A Domain Controller is an important part of a computer network, in fact, it controls its operation. Its main task is to start an important Active Directory service. It works with the Kerberos Key Distribution Centre. It also provides operation on Unix compatible systems. A set of Samba software acts in them as a controller. The domain controller serves to create a local network in which users could be authorized under their own name and with their accounting data. They must do this on all computers. Also, the installation of a domain controller provides the definition of the right of access in the network and management of its security. With its help, you can centrally manage the entire network, which is very important.