Port 548 TCP
AFP or Apple Filing Protocol works over TCP 548 and is an Apple proprietary networking protocol used for file services via a networked connection.
AFP is short for Apple Filing Protocol, this is an Apple proprietary networking protocol that offered file based services for macOS. The protocol is one of many that Apple support and it's functionality can be compared to some of the others such as FTP.
It provides support for Unicode based files names, access control lists to enforce user security and permissions, extended attributes on the files and directories serviced by AFP, and file locking to ensure that only one user may edit a file at once.
AppleTalk is used by the protocol to perform the service discovery, all the file functionality is within this protocol.
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