networks

ring,star and bus network

The ring network: In the ring network each device is connected to two different devices and forms a ring for the signals to travel around(in a ring shape)and travels in one direction. The advantages of a ring network is that it can transfer data very fast no matter how many devices are connected. The disadvantages of a ring network is that if the main cable or any cable fails the whole network will fail.


The bus network:

The bus is the data link in a bus network. The bus can only transmit data in one direction, and if any network segment is severed, all network transmission ceases.

A host on a bus network is called a station or workstation. In a bus network, every station receives all network traffic, and the traffic generated by each station has equal transmission priority.[1] Each network segment is, therefore, a collision domain. In order for nodes to transmit on the same cable simultaneously, they use a media access control technology such as carrier sense multiple access (CSMA) or a bus master. Advantages:

  • Easy to connect a computer or peripheral to a linear bus
  • Requires less cable length than a star topology
  • It works well for small networks.
  • Disadvantages:

  • Entire network shuts down if there is a break in the main cable
  • Terminators are required at both ends of the backbone cable
  • Difficult to identify the problem if the entire network shuts down
  • Not meant to be used as a stand-alone solution in a large building
  • It is slow when more devices are added into the network
  • If a main cable is damaged then network will fail or be split into two networks
  • The star network: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. 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. In star topology, every node (computer workstation or any other peripheral) is connected to a central node called a hub or switch. The switch is the server and the peripherals are the clients.[1] Thus, the hub and leaf nodes, and the transmission lines between them, form a graph with the topology of a star. If the central node is passive, the originating node must be able to tolerate the reception of an echo of its own transmission, delayed by the two-way transmission time (i.e. to and from the central node) plus any delay generated in the central node. An active star network has an active central node that usually has the means to prevent echo-related problems