Ramblings from another nerd on the grid
Since many other operating system vendors are also adopting this MIT-developed authentication protocol, Kerberos Version 5 will increasingly become a centerpiece of enterprise-level interoperability. Kerberos provides secure user authentication with an industry standard that permits interoperability. The Active Directory domain controller maintains user account and log-in information to support the Kerberos service.
Want to learn more? Be sure to bookmark the Kerberos Survival Guide on the TechNet WIKI at http://social.technet.microsoft.com/wiki/contents/articles/4209.kerberos-survival-guide.aspx.