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. A key principle to apply: jWT authorizers validate JSON Web Tokens issued by OpenID Connect providers.. 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 customer analytics portal 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? The design must avoid adding custom operational scripts.
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 B is correct because a JWT authorizer in API Gateway can validate tokens issued by an external OpenID Connect (OIDC) provider without requiring custom code. The JWT authorizer automatically verifies the token's signature, expiry, and issuer against the OIDC provider's JWKS endpoint, meeting the requirement for standards-based authentication and avoiding custom operational scripts.
Key principle: JWT authorizers validate JSON Web Tokens issued by OpenID Connect providers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
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
JWT authorizers validate JSON Web Tokens issued by OpenID Connect providers.
✗
IAM authorization for all internet users
Why it's wrong here
IAM authorization is suited to AWS principals, not general OIDC-authenticated application users.
✗
A VPC endpoint policy
Why it's wrong here
Endpoint policies restrict private endpoint use, not public API user authentication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse API keys (which are for rate limiting and usage plans, not authentication) with token-based authorization, or mistakenly think IAM authorization can be used for external users without AWS credentials.
Detailed technical explanation
How to think about this question
The JWT authorizer in API Gateway uses the OpenID Connect Discovery URL to fetch the JWKS (JSON Web Key Set) and automatically caches the public keys for token verification. It validates the token's `iss` (issuer), `aud` (audience), and `exp` (expiration) claims, and can optionally map claims to IAM policy context for fine-grained access control. This avoids the operational overhead of managing a custom Lambda authorizer or manual key rotation.
KKey Concepts to Remember
JWT authorizers validate JSON Web Tokens issued by OpenID Connect providers.
API Gateway offloads token validation, including signature, issuer, and expiration checks.
Configuration requires the OIDC issuer URL and optionally audience claims.
It avoids custom Lambda authorizer code for standard OIDC authentication.
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
JWT authorizers validate JSON Web Tokens issued by OpenID Connect providers.
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 jWT authorizers validate JSON Web Tokens issued by OpenID Connect providers., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Secure Architectures — This question tests Design Secure Architectures — JWT authorizers validate JSON Web Tokens issued by OpenID Connect providers..
What is the correct answer to this question?
The correct answer is: JWT authorizer configured for the OpenID Connect issuer — Option B is correct because a JWT authorizer in API Gateway can validate tokens issued by an external OpenID Connect (OIDC) provider without requiring custom code. The JWT authorizer automatically verifies the token's signature, expiry, and issuer against the OIDC provider's JWKS endpoint, meeting the requirement for standards-based authentication and avoiding custom operational scripts.
What should I do if I get this SAA-C03 question wrong?
Review jWT authorizers validate JSON Web Tokens issued by OpenID Connect providers., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
JWT authorizers validate JSON Web Tokens issued by OpenID Connect providers.
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