I was asked this question in an interview, and I have no idea what the answer is.

I know we have Windows authentication mode and SQL Server authentication. But the interviewer said that we have two protocols that Windows verify when using Windows authentication.

I just can't find anything on the Internet about this.


1 Answer 1


They were probably looking for an answer that discuss the "Kerberos" and "NTLM" Windows authentication protocol/schemes.

Once you know what to search for, there are lots of articles online about how these schemes relate to SQL Server:


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