A developer is building an API using Amazon API Gateway and AWS Lambda. The API accepts a JSON payload that includes a 'quantity' field, which must be a positive integer. If the field is missing or invalid, the API should return a 400 status code with a custom error message. The developer wants to implement this validation without adding extra Lambda invocations for invalid requests. What should the developer do?

Configure a Lambda authorizer to validate the request body and return a 400 if the quantity field is invalid.

Use an API Gateway mapping template to transform the payload and set the status code to 400 if validation fails.

Configure a request validator in API Gateway with a JSON schema that requires 'quantity' to be an integer with a minimum value of 1.

Write validation logic in the Lambda function that returns a 400 status code if the field is invalid.

Which benefit does loose coupling provide in an AWS architecture?

It allows components to evolve independently without requiring coordinated deployments.

It guarantees lower latency for synchronous requests.

It eliminates the need for error handling in application code.

It reduces the number of network calls between components.

AWSCertified Developer - Associate

Domain 1Objective 1

Task 1: Develop Code for Applications Hosted on AWS DVA-C02 Practice Questions (Page 5)

Part of the Content Domain 1: Development with AWS Services domain, which accounts for 32% of the DVA-C02 exam. AWS does not publish an official question count, but from its 130-minute exam (~50–85 total, ~16–27 in this domain), expect 5–9 from this objective — we provide 38 practice questions to prepare you well beyond it. (estimate)

38questions here

8free pages

13concepts

32%of the exam

Questions 21–25

21foundation · easy
Which AWS service is commonly used to achieve loose coupling between application components?
Select an answer first
22foundation · easy
Which API Gateway feature is used to validate request parameters and payloads before they reach the backend?
Select an answer first
23application · medium
A developer is building an API using Amazon API Gateway and AWS Lambda. The API accepts a JSON payload that includes a 'quantity' field, which must be a positive integer. If the field is missing or invalid, the API should return a 400 status code with a custom error message. The developer wants to implement this validation without adding extra Lambda invocations for invalid requests. What should the developer do?
Select an answer first
24foundation · easy
Which benefit does loose coupling provide in an AWS architecture?
Select an answer first
25foundation · easy
Which AWS service is designed for real-time streaming data ingestion and processing with shards?
Select an answer first

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Task 1: Develop Code for Applications Hosted on AWS DVA-C02 Practice Questions (Page 5)

Questions 21–25

Which AWS service is commonly used to achieve loose coupling between application components?

Which API Gateway feature is used to validate request parameters and payloads before they reach the backend?

Which benefit does loose coupling provide in an AWS architecture?

Which AWS service is designed for real-time streaming data ingestion and processing with shards?

Keep studying — Content Domain 1: Development with AWS Services