Zones and Namespace

Trying to get a clear answer to this. I have read several threads/links posted here and on MS etc but none are clear to me (in my pea brain anyway).
ex. one.two.three.com:
One is a zone, Two is another zone and Three is another zone? Each (.) represents a zone?
Is one, two and three each considered a namespace?
If each is a zone, does each zone require its own DNS server?

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dynamik

kctxau wrote: »

One is a zone, Two is another zone and Three is another zone? Each (.) represents a zone?

Yea, it starts with the root (.) zone, and the each subsequent level will be its own zone as well. Keep in mind that there are also different types of zones (forward and reverse lookup).

kctxau wrote: »

Is one, two and three each considered a namespace?

No, that refers to the entire hierarchy; i.e. company.com would be your namespace.

kctxau wrote: »

If each is a zone, does each zone require its own DNS server?

No, a single DNS server can host multiple zones.

kctxau

Thanks for th reply!
"No, that refers to the entire hierarchy; i.e. company.com would be your namespace."
So each website is considered a single name space?
ie:
company.com
microsoft.com
techexams.net/forums
symantec.com/business/solutions/enterprise.jsp

dynamik

Yea, it refers to the domain name and all subdomains, but the content of the webserver, i.e. /whatever isn't part of the domain hierarchy.

kctxau

What is the point of two names for the same thing? IE: support.microsoft.com
Why would the term namespace be better used instead of domain name?

dynamik

Think of the namespace as the hierarchy to which the domain name and all the sub-domains (and potential sub-domains) belong. When I hear domain name, I just think of whatever.com, not the entire hierarchy.

Agent6376

three.com is your namespace

two is a child domain of three.com

one is a child domain of two.three.com