Which of the following is true about LUN access in SAN environments?

• A. LUNs are accessed using block-based protocols.
• B. LUNs are only accessible via NAS protocols.
• C. LUNs cannot be accessed via SAN.
• D. LUNs are accessed using only file-based protocols.

Answer: (A)

LUNs in a SAN are block-level storage presented to hosts as disks, accessed over block protocols such as Fibre Channel or iSCSI. These protocols carry raw disk I/O and SCSI commands, allowing the host to treat the LUN as a local disk. NAS protocols like NFS or SMB provide file-level access, not block-level LUN access, so they don’t expose LUNs directly. Therefore, the true statement is that LUNs are accessed using block-based protocols. The other options misstate the access method or imply NAS/file-based access, which isn’t how LUNs are presented in SAN environments.