STAR TOPOLOGY (DEFINITION)
Star networks are one of the most common computer network topologies.
In its simplest form, a star network consists of one central switch, hub or computer, whichacts as a conduit to transmit messages. This consists of a central node, to which all other nodes are connected; this central node provides a common connection point for all nodes through a hub.
Thestar topology reduces the chance of network failure by connecting all of the systems to a central node.
COMPARISON WITH BUS NETWORK
When applied to a bus-based network, this central hubrebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, sometimes including the originating node. All peripheral nodes may thus communicate with all others bytransmitting to, and receiving from, the central node only. The failure of a transmission line linking any peripheral node to the central node will result in the isolation of that peripheral node fromall others, but the rest of the systems will be unaffected.
It is also designed with each node (file servers, workstations, and peripherals) connected directly to a central network hub, switch, orconcentrator.
WORK OF THE HUB, SWITCH, OR CONCENTRATOR
Data on a star network passes through the hub, switch, or concentrator before continuing to its destination. The hub, switch, or concentratormanages and controls all functions of the network. It also acts as a repeater for the data flow. This configuration is common with twisted pair cable. However, it can also be used with coaxial cableor optical fiber cable.
* Better performance: star topology prevents the passing of data packets through an excessive number of nodes. At most, 3 devices and 2 links are involved inany communication between any two devices. Although this topology places a huge overhead on the central hub, with adequate capacity, the hub can handle very high utilization by one device without...
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