Linux · Samba File Sharing

Why is 'force group = sales' without a leading plus sign a serious security hole compared with 'force group = +sales'?

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You want Windows, macOS, and Linux machines to read and write the same directories over a home LAN. Which protocol does Samba implement to make that work?
In its original form SMB rode on top of NetBIOS. What three services did NetBIOS provide, and how do they map to familiar TCP/IP concepts?
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In Samba terminology, what exactly is a share?
Under user-level security, what does Samba have to maintain that share-level password schemes do not?