Authentication Tokens Overview Answers 1. What is the primary purpose of an authentication token? A. To store user passwords B. To encrypt user data C. To create user accounts D. To grant access to resources Answer: To grant access to resources (D) Authentication tokens serve as proof of identity and authorization, allowing access to resources. 2. Which method is commonly used for token generation? A. Data serialization B. Web scraping C. Cryptographic hashing D. File compression Answer: Cryptographic hashing (C) Cryptographic hashing is a well-known method for generating secure tokens based on user credentials. 3. What happens when a token expires? A. It can be reused indefinitely B. It retains its validity until user logs out C. It automatically converts to a new token D. It becomes invalid and must be regenerated Answer: It becomes invalid and must be regenerated (D) Token expiration is crucial to security, and expired tokens are rendered invalid. 4. During token validation, which aspect is primarily checked? A. The token's creation date B. The user's password C. Token’s expiration status D. The user’s permission levels Answer: Token’s expiration status (C) Token validation verifies that the token has not expired, among other checks. 5. Which part of a JSON Web Token (JWT) encodes claims? A. Payload B. Signature C. Encoded Structure D. Header Answer: Payload (A) The Payload section of a JWT contains the encoded claims, including user ID and roles. 6. What is a key feature of OAuth 2.0? A. Direct password sharing with third parties B. Complexity in managing user accounts C. Instant account termination D. Authorization without exposing user credentials Answer: Authorization without exposing user credentials (D) OAuth 2.0 allows secure authorization without sharing user credentials, enhancing security. 7. Token generation and token validation serve which distinct functions? A. Both focus on enhancing password security B. Validation creates tokens; generation checks their validity C. Generation creates tokens; validation ensures their legitimacy D. Both are involved in user registration processes Answer: Generation creates tokens; validation ensures their legitimacy (C) Token generation creates authentication tokens, while validation verifies their authenticity and validity. 8. Which grant type in OAuth 2.0 is considered the most secure for applications? A. Client credentials grant B. Authorization code grant C. Implicit grant D. Resource owner password credentials grant Answer: Authorization code grant (B) The Authorization code grant is typically seen as the most secure method for obtaining access tokens.