Want to create a intranet portal where all users after authencated by windows domain controller should not login again in to SharePoint to access SharePoint intranet portal. What steps should be taken to implement this? Is Active Directory federated service required to implement this?

Hi,

As I understand, you want to implement single-sign on in intranet portal in SharePoint 2013.

You could add the SharePoint site to Intranet Sites in IE and enable Integrated Windows Authentication.

For more detailed information, you could refer to the articles below.

The article below is about how to enable single sign-on to SharePoint.

http://help.unc.edu/help/how-to-enable-single-sign-on-to-sharepoint/

The article below is about more information about SSO experience when authenticating via ADFS.

http://blogs.technet.com/b/abizerh/archive/2013/04/11/more-information-about-sso-experience-when-authenticating-via-adfs.aspx

More references:

The article below is about Claims-Based Single Sign-On for Microsoft SharePoint 2010.

https://msdn.microsoft.com/en-us/library/hh446525.aspx

The article below is about single sign-on from Microsoft Office SharePoint Server to applications.

http://www.ibm.com/developerworks/tivoli/library/t-ssomsos/

Best regards,

Sara Fan