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Server Message Block (SMB) is an application-layer network protocol that facilitates network communication while providing shared access to client files, printers and serial ports.
SMB is prevalent in Microsoft Windows operating systems released prior to the Active Directory protocol, where it was known as Microsoft Windows Network.
SMB is also known as the Common Internet File System (CIFS).
SMB was engineered to run via the following application programming interfaces (API) for the network basic input/output system (NetBIOS) and the NetBIOS extended user interface (NetBEUI):
SMB features include: