Computer Networks

 

Computer network is a term used to describe the connection made between computers. This network makes exchanging, sharing and transferring information with other computers possible. There are two types of computer networks, one is peer-to-peer networking and the other is client/server networking.

Peer-to-peer networking is the network made between computers that are held together using a hub (central switch). Computers can share devices like printers and scanners but the only thing that would act as a drawback is that if Computer A is connected to a printer and Computer B wants to print something, computer A should be on. This would waste some of the energy and is likely in-efficient networking technique.

While Client/Server networking is a network that consist of several computers that have a certain server, which is responsible for all the tasks need to be done by the clients. The most relevant advantage of Client/Server networking over peer-to-peer networking is the fact that the client/server networking serves security to its clients along with the variety of the available shared devices (including printers, scanners and other devices).

This was information that I had recalled from previous studies. So I have made a little research about the computer networks and it seemed that networks have the same meaning behind its concept.

The techniques of communication between a pair of stations on a network can be classified into two broad categories.

Switched network methodology and Broadcast Methodology

In the switched network methodologies, the network consists of a set of interconnected stations, among which information is transmitted from source to destination through different routes, which is controlled by the switching mechanism.

In case of broadcast network, each station is a transmitter-receiver pair and is attached to the transmission medium, which is shared by all stations. Any transmission done by any one of the stations is received by all the stations of the network.

There are also technologies that are designed to serve specific network purpose. For instance, LAN technologies are designed to provide high-speed communication over a small geographical region, whereas WAN technologies are designed to provide communication across different cities, countries and continents. But, it has been found that isolated LANs and WANs have limited potential and usefulness. To make the computer networks more useful and suitable for many emerging applications, it is necessary to connect individual heterogeneous networks, both LAN and WAN, distributed across the world using suitable hardware and software in such a way that it gives the user the illusion of a single network.


References:

http://nptel.iitm.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Computer%20networks/pdf/ChapterContents.pdf


Questions:

To what degree can a network be secure?

Is it possible to exchange information within a network without the access of Internet?

What challenge that a network might face?


Computer Networks

Presenter

Khaled Harras