A user has entered a user name and password at the beginning of the session, and accesses multiple applications. He does not need to re-authenticate for accessing each application. Which of the following authentication processes is he using?

A.
File authentication

B.
Mutual authentication

C.
Biometric authentication

D.
SSO authentication

Explanation:
The user is using single sign-on (SSO) authentication process. In this process, he needs one-time authentication to access multiple resources. He is required to enter a user name and password

only at the beginning of the session. He does not need to re-authenticate or maintain separate usernames and passwords for accessing each application.

Answer option B is incorrect. Mutual authentication is a process in which a client process and server are required to prove their identities to each other before performing any application function. The client and server identities can be verified through a trusted third party and use shared secrets as in the case of Kerberos v5. The MS-CHAP v2 and EAP-TLS authentication methods support mutual authentication.

Answer option A is incorrect. There is no such authentication process as File authentication. Answer option C is incorrect. Biometrics is a method of authentication that uses physical characteristics, such as fingerprints, scars, retinal patterns, and other forms of biophysical qualities to identify a user. Nowadays, the usage of biometric devices such as hand scanners and retinal scanners is becoming more common in the business environment.