Next to the LDAP Web Service Settings is “LDAP Attribute definitions”. This UI allows the administrator to define the LDAP attributes, which will be used by the LdapProvider Plugin and the LDAP Claims transformation.

Let us also have a look at the form for adding and editing LDAP attribute:

LDAP Attribute Name: Specifies the LDAP-Display-Name.

Display Name: Specifies the CN.

You can find a list of the applicable attributes for Microsoft Active Directory here: http://msdn.microsoft.com/en-us/library/windows/desktop/ms675090%28v=vs.85%29.aspx