Which statement best describes the access to LUNs in iSCSI or FCP SAN implementations?

Which statement best describes the access to LUNs in iSCSI or FCP SAN implementations?

• A. LUNs are accessed using block protocols such as iSCSI or FCP.
• B. LUNs are accessed as files over CIFS.
• C. LUNs are accessed as virtual disks via NFS.
• D. LUNs are accessed using HTTP-based APIs.

Answer: (A)

LUNs are block devices, so they are accessed using block protocols. Think of a LUN as a raw disk that a host formats with its own filesystem. iSCSI and Fibre Channel (FCP) transport SCSI commands to that disk, presenting it to the host as a block device. File-based protocols like CIFS (SMB) or NFS operate at a higher, file level and expose files and directories, not raw disks, so they don’t provide direct access to a LUN. HTTP-based APIs are used for management and configuration, not for presenting a LUN to a host. Therefore, the correct description is that LUNs are accessed using block protocols such as iSCSI or FCP.

LUNs are block devices, so they are accessed using block protocols. Think of a LUN as a raw disk that a host formats with its own filesystem. iSCSI and Fibre Channel (FCP) transport SCSI commands to that disk, presenting it to the host as a block device. File-based protocols like CIFS (SMB) or NFS operate at a higher, file level and expose files and directories, not raw disks, so they don’t provide direct access to a LUN. HTTP-based APIs are used for management and configuration, not for presenting a LUN to a host. Therefore, the correct description is that LUNs are accessed using block protocols such as iSCSI or FCP.