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- [Instructor] Server Message Block

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is an application layer protocol

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for sharing files, printers, and serial ports.

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It can run directly on TCP port 445,

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which is how it's most often used.

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It can also run on Legacy NetBIOS,

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but is seldom seen doing so.

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It's the best known as the mechanism

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behind Windows file sharing.

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SMB 2.0 was released in 2006 with Windows Vista.

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The supposed chattiness of the protocol was reduced.

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They took the volume of commands from over 100 to just 19.

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Multiple commands can be submitted in a single request

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further increasing efficiencies.

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The block size was also increased from 16 bit to 128 bit

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in some cases which improves performance

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in large file transfers.

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SMB 2.1 was introduced with Windows 7 and Server 2008 RC2.

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This brought some performance enhancements.

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SMB 3 shipped with Windows 8 and Windows Server 2012.

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This too saw additional performance boosts

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as well as some new functionality.

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Additional security enhancements were seen,

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including end-to-end encryption,

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was also introduced using AES Signing.

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SMB 3.1.1 was introduced with Windows 10

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and Windows Server 2016.

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Additional encryption support was added

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and it also implements a pre-authentication integrity check.

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If it determines that a client is SMB 2 or greater,

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it makes secure negotiations mandatory.

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There's also an open source implementation known as Samba.

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This allows Linux devices to act

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as both SMB clients and servers,

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and in some instances,

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they can even operate as a Windows domain controller.

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Virtually every network or system admin

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will use or facilitate the use of SMB sharing

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as sharing is one of the main advantages of any network.