Which of the following technologies enables port sharing on a single physical port?

WWPN (World Wide Port Name) is a unique identifier assigned to a Fibre Channel port, not a technology that enables port sharing.

N_Port ID Virtualization (NPIV) is a Fibre Channel industry standard that allows multiple logical N_Port IDs to share a single physical N_Port on a Fibre Channel Host Bus Adapter (HBA), effectively enabling port sharing. Each virtual N_Port ID can then be assigned to a virtual machine or application, providing them with their own unique WWPN.

WWNN (World Wide Node Name) is a unique identifier assigned to an entire Fibre Channel node or device, not a technology for port sharing.

Port mapping is a general networking concept often used in NAT or firewall rules, but it does not specifically refer to sharing a physical HBA port in the context of Fibre Channel.