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Is it essential if there's only one domain with DC at different sites?
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Is it essential if there's only one domain with DC at different sites?

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In a single domain the GC doesn't do anything as there are only objects in that domain. --- is that mean there's only one GC is OK for a single domain with DC at different sites?
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In a single domain the GC doesn't do anything as there are only objects in that domain. --- is that mean there's only one GC is OK for a single domain with DC at different sites?

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You really only need one, and have back up or failover
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You really only need one, and have back up or failover

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MS best practice is in single domain single forest make every DC a GC as well. This has been since the beginning.
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MS best practice is in single domain single forest make every DC a GC as well. This has been since the beginning.

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indeed, my recommendation is also to make every dc as GC as it will not add any overhead rather help smoothen authentication process.<br />
I have also seen many applications depending on ldap authentication looks for a nearest GC, in such scenarios, it will always help you.
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indeed, my recommendation is also to make every dc as GC as it will not add any overhead rather help smoothen authentication process.
I have also seen many applications depending on ldap authentication looks for a nearest GC, in such scenarios, it will always help you.

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what function of gobal catalog in DC? how many gobal catalog should I have at different sites?
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what function of gobal catalog in DC? how many gobal catalog should I have at different sites?

gobal catalog server

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).