iSCSI is a transport layer protocol that uses TCP/IP to transport SCSI packets, enabling the use of Ethernet-based networking infrastructure as a storage area network (SAN). Like Fibre Channel and other storage transport protocols, iSCSI transports block level data between an initiator on a server and a target on a storage device. IBM developed iSCSI as a proof of concept in 1998 and was ratified as a transport protocol by the Internet Engineering Task Force (IETF) in 2003. The current iSCSI standard is IETF RFC 7143 and can be found at https://tools.ietf.org/html/rfc7143.