| A | B |
|---|
| FDDI is a type of | Token Ring network |
| . FDDI is often used for Metropolitan Area Networks (MANs) or larger | LANs, such as those connecting several buildings in an office complex or campus. |
| FDDI runs on fiber-optic cable, and thus combines | high-speed performance with the advantages of the token-passing ring topology |
| FDDI runs at | 100 Mbps |
| FDDI's topology is a | dual ring |
| In FDDI the outer ring is called the | primary ring |
| In FDDI the inner ring is called the | secondary ring |
| In FDDI normally, traffic flows only | on the primary ring. |
| If the primary ring fails, then the data automatically | flows onto the secondary ring in the opposite direction. |
| a wrapped state | when data must flow on the secondary ring because the primary ring failed |
| FDDI Class A | Computers connected to the cables of both rings |
| FDDI Class B | Computers connected to only one ring. |
| A FDDI dual ring supports a maximum of | 500 nodes per ring. |
| The total distance of each length of the cable ring is | 100 kilometers, or 62 miles |
| why FDDI is not considered to be a WAN link | FDDI requires a repeater is needed every 2 kilometers |
| repeater | device that regenerates signals |
| FDDI technology with copper cabling | Copper Distributed Data Interface (CDDI) |
| Advantages of FDDI #1 | dual ring topology provides redundancy and fault tolerance |
| Advantages of FDDI #2 | fiber-optic cable is not susceptible to EMI and noise, and it is more secure than copper wiring |
| Advantages of FDDI #3 | can send data for greater distances between repeaters |
| Disadvantages of FDDI | expensive to implement; need for repeaters make it unsuitable for true WAN communications. |
