I saw that I can make PC_A an e.g. Windows Server 2008 a domain controller simply by running
dcpromo After that, I can create a user e.g. George, which is a user in the domain of controller e.g DOMAIN_ABC.
Now I go to another PC_B and if I change the DNS server (in the properties) to "see" the domain controller I created, then in that PC I can log in as DOMAIN_ABC/George although there was no account George created in that PC.
But I can not understand how this works.
I mean when I set as the DNS server machine of PC_B to be PC_A then PC_A is also the domain controller, I mean not only acting relating to Name <-> IP mapping? And then when I open PC_B and type DOMAIN_ABC/George and password and press login, what happens?
PC_B contacts PC_A and sees it is a user and accepts login although there is no account in PC_B?
Could someone please explain the concept of domains in Windows Machines?