Network Topologies

Network Topologies

1. Star topology

   • All devices are connected to the centre ( a central switch or server which controls the network)
   • The central switch allows many devices to access the server simultaneously
   • Pros
     • If a device fails or a cable is disconnected then the rest of the network is unaffected
     • It is simple to add more devices to the network
     • There is better performance than other setupis
       • Data goes to the central device so all devices can transmit data at once
       • There are fewer collisions
     • Consistent performance even when the network is heavily used
   • Cons
     • In a wired network, every device needs a cable to connect to the central switch or server
       • Can be expensive especially if there are lots of terminals
     • If there is a problem with the switch then the whole network is affected
   • Workstations are known as terminals

2. Mesh topology

   • Decentralised meaning that networking devices are either directly or indirectly connected to every other one without the need for one central switch or server
   • No single point where the network can fail. If one device faiils then data is sent along a different route to get to its target.
   • Very expensive as lots of wiring is needed to connect lots of devices together
   • Can be wireless
   • Full mesh topologies are were every device is connected to every other device. In a partial mesh topology, not all devices are fully connected.
   • Can be used to connect entire cities
   • Every node is connected to every other node. Each node sends its own signals and in addition relays data from other nodes.
   • Partial mesh topologies are less costly and reduce redundancy.
   • Data can be transmitted from several devices simultaneously. The network can cope with high traffic.
   • Faster than star network as there is no central switch.
   • May be difficult to expand the network.

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