CompTIA Security+ Question F-81

A company wants to ensure that all credentials for various systems are saved within a central database so that users only have to login once for access to all systems. Which of the following would accomplish this?

A. Multi-factor authentication
B. Smart card access
C. Same Sign-On
D. Single Sign-On

Answer: D

Single sign-on means that once a user (or other subject) is authenticated into a realm, re-authentication is not required for access to resources on any realm entity. Single sign-on is able to internally translate and store credentials for the various mechanisms, from the credential used for original authentication.