Which command is used to view tickets stored in a server's credential cache in Kerberos?

The command used to view tickets stored in a server's credential cache in Kerberos is indeed klist. This command retrieves and displays the currently held Kerberos tickets, showing you details such as the principal name associated with each ticket, the ticket's expiration time, and the realms involved. Understanding how to use klist is essential for managing Kerberos authentication since the presence of valid tickets in the cache is what allows users to access various services securely without needing to re-enter credentials repeatedly.

The other options are associated with different functionalities. For instance, kinit is used to obtain and cache Kerberos ticket-granting tickets, while sendmail is a program used to send emails, and finger provides information about logged-in users on a system. Therefore, klist is the correct command to specifically check the status of tickets in the Kerberos credential cache, which directly pertains to the question at hand.