Token Ring
token ring uses a physical star and a logical ring ,while FDDI uses a physical star/ring and a logical ring.
Computers are allowed to transmit data only when they possess a token.Electronic tokens are passed sequentially to each other.
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Star topology:- In this topology all PC are connected with the central device. Central may be HUB and SWITCH. Star widely use in all over word. Ring topology:- In this ring topology all PC are connected in the frame of ring are close Ring topology use MSAU each PC has a two never road one is called up Stream and called down stream. It used token passing Matterhorn which implement the token ring network. " Is the best of star topology".
A star topology is a type of mathematical topology. Mathematical topology is essentially geometry without concern for distance. It asks questions such as for a given shape, (in the abstract sense) "what connects to what," "is it possible to reach point x from point y without passing through point z," and "are these two points connected at all?" A star topology is a type of topology where all the points (for example, computers in a computer network) are connected to a central point, but not directly to each other. Go to the following address to see several types of network topologies, including a star topology. http://scilnet.fortlewis.edu/tech/Network/Topologies.htm
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Basically, in a Bus topology, any station connected to the network can speak at any time. In a ring topology, the stations must wait to be issued the "token" before they can speak. Ethernet (Bus topology) uses CSMA/CD (Carrier-Sense Multiple Access/Collision Detection) to determine when two or more stations speak at the same time. In Ring topologies such as Token Ring and FDDI, this isn't an issue since the passing of the "token" guarantees that no two stations will speak at the same time.
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See related link for Network TopologiesTopology refers to the shape of a network , or the network's layout. How different nodes in a network are connected to each other and how they communicate are determined by the network's topology. Topologies are either physical or logical. Below are diagrams of the five most common network topologies.Mesh TopologyDevices are connected with many redundant interconnections between network nodes. In a true mesh topology every node has a connection to every other node in the network.Star TopologyAll devices are connected to a central hub. Nodes communicate across the network by passing data through the hub.Bus TopologyAll devices are connected to a central cable, called the bus or backbone.Ring TopologyAll devices are connected to one another in the shape of a closed loop, so that each device is connected directly to two other devices, one on either side of it.Tree TopologyA hybrid topology. Groups of star-configured networks are connected to a linear bus backbone.AlternativeDEF: A network (configuration) depiction made as an example by a techie.Omit the word concept together with the word techie for better understanding.
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