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, which acts as a conduit to transmit messages.It also can reduces the chance of network failure by connecting all of the systems to a central node. When applied to a bus-based network, this central hub rebroadcasts all transmissions received from any peripheral node to all peripheral nodes on the network, sometimes including the originating node. The failure of a transmission line linking any peripheral node to the central node will result in the isolation of that peripheral node from all 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, or concentrator. Data on a star network passes through the hub, switch, or concentrator before continuing to its destination. The hub, switch, or concentrator manages and controls all functions of the network. It is 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 cable or optical fibre cable.
ADVANTAGES.
One of the advantages of a star network is that, a low specification twisted-pair cable can be used for connection between the server and the nodes (clients) since data rate is relatively low between the central server and the nodes. Also, a fault on one of the nodes will not affect the rest of the network, as individual node failure does not affect the network.
DISADVANTAGES.
The basic problem with the star topology is that the network is highly dependent upon the operation of the central server. Hence, there is a single point of failure. how functionally effective the central server is, determines how effective the network is. If the central server is significantly slow, then the network becomes slow, or, if it (server) becomes un-operational, then the complete network would be shut down.
WHAT IS STAR TOPOLOGY.
A topology is a physical structure of a network. Star topology is one the most common topology in the LAN. Other topologies are Ring topology, Bus topology and Mix topology.
In start topology every computer is connected to a central point. That central pointmay be a HUB or a switch. The media used in this topology is twisted pair cable. The communication devices used is a LAN card. Every computer must have a LAN card and a twisted pair cable. One end of the cable is plugged in LAN card and the other is connected with the HUB or a switch. If we have a domain then the Server should also be connected with the HUB or switch. Every source, which we may share, should be connected to one of the computers (e.g. printer).
Star topology is considered one the best topology. The advantage is that if anycomputer is not working or any cable is not working then the whole network will not be affected. But the disadvantage is that it is expensive form of network as every computer required a separate cable to form the network. The other disadvantage is that if the HUB is not working, the whole network will be dumb.
In start topology every computer is connected to a central point. That central pointmay be a HUB or a switch. The media used in this topology is twisted pair cable. The communication devices used is a LAN card. Every computer must have a LAN card and a twisted pair cable. One end of the cable is plugged in LAN card and the other is connected with the HUB or a switch. If we have a domain then the Server should also be connected with the HUB or switch. Every source, which we may share, should be connected to one of the computers (e.g. printer).
Star topology is considered one the best topology. The advantage is that if anycomputer is not working or any cable is not working then the whole network will not be affected. But the disadvantage is that it is expensive form of network as every computer required a separate cable to form the network. The other disadvantage is that if the HUB is not working, the whole network will be dumb.
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