NameSpace confusion

[Tony]

Hi.
Im learing about DNS , so my confusion is basicaly about DNS name space. I
undrestand about top level, root . but one thing i am confused about , is
the HOST ..
for ex : AB.XYZ.COM ... in this case AB is the host. but is this a phisical
computer with name AB , or just simply a zone in DNS ?
I read somewhere that i can creat such name space in DNS , all on same
computer pointing perhapse to differnt data ..
So buttom line , im totaly confused , as to how i should treat the host
names.
Any heads up , would greatly appreciated.
Regards

 

[Kevin D. Goodknecht [MVP]]

In

Hi.
Im learing about DNS , so my confusion is basicaly about DNS name
space. I undrestand about top level, root . but one thing i am
confused about , is the HOST ..
for ex : AB.XYZ.COM ... in this case AB is the host. but is this a
phisical computer with name AB , or just simply a zone in DNS ?
I read somewhere that i can creat such name space in DNS , all on same
computer pointing perhapse to differnt data ..
So buttom line , im totaly confused , as to how i should treat the
host names.
Any heads up , would greatly appreciated.
Regards

Host names are created with host records.
Using your example AB could be a host name or it could be a third level
domain name. If AB is a third level domain then the host name is added to
the front of the domain, like "host.AB.XYZ.com"
You can have a third level domain as a sub domain in the "XYZ.com" zone or
you could have a zone named "AB.XYZ.com"

But take for instance if XYZ.com is somewhere else and you want to resolve
just one host "AB" out of the XYZ.com zone without conflicting with any
other host in XYZ.com. Create a zone for the FQDN of the host "AB.XYZ.com",
you would create a zone for just that name, and create one host without a
host name (same as parent folder) and give it the IP that you want
AB.XYZ.com to resolve to. Now AB.XYZ.com will be resolved locally while the
other names in XYZ.com will go out to the correct DNS server.

 

[Jonathan de Boyne Pollard]

T> for ex : AB.XYZ.COM ... in this case AB is the host.

No. "ab.xyz.com." is the host. The "ab" is just a _label_, a component of
the domain name. It does not necessarily have any standing it its own right,
lacking qualification by "xyz.com.".

T> is this a phisical computer with name AB , or just simply a
T> zone in DNS ?

No.