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 10 - How To Add The Second Windows Server 2008 R2 Domain Controller To A Domain

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Tutorial Overview
Domain controller as server for hosting your company Active Directory (AD) is very important part of your network infrastructure. In case of its failure logging users on AD is impossible. Because of that one of the main things in planning your network infrastructure is make plan for implementing redundant domain controller in network infrastructure. In case you have it, failure of one of them does not mean that user will be unable to log on the system. Since failed domain controller is up again, backup controller will be in function of users authentication or other functions which it can have (DNS server etc.). On this way your network can stay functional, reliable and more resistible to failures.

You have to add a domain controller to your network when you decide that it is cost-effective for your organization to have the unified system of credentials, users, groups, and permissions that an Active Directory domain provides, in addition to the machine and user policies provided by Group Policy. Some of the benefits are that you can control a number of machine and user settings centrally, and users can log onto any machine in the network with one username and password. The main detriment is the cost: You need a machine to act as the domain controller (which can be shared with other server roles in a small organization), the Microsoft server software license, client access licenses for all machines joined to the domain, and personnel to administer the domain (maybe not another employee for a single server, but it's going to take time out of someone's day, whether they are internal or a consultant).