Which layer of security does two-factor authentication provide?

• A. Two-step verification
• B. Single-password security
• C. Password-less functionality
• D. One-time passwords

Answer: (A)

Two-factor authentication provides an additional layer of security known as two-step verification. This security measure requires users to provide two different types of information to verify their identity. Typically, this involves something the user knows, like a password, and something the user has, such as a mobile device that can receive a verification code.

By requiring two forms of identification, two-factor authentication significantly enhances security compared to relying solely on a password. This is particularly important because passwords can be weak, stolen, or easily forgotten, whereas the second factor (such as a code sent to a mobile device) adds an extra barrier that makes unauthorized access much more difficult.

The other options do not accurately describe the layer of security provided by two-factor authentication. Single-password security refers to the traditional method of using a username and password, which lacks the additional security of a second factor. Password-less functionality and one-time passwords pertain to different authentication methods that do not encompass the comprehensive approach of two-step verification inherent in two-factor authentication.