Great Thank you so much, Now i want to delete this discussion but unable to due to funny replies 🙁

Thank you @SSC Rookie i appriciate your explanation..

And rest of you friends give some information which can make discussion to go on to improve knowledge

Thank you

Thanx.. Is there any production DBA, if possible can you/anyone give me a small description regarding all DBA types ..

Yes i just got known that we can use local user groups too , to check windows authentication. Thank you one and all for all your valuable replies, you all...

i only installed Active Directory users and computers role ( to work with assigning user roles and permission from sql server to windows authentications), and i didnot installed DNS server....

Yes iam running enterprise edition of sql server 2008 r2 but only for my practical purpose, for my selft not for an organizational purpose.

So shall i run sql server 2008...

Yes i read.. i understand that concept,

I want solution shall i install anther windows server on virtual machine and making it as domain controller , and i will install...

Yes i read this article

http://support.microsoft.com/kb/2032911

i only have one Laptop , can i run sql server on a normal windows server ? i can but this makes me to...

Yes.. Installing ADUC nothing but Domain Controller.. kindly lemme know drawbacks and benifits of installing sql server on Domain Controller and a normal Windows Server