The answer is a JWT authorizer configured for the OpenID Connect issuer. This is correct because API Gateway’s JWT authorizer natively validates JSON Web Tokens against the token issuer’s JWKS endpoint, verifying the signature and claims without requiring custom Lambda code. For the SAA-C03 exam, this scenario tests your understanding of managed authentication versus custom authorizers—a common trap is choosing a Lambda authorizer when a simpler, standards-based JWT authorizer suffices. Remember that any time an external OpenID Connect provider issues tokens, the JWT authorizer is the direct, low-maintenance solution. A useful memory tip: “JWT for OIDC, Lambda for custom logic”—if the tokens follow an open standard, let the managed service handle the validation.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 public API for a e-learning platform is deployed on API Gateway. Clients must authenticate with standards-based tokens issued by an external OpenID Connect provider. Which authorization mechanism should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
JWT authorizer configured for the OpenID Connect issuer
Option D is correct because API Gateway supports JWT authorizers that validate JSON Web Tokens (JWTs) issued by an external OpenID Connect (OIDC) provider. This allows the API to authenticate clients using standards-based tokens without managing a custom Lambda authorizer, and it directly integrates with the OIDC issuer's JWKS endpoint to verify token signatures.
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.
✗
A VPC endpoint policy
Why it's wrong here
Endpoint policies restrict private endpoint use, not public API user authentication.
✗
IAM authorization for all internet users
Why it's wrong here
IAM authorization is suited to AWS principals, not general OIDC-authenticated application users.
✗
API keys only
Why it's wrong here
API keys identify clients for usage plans but do not authenticate users securely.
✓
JWT authorizer configured for the OpenID Connect issuer
Why this is correct
A JWT authorizer validates tokens from a trusted OIDC issuer with low operational overhead.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse API keys (which only identify the caller for usage plans) with authentication mechanisms, or assume IAM authorization can validate third-party OIDC tokens, when in fact IAM authorization requires AWS credentials, not external tokens.
Detailed technical explanation
How to think about this question
The JWT authorizer in API Gateway automatically fetches and caches the OIDC provider's JSON Web Key Set (JWKS) to verify the token's signature, expiry, and issuer claim (iss). This eliminates the need for a custom Lambda authorizer for token validation, reducing latency and cost. In a real-world scenario, an e-learning platform using Auth0 or Okta as the OIDC provider can configure the JWT authorizer with the issuer URL (e.g., https://example.okta.com) and the audience claim 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.
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.
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: JWT authorizer configured for the OpenID Connect issuer — Option D is correct because API Gateway supports JWT authorizers that validate JSON Web Tokens (JWTs) issued by an external OpenID Connect (OIDC) provider. This allows the API to authenticate clients using standards-based tokens without managing a custom Lambda authorizer, and it directly integrates with the OIDC issuer's JWKS endpoint to verify token signatures.
What should I do if I get this SAA-C03 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.
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 →
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.
This SAA-C03 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 SAA-C03 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.