A server administrator wants to isolate a SAN hosted LUN to be visible to only a single host. Which of the following methodologies would be used to present the LUN to only that host?

LUN masking is configured on the storage array itself, using host identifiers such as World Wide Names (WWN) or iSCSI Qualified Names (IQN) to control exactly which hosts are permitted to see and access a given LUN. By masking the LUN to a single host's identifier, all other initiators on the SAN fabric are prevented from discovering or mounting that LUN, achieving true storage-layer isolation.

LUN ID assignment simply gives a numeric label to a LUN for addressing and reference purposes and provides no access-control mechanism to restrict which hosts can discover or use it.

Port mapping refers to associating logical or physical ports in network or virtualization contexts and does not provide a SAN-level mechanism to restrict LUN visibility to a specific host.

Port zoning controls which initiators and targets can communicate within a Fibre Channel switch fabric, but it operates at the fabric path level rather than masking individual LUN visibility at the storage array.