Q & A on Failure recovery in FDDI Q: This question concerns failure recovery in FDDI. It seems that the distinguishing feature of Fiber Distributed Data Interconnect is its ability to recover from faults. If one node goes down, adjacent nodes are able to quickly loop back onto the redundant, counter-rotating ring to form a single ring. The ring remains operational during the down time of the above-mentioned node. Once the ring has been reduced to a single ring, is it possible for the ring to remain operational if another node goes down? A: If a second failure occurs, adjacent nodes loop back, resulting in two separate rings. Q: --If multiple nodes go down? A: Further failures result in further separation. As a practical matter, many implementations use an FDDI hub to which all computers connect. The hub contains electronics to detect failures and eliminate only those stations that fail; the hub can keep all operational nodes on one logical ring.