What is multi-factor authentication (MFA)?

• A. A security mechanism that requires one verification method to gain access to a resource
• B. A security mechanism that requires two or more verification methods to gain access to a resource
• C. A method that uses biometric data for user verification
• D. A method that only relies on passwords for access

Answer: (B)

Multi-factor authentication (MFA) is defined as a security mechanism that requires two or more verification methods to gain access to a resource. This approach enhances security by combining different types of authentication factors, which typically fall into three categories: something you know (like a password), something you have (such as a smartphone or hardware token), and something you are (biometric data like fingerprints or facial recognition).

The use of multiple factors significantly reduces the risk of unauthorized access, as it is much harder for an attacker to possess all the necessary credentials or items for verification. This layered approach protects against various threats, including phishing attacks, credential theft, and other forms of unauthorized access.

In contrast, options that suggest a single verification method, like using only a password or biometric data alone, do not meet the definition of MFA, as they do not incorporate the additional layers of security that MFA provides.