This DVA-C02 practice question tests your understanding of development with aws services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A REST API requires request validation before invoking Lambda to reduce unnecessary function executions for malformed payloads. Where should validation be configured?
Inside the Lambda timeout setting
Why wrong: This does not meet the stated requirement as directly as the correct option.
In the IAM execution role
Why wrong: This does not meet the stated requirement as directly as the correct option.
In the S3 bucket policy
Why wrong: This does not meet the stated requirement as directly as the correct option.
In API Gateway request models and validators
Correct for the stated requirement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
In API Gateway request models and validators
API Gateway provides built-in request validation using models (JSON Schema) and validators. By configuring validation at the API Gateway layer, malformed payloads are rejected before they reach the Lambda function, reducing unnecessary invocations and associated costs. This is the correct approach because API Gateway acts as the entry point for REST APIs and can enforce payload structure without invoking the backend.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Inside the Lambda timeout setting
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
In the IAM execution role
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
In the S3 bucket policy
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
In API Gateway request models and validators
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse Lambda's execution role or timeout settings with request validation, not realizing that API Gateway is the correct layer to filter malformed payloads before they trigger Lambda.
Detailed technical explanation
API Gateway request validation uses models defined in JSON Schema draft-04 to specify required fields, data types, and constraints. When validation is enabled, API Gateway checks the request body and parameters against the model before routing to the integration, returning a 400 Bad Request with validation errors if the payload is invalid. This offloads validation from the Lambda function, reducing cold starts and execution costs for invalid requests.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Development with AWS Services — study guide chapter
Learn the concepts, then practise the questions
Development with AWS Services practice questions
Targeted practice on this topic area only
All DVA-C02 questions
1,616 questions across all exam domains
AWS Certified Developer Associate DVA-C02 study guide
Full concept coverage aligned to exam objectives
DVA-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise DVA-C02 questions linked to Development with AWS Services.
Practise DVA-C02 questions linked to Security.
Practise DVA-C02 questions linked to Deployment.
Practise DVA-C02 questions linked to Troubleshooting and Optimization.
Practise DVA-C02 questions linked to DVA-C02 fundamentals.
Practise DVA-C02 questions linked to DVA-C02 scenario.
Practise DVA-C02 questions linked to DVA-C02 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: In API Gateway request models and validators — API Gateway provides built-in request validation using models (JSON Schema) and validators. By configuring validation at the API Gateway layer, malformed payloads are rejected before they reach the Lambda function, reducing unnecessary invocations and associated costs. This is the correct approach because API Gateway acts as the entry point for REST APIs and can enforce payload structure without invoking the backend.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 11, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.