[windows2000] Re: PDC Emulator
- From: "Sullivan, Glenn" <GSullivan@xxxxxxxxxxxxxx>
- To: "'windows2000@xxxxxxxxxxxxx'" <windows2000@xxxxxxxxxxxxx>
- Date: Fri, 22 Nov 2002 07:34:06 -0500
The PDC emulator is also a "traffic cop" for certain domain-wide operations
as well.
Remember that while one of the primary benefits of an Active Directory is it
multi-master style of management (i.e., you can make changes to the domain
by changing any DC and the changes get replicated) there are certain things
that do not fit well in the Multi-master environment.
The primary one that comes to mind is password changes. Due to the
criticality of maintaining the integrity of passwords accross multiple DC's,
the PDC emulator receives preferential treatment for password change
replication from other DC's. It then can mediate between multiple changes
received by multiple DC's, and ensure that all of them are in synch at the
end.
Just didn't want you to think you could turn off your PDC Emulator once you
get an all Win2K domain...
Also, to clarify what is said below:
Mixed mode = both Win2K and WinNT4 DOMAIN CONTROLLERS. The clients on the
network do not matter.
Native Mode = All Win2K DOMAIN CONTROLLERS. The clients on the network do
not matter.
But the PDC emulator is where the down-level (pre WinNT) clients
authenticate to, so it is particularly critical in those environments that
(mixed or native) contain down-level clients.
HTH,
Glenn Sullivan, MCSE+I MCDBA
David Clark Company Inc.
-----Original Message-----
From: Chris Berry [mailto:compjma@xxxxxxxxxxx]
Sent: Thursday, November 21, 2002 8:41 PM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: PDC Emulator
>From: "Rod Falanga" <rjfalanga@xxxxxxxxxxxxxx>
>OK, so I'm asking what for most of you is a simple question. In class,
>the instructor has mentioned several times something called a "PDC
>Emulator". I know, from NT domains, that "PDC" stands for "Primary
>Domain Controller". From this class I'm getting the distinct feeling
>that in a Windows 2000 Active Directory network, in native mode, that
>there isn't a primary domain controller.
>So, what is the "PDC Emulator"?
Ok, its not too complicated, basically in windows 2000 there is no PDC and
BDC, only Domain Contollers all of which are equal. Now that said, there
are a few master services such as the globabl catalog server that are
created on the first DC in your domain, but you can move them around, they
aren't tied to one particular machine. In essence however all Domain
Controllers in win2k are equal, however to maintain backwards compatibility
with NT4.0 (which requires a PDC be present) win2k has a PDC emulator that
pretends to be the PDC for NT machines. In this way you can use win2k and
NT4.0 in what is called a "Mixed" environment, some of the features of win2k
are not available except in "Native" mode but you can't use native mode
unless you have no machines except for win2k (and I think XP is also ok)
this includes NT, Linux, Mac, etc. The PDC Emulator will be on the first
machine that you created in the domain, though you can move it to another
one if you need to for some reason. Hope that helps.
Chris Berry
compjma@xxxxxxxxxxx
Systems Administrator
JM Associates
"And here in our server room you can see our Beowolf Cluster of C64's that
keeps our enterprise on the very cutting edge of technology."
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