Which storage networking technology allows Network Attached Storage to be connected directly to a TCP/IP based network?

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iSCSI carries SCSI commands over TCP/IP networks. By encapsulating SCSI blocks into IP packets and using TCP for reliable delivery, it lets storage devices be accessed directly over an Ethernet-based, TCP/IP network. This enables block storage to be presented over an IP network, forming an IP-based SAN that can connect to a NAS or other servers. Fibre Channel uses its own non-IP transport, SCSI is the traditional command set without IP transport, and SATA is a local, non-network interface. So the ability to connect storage over a TCP/IP network comes from iSCSI.