Monday, February 22, 2016

exchange - Can someone explain the relationship between a server's FQDN and Active Directory Domain




Sorry, I know this is a rather lazy question, my server experience is limited to OS X, I'm hoping a Windows guy can "explain it to me like I'm five"



I'll need to help configure a bunch of iPads/iPhones to use Exchange shortly, and I'm sure some of the users will give me inaccurate authentication details. Rather than send them packing, I'd like to be able to make an educated guess at what it might be based on the info they do know, but I'm still a bit fuzzy on the following:



• do all versions of Windows Server follow the same rules for the AD Domain (eg: is it based on FQDN? NetBIOS name? totally arbitrary?)?



• is an AD Domain case-sensitive?



Edit: I'm not asking what is the difference between the two (yes, we use DNS on the Mac too). The question is rather what is the relationship between the two. Do they need to match, basically.



Answer



The DNS suffix of a domain joined computer is the name of the Active Directory domain to which the computer is joined, which is also the DNS namespace for the domain.



So, you have a computer named "computer1" in an AD domain named "mydomain.local":



The NetBIOS name for the computer is computer1



The name of the AD domain that the computer is joined to is mydomain.local



The DNS suffix for the computer is mydomain.local




The AD DNS zone for the domain is mydomain.local



The FQDN of the computer is computer1.mydomain.local.



The NetBIOS name for the domain is mydomain (although it is possible to create a NetBIOS name for the domain that doesn't match the DNS name for the domain).



EDIT



Incidentally, in Windows NT 4 it was possible for a computer to have a different DNS host name than the NetBIOS name (multiple DNS host names in fact), but I don't think that's been possible since Windows 2000, due to AD's integration with DNS.



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