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Computer network is a set of communication elements (computer, mobile, routers, printers, switches etc) connected by communication link either wired (optical fiber, coaxial fiber, twisted pair) or wireless (radio, Satellite or microwaves). These computer networks can be arranged by using topologies. We can classify it into two categories namely-

• Physical topology – the actual layout of the computer cables or the physical presence.
• Logical or the signal topology – the way actually he devices communicate internally.

But in general there are six types of topology which include bus, ring, star, mesh, tree and hybrid topology. Nowadays star, bus and mesh topology is widely used. This network is usually in straight line. This needs less cable. The information in this network if passed will be sent to all computers. In this if the cable breaks the entire network will go down. Mesh topology is where each computer is connected to every other Personal Computer. Each computer is connected through dedicated link (direct link) mesh is popular in WAN.

It is used in routers. It is the most secured network but wiring is very complicated. The third topology is the star topology which is most widely used where all devices are connected to a central device hub or switch. Cable failure will affect only single user. Easy to add new device and adding will not create any problem to the network. We can even easily shoot trouble. Next topology is the ring topology where data travels in circular fashion from computer to another over the network. In this in order to communicate one has to wait for token which overcome the problem of collision. Then we have the hybrid topology which is the combination of two or more topology. Finally the tree topology is an extension of the star and bus topology.

• Point to point connection where there is one link between two workstations. For example wire link
• Multiple point connection- in this we have a mainframe computer to which multiple workstations are connected.

In basic terms computer network is data communication over connected physical devices. There are three basic characteristics of data communication. First, delivery ensures that data is transmitted to the authorized person. Secondly, while delivering a message there are certain noises which creates some problem because of which data gets lost. Accuracy is very important as it ensures that data is not lost and reduces the noise factor. And the third characteristic is the timeliness which ensures that the data is transmitted on time without any delay.

There are five basic components of data communication system in computer networking.

1) message- message is nothing but the information or data which is to be sent from sender to the receiver. Data can be represented using text/numbers/images/audio or video.
2) sender- sender is the device such as a host (service provider), video camera, telephone or workstation (PC) etc.
3) medium- it is the path over which message can be travelled from sender to receiver.
4) receiver- the device that receives the message and reproduces it.
5) protocol- protocol is defined as set of rules that are agreed by the sender and the receiver.

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