Quick Answer
Amazon Cognito User Pools is the correct choice because it is a fully managed identity provider that handles user registration, sign-in, and issues JSON Web Tokens (JWTs) for authentication, integrating directly with API Gateway to validate tokens via a Lambda authorizer without requiring custom code. This solution is ideal for JWT authentication for API Gateway because Cognito User Pools serve as a secure token issuer, while API Gateway’s built-in JWT authorizer or a custom Lambda authorizer can verify the token’s signature and claims before granting access to backend Lambda functions and DynamoDB. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of managed identity services versus DIY solutions; a common trap is choosing AWS Identity and Access Management (IAM) or a self-hosted OpenID Connect provider, which add unnecessary complexity or lack JWT issuance. Remember the memory tip: “Cognito issues the token, API Gateway checks the note.”
This SAP-C02 practice question tests your understanding of design for new solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company is deploying a serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The company wants to secure the API by requiring authentication via a JSON Web Token (JWT). Which service should the company use to manage user authentication and issue JWTs?
Amazon Cognito User Pools
Cognito User Pools provides authentication and JWT issuance for application users.
AWS Secrets Manager
Why wrong: Secrets Manager stores secrets, not authentication tokens.
AWS Identity and Access Management (IAM)
Why wrong: IAM manages AWS users and roles, not application authentication.
AWS Security Token Service (STS)
Why wrong: STS issues temporary AWS credentials, not JWTs for application users.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon Cognito User Pools
Amazon Cognito User Pools is the correct choice because it is a fully managed identity provider that handles user sign-up, sign-in, and issues JSON Web Tokens (JWTs) for authentication. It integrates directly with API Gateway Lambda authorizers to validate JWTs and control access to API endpoints without custom code.
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.
Amazon Cognito User Pools
Why this is correct
Cognito User Pools provides authentication and JWT issuance for application users.
Related concept
Read the scenario before looking for a memorised answer.
AWS Secrets Manager
Why it's wrong here
Secrets Manager stores secrets, not authentication tokens.
AWS Identity and Access Management (IAM)
Why it's wrong here
IAM manages AWS users and roles, not application authentication.
AWS Security Token Service (STS)
Why it's wrong here
STS issues temporary AWS credentials, not JWTs for application users.
Common exam traps
The trap here is that candidates often confuse AWS STS (which issues temporary AWS credentials) with a service that issues JWTs for application users, leading them to select STS instead of Cognito User Pools.
Detailed technical explanation
Cognito User Pools issue JWTs in two forms: an ID token (containing user claims) and an access token (used to authorize API requests). The API Gateway Lambda authorizer can validate these tokens by checking the issuer (iss), audience (aud), and signature using the JWKS endpoint exposed by the user pool, without needing to call Cognito for every request. In a real-world scenario, you might combine Cognito User Pools with an API Gateway HTTP API and a JWT authorizer for low-latency token validation at the edge.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon Cognito User Pools — Amazon Cognito User Pools is the correct choice because it is a fully managed identity provider that handles user sign-up, sign-in, and issues JSON Web Tokens (JWTs) for authentication. It integrates directly with API Gateway Lambda authorizers to validate JWTs and control access to API endpoints without custom code.
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.
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Last reviewed: Jun 24, 2026
This SAP-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 SAP-C02 exam.
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