In Kerberos, the Ticket Granting Ticket (TGT) is used for which of the following?

A.
Identification

B.
Authorization

C.
Authentication

D.
Multifactor authentication

Explanation:
An authentication ticket, also known as a ticket-granting ticket (TGT), is a small amount of
encrypted data that is issued by a server in the Kerberos authentication model to begin the
authentication process. When the client receives an authentication ticket, the client sends the
ticket back to the server along with additional information verifying the client’s identity. The server
then issues a service ticket and a session key (which includes a form of password), completing the
authorization process for that session.
In the Kerberos model, all tickets are time-stamped and have limited lifetimes. This minimizes the
danger that hackers will be able to steal or crack the encrypted data and use it to compromise the
system. Ideally, no authentication ticket remains valid for longer than the time an expert hacker
would need to crack the encryption. Authentication tickets are session-specific, further improving
the security of the system by ensuring that no authentication ticket remains valid after a given
session is complete.