Alex van den Bogaerdt wrote:
"A zone is simply a portion of a domain"
Huh ?!?!? An ocean is simply part of an H2O molecule... yeah right.
If you don't want graph theory in a KB article... here's my attempt:
~~~cut ~~~
DNS is organized as rooted tree, each node has a label (the root has
an empty label). The nodes directly below the root are known as TLD
(top level domain). For some TLDs the second level is known as SLD
(e.g. .co.uk.). Zones are connected parts of this tree with a unique
adminstration.
A connected part of a rooted tree is a rooted subtree, and the root of
a zone is known as "zone cut". The root of a subtree is one of the
nodes in the global tree below another node (e.g. a TLD is a subtree,
and all TLDs are zones). For all zones excluding TLDs there's a
non-empty label at the node above their "zone cut", and in that sense
zones could be seen as "portion of their parent domain".
~~~ end ~~~
So far it's no nonsense, or is it ? It would be odd to say that some
zone.co.uk is "a portion of the uk zone" (because co.uk is no zone,
or is it ?), it's "a portion of co.uk", and that's a SLD.
What about DOMAIN www.microsoft.com ?
[...]
Do they or do they not belong to ZONE microsoft.com ?
My nslookup apparently refuses to tell me who created the www CNAME.
Is that as it should be for q=ns or q=soa www.microsoft.com ?
Frank
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