Remember this?

[Kevin Darcy]

Mark.Andrews at nominum.com wrote:

> >
> > >>nyc not delegated
> > >>because it and booksellers.com served out of same authoritative server.
> >
> >
> > >I don't understand that last sentence. Why should the presence or absence of
> > >a delegation be in any way dependent on whether or not the parent and child
> > >zone are "served out of same authoritative server"? To put it another way:
> > >what do you think will break if you add the delegation?
> >
> >
> > Cricket said you can't delegate away what you claim to be authoritative for.
> > I'm a little confused, did you mean for me to delegate nyc to myself?
>
>         If the parent delegates to you, you cannot delegate the *same* zone
>         to someone else.
>
>         You can always delegate subzones (nyc.booksellers.com is a subzone
>         of booksellers.com) to a different (or same) set of nameservers
>         as those for the parent zone.  The usual reason for doing this is
>         to move administative responsability.  The other reason is to be
>         consistant you have to delegate some sub zones for administative
>         reasons and you do the others to be consistant even though you
>         are still adminstering them.

There are other possible reasons as well:

1. To break up large zones in order to minimize zone-transfer latency/overhead.

2. To separate dynamically-maintained from statically-maintained data, or data
with different access/update privileges.


- Kevin