IT Interview Questions: What's FDDI Fiber Distributed Data Interface (FDDI)

Information Technology (IT) Interview Questions and Answers

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IT Interview Questions: What's FDDI Fiber Distributed Data Interface (FDDI)

Fiber Distributed Data Interface (FDDI) is a LAN technology that uses fiber optic cable. FDDI is a ring topology that uses four-bit symbols rather than eight-bit octets in its frames. The 48-bit MAC addresses have 12 four-bit symbols for FDDI. FDDI is very fast and provides a data transfer rate of 100 Mbps and uses a token-passing mechanism to prevent collisions. FDDI uses two rings with their tokens moving in opposite directions to provide redundancy to the network. Usually only one ring is active at a given time. If one ring breaks, the other ring is used and the network does not experience downtime. FDDI interfaces on a non-modular Cisco router are F0, F1, F2 and so on. ?F? stands for FDDI and the number following ?F? signifies the port number. In a modular router, a slot number/port number will follow ?F?.

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