Which term describes a unique identifier in Fibre Channel systems?

The term that describes a unique identifier in Fibre Channel systems is the World Wide Name (WWN). WWN is a globally unique identifier used to identify devices connected in a Fibre Channel network. It serves a crucial role in ensuring that each device, such as a host bus adapter or storage device, can be distinguished from others, allowing for communication and management within the storage area network (SAN).

WWNs are similar in concept to MAC addresses used in Ethernet networking. Each WWN is typically assigned during the manufacturing process, ensuring that no two devices will have the same WWN, thereby mitigating conflicts and enhancing reliability in identifying devices across extensive networks.

In contrast, the other options do not serve as widely recognized unique identifiers in Fibre Channel systems. Global Identifier (GID), Device Address (DA), and Network ID (NID) may refer to other concepts within various networking or storage protocols, but they do not specifically correspond to the unique identification function that WWNs perform in Fibre Channel technology.