Which protocol does iSCSI use to transport SCSI commands over IP networks?

Which protocol does iSCSI use to transport SCSI commands over IP networks?

• A. Fibre Channel
• B. TCP/IP
• C. USB
• D. Thunderbolt

Answer: (B)

iSCSI carries SCSI commands over IP by using a TCP-based transport. SCSI commands are encapsulated into iSCSI messages and then sent as TCP segments across the IP network, giving reliable, in-order delivery essential for storage I/O. The IP layer handles addressing, while TCP provides the guarantees needed for data integrity and sequencing. The default communication over IP typically uses a specific port (3260). Other options refer to different technologies: Fibre Channel is a separate SAN protocol, and USB or Thunderbolt are local interfaces not designed for IP networks.

iSCSI carries SCSI commands over IP by using a TCP-based transport. SCSI commands are encapsulated into iSCSI messages and then sent as TCP segments across the IP network, giving reliable, in-order delivery essential for storage I/O. The IP layer handles addressing, while TCP provides the guarantees needed for data integrity and sequencing. The default communication over IP typically uses a specific port (3260). Other options refer to different technologies: Fibre Channel is a separate SAN protocol, and USB or Thunderbolt are local interfaces not designed for IP networks.