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 T-SQL Solution:
 
 SELECT  s.Login_Name, s.Host_Name, Auth_Scheme, count(*) as 'Total Sessions'
 FROM sys.dm_exec_connections AS C
 JOIN sys.dm_exec_sessions AS S ON C.session_id = S.session_id
 group by s.host_name, auth_scheme, s.login_name
 order by 1 asc, 2 asc;
 
 
 Authentication Protocols / Schema (default):
 
 NTLM - Used if RDP to a SQL Server and Authenticate locally using Windows Authentication
 
 Kerberos - Used if RDP to a SQL Server box and, using SSMS, Authenticate remotely to another SQL Server box using Windows Authentication
 
 SQL - SQL Login Authentication
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