CompTIA Cloud+ Practice Test

What technique enhances security by requiring two forms of identification from the user?

1. Encryption

2. Two-factor authentication

3. Access control lists

4. Single sign-on

The correct answer is: Two-factor authentication

Two-factor authentication enhances security by requiring two distinct forms of identification from the user before granting access to a system or service. This technique typically combines something the user knows (like a password) with something the user has (such as a mobile phone to receive a one-time code) or something the user is (like a fingerprint or facial recognition). By implementing two forms of identification, the likelihood of unauthorized access significantly decreases, as it is less probable for an attacker to possess both factors. The concept of two-factor authentication is critical in protecting sensitive information and systems since it adds an additional layer of security that goes beyond just using a password. This method is particularly useful in environments where data security is paramount, such as in cloud services and online banking. In contrast, other concepts such as encryption focus on the protection of data at rest or in transit rather than on user authentication methods. Access control lists manage permissions and rights to resources and do not specifically address the verification of user identity. Single sign-on allows users to access multiple applications with one set of credentials, simplifying user experience but not necessarily enhancing security by requiring multiple forms of identification.