I'm not all that familiar with networking or protocols and couldn't find a similar question here or elsewhere. One of my security people is asking whether SQL Server requires NetBIOS for Named Pipes. I found this article that says NetBIOS should be disabled, but it's rather old and not from a source I've heard of.
From this MSDN forum discussion, Tibor says:
Named Pipes uses NetBIOS
And from this MSDN forum discussion, Puzzle_Chen says:
Named pipes use the NetBIOS session layer