The FQDN or Fully Qualified Domain Name is the joining of the domain and its
host name. When you speak of .local you are referring to the root of a
domain that isn't recognized by external dns. So the question you ask
doesn't correlate.
I assume what you wanted to know why use .local as compared to a .com (For
instance). If you use the .local nobody from the internet is going to get
into your network. You can create a dmz and have non-domain members with
definable dns names that can serve up pages to the web for business
purposes.
So the short answer is more secure and you won't have to worry about
duplicate names.
--
Paul Bergson MCT, MCSE, MCSA, CNE, CNA, CCA
http://www.pbbergs.com
This posting is provided "AS IS" with no warranties, and confers no rights.