DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 an API using Amazon API Gateway and AWS Lambda. The API must authenticate users using a third-party OAuth 2.0 provider. Which THREE components are required to implement this authentication?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The OAuth 2.0 access token in the Authorization header
Option A, B, and D are required. A Lambda authorizer can validate tokens from a third-party OAuth provider. The token must be included in the request header. API Gateway invokes the Lambda authorizer. Option C (Cognito user pool) is not required if using a third-party provider. Option E (CloudFront) is not needed for authentication.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The OAuth 2.0 access token in the Authorization header
Why this is correct
The token is passed in the header for validation.
Related concept
Authentication checks who the user is.
✗
Amazon CloudFront distribution for API caching
Why it's wrong here
CloudFront is not required for authentication.
✓
An API Gateway resource policy that invokes the Lambda authorizer
Why this is correct
API Gateway must be configured to use the authorizer.
Related concept
Authentication checks who the user is.
✓
An AWS Lambda authorizer function
Why this is correct
Lambda authorizer validates the OAuth token.
Related concept
Authentication checks who the user is.
✗
An Amazon Cognito user pool as the OAuth provider
Why it's wrong here
Third-party provider is used, not Cognito.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DVA-C02 questions on access control and AAA configuration.
Development with AWS Services — This question tests Development with AWS Services — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The OAuth 2.0 access token in the Authorization header — Option A, B, and D are required. A Lambda authorizer can validate tokens from a third-party OAuth provider. The token must be included in the request header. API Gateway invokes the Lambda authorizer. Option C (Cognito user pool) is not required if using a third-party provider. Option E (CloudFront) is not needed for authentication.
What should I do if I get this DVA-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DVA-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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