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OAuth 2.1 knowledge quiz

Ten-question quiz covering OAuth 2.1's removed grants, PKCE requirements, refresh-token rotation, redirect-URI rules, and security baseline. Explanations on every answer.

1. Which grant type is REMOVED in OAuth 2.1?
2. Which PKCE code_challenge_method is allowed in OAuth 2.1?
3. What must happen to a refresh token when used (OAuth 2.1)?
4. How are redirect_uri values matched in OAuth 2.1?
5. Where must access tokens be passed (OAuth 2.1)?
6. What's the difference between OAuth and OpenID Connect?
7. What is the purpose of the `state` parameter in /authorize?
8. What is `nonce` in OIDC for?
9. For a mobile app, which grant type should you use?
10. Why was ROPC (password grant) removed from OAuth 2.1?

Answer all 10 questions to see your result.

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