To answer your question, you're going to have to inventory all of the servers and services in use at your site, and then research each one to see if they support LDAP or kerberos login. If they all support kerberos, then shoot for that.
To clarify that: Kerberos may be your ideal authentication mechanism, but it probably won't give you all of the features you need. Usually you implement kerberos in conjunction with LDAP.
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