Network topologies :-
In computer network, there are number of ways to join computer to speed up the performance and faults tolerance, which are called as network topologies. In short we can say the physical arrangements of computer system is called topology
There are following types of topilogies.
* Bus topology
* Star topology
* Ring topology
* Mesh topology
* Tree topology
* Hybrid topology
In computer network, there are number of ways to join computer to speed up the performance and faults tolerance, which are called as network topologies. In short we can say the physical arrangements of computer system is called topology
There are following types of topilogies.
* Bus topology
* Star topology
* Ring topology
* Mesh topology
* Tree topology
* Hybrid topology
Bus topology :-
In bus topology all the computer are connecting with the central wire called bus. This bus is used to share medium. Coaxial cable and BNC (british naval connector) is used in this topology.
Advantages.
* it is easy to understand.
*adding and removing computer are very simple and easy.
* there is no effect on network if one computer are damange.
*best topology for small network.
Disadvantage.
*security issues
*if there is any error in the network, it can not easily be detect.
*if central wire are damange the whole network stop working
2. Star topology :-
In this topology, all the computer are connected with the central device called hub/switch. All the computer systems communicate with one another with this central device. Twisted pair cable and rj-45 connector is used in this topology.
Advantages
*adding and removing computer very easy.
* simple and easy to understand and managed.
*the central device control the flow of data.
*there is no chance of data collision.
*faluts can easily detect.
Disadvantage
If the central device is shut down whole network will suffer.
*more expensive to bus topology.
4. Ring topology :-
In ring topology every device has exactly two neighbors. All the computers are connected with one another and the last computer are connect with the first computer. All messages travel through a ring in the same direction. Token are passing scheme is used in this topology. Only one token available on the network. When a node a node want to transmit data it will capture the token and tranmit data. Twisted pair cable and RJ-45 connector is used in this topology.
Advantage
* no data collision.
*more effective and less costly.
*best for small network.
If the central computer fails, any other computer can be made central computer.
Disadvantage
*difficult to troubleshoot.
*if one computer become defective, it effect the whole network.
3. Tree topology
Tree topology defines as, the combination of bus and star topology is known as tree topology. In tree topology, its has boths Charactistics bus and star topology. Its allow users to have many servers on the network. Tree topology follows a hierarchical pattern whereby each level is connected to the next higher level in a symmetrical pattern.
Advantages
* highly flexible
*easy to add and remove computer
* supports many hardware and software venders.
* all computer have better access to network.
* reduce network traffic
Disadvantage.
*difficult to configure.
*if hub stop working the entires system connecting to this network stop working.
* too expensive
* diffuct to manage and troubleshoot.
5. Mesh topology.
IN mesh topology, all the network nodes are connected to all other nodes. In short all the computer are connected with each other.. Message sent on a mesh network, can take any possible path from source to destination.
Advantages
* it is most reliable network topology.
* alternative paths are available in case a path is broken.
* most secure network.
*communication fast.
Disadvantages
* difficult to implement as compare to other topologies.
* difficult to add new computer.
* most expensive
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