- A
Configure the API Gateway method to use the Lambda authorizer.
Associate the authorizer with the API method.
- B
Return a JSON Web Token (JWT) from the authorizer function.
Why wrong: Authorizer returns an IAM policy, not a token.
- C
Create a Lambda function that validates the token and returns an IAM policy.
The authorizer function must return a policy.
- D
Grant API Gateway permission to invoke the Lambda authorizer function.
Needed for API Gateway to call the authorizer.
- E
Generate an API key and distribute it to clients.
Why wrong: API keys are for usage plans, not Lambda authorizers.
Question 103 of 1,616
API Gateway Lambda Authorizer
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 developer is building a REST API using API Gateway and Lambda. The API must be secured using a Lambda authorizer. Which THREE steps are necessary to implement the Lambda authorizer? (Choose THREE.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the API Gateway method to use the Lambda authorizer.
Option A is correct because the API Gateway method must be explicitly configured to use the Lambda authorizer as the authorization mechanism. This is done by setting the method's Authorization type to the Lambda authorizer's logical name in the API Gateway console or via the REST API's `authorizationType` property set to `CUSTOM` and referencing the authorizer's ID. Without this configuration, API Gateway will not invoke the authorizer function for incoming requests.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the API Gateway method to use the Lambda authorizer.
Why this is correct
Associate the authorizer with the API method.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Return a JSON Web Token (JWT) from the authorizer function.
Why it's wrong here
Authorizer returns an IAM policy, not a token.
- ✓
Create a Lambda function that validates the token and returns an IAM policy.
Why this is correct
The authorizer function must return a policy.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Grant API Gateway permission to invoke the Lambda authorizer function.
Why this is correct
Needed for API Gateway to call the authorizer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Generate an API key and distribute it to clients.
Why it's wrong here
API keys are for usage plans, not Lambda authorizers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the token validation logic inside the authorizer with the output format, mistakenly thinking the authorizer returns a JWT or API key, when in fact it must return an IAM policy document for API Gateway to enforce authorization.
Detailed technical explanation
How to think about this question
Under the hood, a Lambda authorizer receives an `event` object containing the method ARN, headers, query parameters, and the token. The function must return a valid IAM policy (with `principalId`, `policyDocument`, and optionally `context`) to either allow or deny the request. A common real-world scenario is using a third-party OAuth provider: the authorizer validates the access token against the provider's JWKS endpoint and then generates a scoped IAM policy to restrict access to specific API resources.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Development with AWS Services — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the API Gateway method to use the Lambda authorizer. — Option A is correct because the API Gateway method must be explicitly configured to use the Lambda authorizer as the authorization mechanism. This is done by setting the method's Authorization type to the Lambda authorizer's logical name in the API Gateway console or via the REST API's `authorizationType` property set to `CUSTOM` and referencing the authorizer's ID. Without this configuration, API Gateway will not invoke the authorizer function for incoming requests.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 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.
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