What Authentication Protocols does Linux Use?

Hey all,

I was just wondering, as Microsoft Windows does use authentication protocols like NTLM and Kerberos.

What authentication protocols does Linux use? I know that may depend (or not) on the distro, but I am not really sure.

What I do know is that Linux uses PAM to “plug” or “unplug” authentication modules. What I have only done in the past is to configure this file for OpenLDAP.

Thank you in advance!