a public package repository, as part of an application's build pipeline. The build pipeline has an AWS CodeArtifact repository where artifacts of the build are published. The developer needs a solution that requires minimum changes to the build pipeline.
Which solution meets these requirements?

A. Modify the existing CodeArtifact repository to associate an upstream repository with the public package repository.
B. Modify the CodeArtifact repository resource policy to allow artifacts to be fetched from the public package repository.
C. Create a new CodeArtifact domain that contains a new repository that has an external connection to the public package repository.
D. Create a new CodeArtifact repository that has an external connection to the public package repository.

Antwort: A

739. Frage
A developer is using an AWS Lambda function to generate avatars for profile pictures that are uploaded to an Amazon S3 bucket. The Lambda function is automatically invoked for profile pictures that are saved under the /original/ S3 prefix. The developer notices that some pictures cause the Lambda function to time out. The developer wants to implement a fallback mechanism by using another Lambda function that resizes the profile picture.
Which solution will meet these requirements with the LEAST development effort?

A. Create an AWS Step Functions state machine that invokes the avatar generator Lambda function and uses the image resize Lambda function as a fallback. Create an Amazon EventBridge rule that matches events from the S3 bucket to invoke the state machine.
B. Create an Amazon Simple Notification Service (Amazon SNS) topic. Set the SNS topic as a destination with an on failure condition for the avatar generator Lambda function. Subscribe the image resize Lambda function to the SNS topic.
C. Create an Amazon Simple Queue Service (Amazon SQS) queue. Set the SQS queue as a destination with an on failure condition for the avatar generator Lambda function. Configure the image resize Lambda function to poll from the SQS queue.
D. Set the image resize Lambda function as a destination of the avatar generator Lambda function for the events that fail processing.

Antwort: D

Begründung:
The solution that will meet the requirements with the least development effort is to set the image resize Lambda function as a destination of the avatar generator Lambda function for the events that fail processing.
This way, the fallback mechanism is automatically triggered by the Lambda service without requiring any additional components or configuration. The other options involve creating and managing additional resources such as queues, topics, state machines, or rules, which would increase the complexity and cost of the solution.

740. Frage
An application routinely processes large numbers of Amazon S3 GET requests each second. A developer wants to increase the number of requests that the application can handle in parallel. What should the developer do to achieve this goal?

A. Partition S3 objects by object prefixes.
B. Configure AWS Direct Connect for Amazon S3.
C. Move all S3 objects into a single object prefix.
D. Configure AWS Global Accelerator for Amazon S3.

Antwort: A

Begründung:
Amazon S3 performance scales automatically. Each prefix in an S3 bucket can handle at least 3,500 PUT
/COPY/POST/DELETE and 5,500 GET requests per second. There are no limits to the number of prefixes in a bucket. To increase parallel throughput, a developer should partition the data into multiple prefixes. This distributes the request load across multiple partitions of the S3 index, effectively scaling the performance of the application.

741. Frage
An ecommerce company operates a microservices-based application on AWS. The company updates an API for a payment-processing microservice in Amazon API Gateway. After the update, customers report intermittent HTTP 503 (Service Unavailable) error messages during checkout.
The company reviews error logs and notices elevated error rates. However, the logs do not provide enough detail to determine the specific cause of the failures. The company needs to determine the root cause of the errors.
Which solution will meet this requirement?

A. Use AWS X-Ray to generate a service map and to instrument critical logic with custom subsegments.
B. Collect Amazon CloudWatch logs from the payment-processing microservice. Filter for error keywords and stack traces.
C. Use AWS X-Ray to instrument the payment-processing microservice with the default sampling rate.
D. Set up an Amazon CloudWatch alarm based on the payment-processing microservice's 5xx error rate.

Antwort: A

Begründung:
AWS X-Ray provides end-to-end tracing that helps identify where requests are failing across distributed microservices. By generating a service map and adding custom subsegments around critical logic, the company can gain detailed visibility into downstream calls, latency, and specific failure points, enabling accurate root cause analysis of the intermittent 503 errors.

742. Frage
An application writes transactions to an Amazon DynamoDB table by using the PutItem operation. Each transaction has a unique transactionId. Sometimes duplicate transactions are received. The developer wants to ensure that a duplicate PutItem does not overwrite an existing item. Duplicate transactions are rare.
What is the MOST cost-effective solution?

A. Use a conditional put with attribute_not_exists(transactionId).
B. Call GetItem before calling PutItem.
C. Enable TTL on the table.
D. Use a conditional put with attribute_exists(transactionId).

Antwort: A

Begründung:
Amazon DynamoDB supports conditional writes, which allow developers to enforce data integrity rules directly at the database layer. AWS documentation states that conditional expressions are the recommended way to prevent accidental overwrites and ensure idempotent writes.
Using a PutItem operation with the condition expression
attribute_not_exists(transactionId) ensures that the write succeeds only if the item does not already exist. If a duplicate transaction is received, DynamoDB rejects the request without modifying the existing record.
This approach is highly cost-effective because it avoids additional read operations. Option A doubles request cost by performing a read before every write. TTL (Option B) is unrelated to overwrite prevention. Option C does the opposite of the requirement by ensuring the attribute exists.
AWS explicitly recommends conditional writes for handling duplicates and enforcing uniqueness with minimal cost and latency.
Therefore, implementing a conditional put with attribute_not_exists(transactionId) is the correct solution.

743. Frage
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