Your IT department has deployed a network-attached storage (NAS) appliance so that Windows clients can open and save files over the local network. The clients connect to the share using TCP port 445, which allows file and printer sharing without relying on NetBIOS. Which application-layer protocol is the NAS using to provide this service?
Simple Mail Transfer Protocol (SMTP)
Network File System (NFS)
File Transfer Protocol (FTP)
Server Message Block (SMB) / Common Internet File System (CIFS)
Server Message Block (SMB), also called Common Internet File System (CIFS), is Microsoft's file-sharing protocol. Modern implementations run directly over TCP port 445 and are commonly used by NAS devices to provide file and printer shares to Windows systems. NFS uses port 2049, FTP uses ports 20 and 21, and SMTP uses port 25, none of which match the scenario.
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