User Authentication

Dear all respected members, i am an IT professional Network Administrator working in Govt sector. Having strong networking knowledge on windows domain having CCNA, MCSE, MCITP. recently i have moved to linux world and i am new to this world and i need your help.

Dear all as in the Microsoft domain in the client server environment we have an Active Directory server which holds the data of all the users on the domain which server on linux is capable of doing the same.

Thanks in advance

waiting for early reply.