Why Have A Secondary Domain Controller?

What is the purpose of additional domain controller?

Additional AD domain controller is used to balance the load among existing domain controllers.

It also provides fault-tolerance that in case primary AD DC is down, additional AD DC can be used for authentications without any business discontinuity.

Why should there be more than one domain controller in a domain?

2 Answers. The primary reason for having multiple domain controllers is for fault tolerance. They will replicate the Active Directory information between them and can provide services if the other is unavailable. Having multiple DC’s is a best practice standard.

What is the difference between primary domain controller and secondary domain controller?

Frankly, there is no difference between primary or root domain controller or additional domain controller. Both provides the same functionality and the term primary or root domain controller only used to segregate the DC holding the FSMO role.

How do you promote a secondary domain controller?


  • Log on to a BDC as an Administrator.
  • Start Server Manager (Start – Programs – Administrative Tools – Server Manager)
  • If the PDC is not available then a warning will be displayed “Cannot find Primary DC for <domain>”
  • Click on the BDC you want to promote to the PDC.
  • From the Computer menu select “Promote to PDC”

What is Rodc?

A read only domain controller (RODC) is a type of domain controller that has read-only partitions of Active Directory Domain Services (AD DS) database. RODC is available in Windows server 2008 OS and in its succeeding versions.

What is a secondary domain?

secondary domain – Computer Definition

If a country code is also used in the address, it becomes the TLD and the gTLD becomes the secondary domain. See also country code, DNS, domain, gTLD, Internet, and TLD.

Can you have two domain controllers on the same network?

Multiple domains can exist on the same network as long as the domain name and netbios names are different. Agree with this, only make sure one network is all static and outside of the DHCP and correct DNS Servers. All PCS for other company is pointed manually for DNS while the main tenant DC is pointed on DHCP POOL.

Do I really need a domain controller?

Do I Need a Domain Controller? In general, yes. Any business – no matter the size – that saves customer data on their network needs a domain controller to improve security of their network. There could be exceptions: some businesses, for instance, only use cloud based CRM and payment solutions.

How many domain controllers should you have?

2 domain controllers