Do
not use Single-Label domain names
As a
general rule, Microsoft recommends
that you register DNS domain names
for internal and external namespaces
with Internet authorities. This
includes the DNS names of Active
Directory domains, unless such names
are sub-domains of names that are
registered by your organization
name, for example,
"corp.example.com" is a sub-domain
of "example.com". When you register
DNS names with Internet authorities,
it prevents possible name collisions
should registration for the same DNS
domain be requested by another
organization, or if your
organization merges, acquires or is
acquired by another organization
that uses the same DNS names.
DNS
names that don't include a period
("dot", ".") are said to be
single-label (for example, com, net,
org, bank, companyname) and cannot
be registered on the Internet with
most Internet authorities.
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