Dots in hostnames (or: AD vs. DNS "Domains")

[Stephane Bortzmeyer]

On Sun, Oct 21, 2007 at 01:47:42PM -0700,
 David Carmean <dlc at halibut.com> wrote 
 a message of 43 lines which said:

> The problem (as I see it) is that he has *not* created proper DNS
> subdomains with those names.  There is no DNS delegation from
> ad.example.com to na.ad.example.com; no NS records for
> na.ad.example.com.

It is perfectly OK and he was right. He created subdomains which are
not zones. This is legal and common.