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Naming domain example.com vs ad.example.com

I am building a new domain from scratch. We own our pulic domain anme example.com. and have publicly hosted website by a third party hosting provider at example.com .  I am being told the new domain name should be ad.example.com or corp.example.com ( subdomain) . My concern is that I don't want users to use subdomain.example.com\username for logging in . There is a point in AD setup that asks for netbios domain name and it does not allow me to use "example" and says is already being used, but it does allow me to use the subdomain name (ie ad. or corp).  I just don't want to instruct users to use subdomain\username to log in to domain.
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Will Szymkowski
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Typically you would keep the same Netbios name as the FQDN but you do not have to (this is not a best practice though). It is better to keep them the same, if you can.

However, do you have another machine on that network where the machine name is Example?

Setting up a new DC, i have never seen that error message.

Personally i would still not use the same internal FQDN as the external.

Will.
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I think , I found out what is going on. We have an inix ldap server which is doing the job of Active directory and the domain name there is Example.com .Let's say somehow we figure all this out. Can the netbios name be same as domain when using  sub domain i.e ad.example.com ?
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my main concern is where the netbios name come into play  which I guess is at logon. ( or logon to in xP). We also have some mac computers, but I believe they show the domain name at log on if you join to domain.
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Thank you all.