networks

by sarah wood

network

Bus Network



  • Bus networks are connected together.
  • If one of the computers is faulty all the other computers go faulty too.
  • The bus network costs less because they aren't separated.
  • The bus is easy to install.
  • As more workstations are connected the performance of the network will become slower because of data collisions.

In a bus network all the workstations, servers and printers are joined to one cable (the bus). At each end of the cable a terminator is fitted to stop signals reflecting back down the bus.

Ring Network

  • If the main cable fails or any device is faulty then the whole network will fail
  • This type of network can transfer data quickly, even if there are a large number of devices connected because the data only flows in one direction, so there won’t be any data collisions.

In a ring network each device (workstation, server, printer) is connected to two other devices, this forms a ring for the signals to travel around. Each packet of data on the network travels in one direction and each device receives each packet in turn until the destination device receives it

Star network

  • very reliable – if one cable or device fails then all the others will continue to work
  • expensive to install as this type of network uses the most cable (network cable is expensive)
  • high performing as no data collisions can occur

In a star network each device on the network has its own cable that connects to a switch or hub. A hub sends every packet of data to every device, whereas a switch only sends a packet of data to the destination device.