Which statement is true about iSCSI in ONTAP?

• A. It is not supported on ONTAP
• B. It is used to present block storage over IP networks
• C. It only works with Windows clients
• D. It uses SMB protocol underneath

Answer: (B)

The concept being tested is how iSCSI provides block storage over an IP network in ONTAP. iSCSI carries SCSI commands over TCP/IP, allowing a storage system to present raw block devices (LUNs) to hosts as if they were direct-attached disks. In ONTAP, you configure an iSCSI target and expose LUNs to initiators, so a host sees a block device it can partition and format just like a local disk. This is why the true statement is that iSCSI is used to present block storage over IP networks.

It's not correct to say iSCSI isn’t supported by ONTAP—ONTAP does support iSCSI targets. It’s also not limited to Windows clients; iSCSI initiators exist for Linux, VMware, and other systems. Finally, iSCSI does not use SMB underneath; SMB is a separate file-sharing protocol used for file storage, whereas iSCSI operates at the block level over IP.