What does DAS stand for in FDDI networks?

In FDDI (Fiber Distributed Data Interface) networks, DAS stands for Dual Attachment Stations. This term refers to network devices that are connected to the FDDI network in a way that allows them to connect to two different segments of the network simultaneously. This design enhances reliability and fault tolerance within the network because if one segment fails, the station can still communicate over the alternate segment.

Using dual attachments ensures that there is a backup path for data transmission, which is critical in maintaining continuous and reliable network communication. This characteristic is particularly important in enterprise environments where downtime can lead to significant operational disruptions.

Other terminologies presented in the choices do not accurately reflect the terminology used in FDDI networking, focusing instead on differing concepts that do not pertain specifically to the architecture or functionality of FDDI. Thus, Dual Attachment Stations is the correct answer in this context.