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Can you give some basic idea, where I can start as I need some guidence
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Can you give some basic idea, where I can start as I need some guidence

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You asked some incredibly broad questions, so the book I linked to really is a good place to start.
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You asked some incredibly broad questions, so the book I linked to really is a good place to start.

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What is the recommended size (no. of users) for a site to install local AD server<br />
What is the functions of AD server<br />
What is the pros in having local AD server installed<br />
What is the cons in having local AD server installed<br />
What is the recovery process in event of AD server hard disk crash, etc.<br />
If AD server is down, what is the failover/backup arrangement
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What is the recommended size (no. of users) for a site to install local AD server
What is the functions of AD server
What is the pros in having local AD server installed
What is the cons in having local AD server installed
What is the recovery process in event of AD server hard disk crash, etc.
If AD server is down, what is the failover/backup arrangement

AD Queries

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.