Computer network is a means in which two or more computers are interconnected for numerous reasons. One of which is to connect data between thic computer electronically. Also computer networks are connected for the purpose of sharing resources between the computers connected.
Types of networks are defined by the geographical environment of a network. In addition, the differences between the schemes of these networks also involve distance and orientation. Typically, it is central-oriented and uses a telephone line or relies on a microwave relay to transmit data.
There are three basic types of computer networks:
Local Area Network (LAN)
Metropolitan Area Network (MAN)
Wide Area Network (WAN)
1. Local Area Network (LAN) – Computer Network
These types of LAN networks are usually limited to small geographical restrictions such as networks that cover a building, school, office or campus. The basic function of LAN is as a network that connects a number of computers in a limited area such as on a university campus, in a building and in a room and is often connected to a mainframe computer or a computer. However, rarely do LAN networks cover more than a mile away.
These computers can be connected to various methods such as twisted or twisted pair cables, optical fibres, telephone lines, and infrared light and radio signals.
Each topology needs to perform the same job. The most common situations a network encounters are messages from one computer to another or instructions to run programs stored on the network. The data or program requested by the message may be stored on a computer used by a colleague on the network or on a file server (server), a specific computer.
File servers are usually high-power computers and have hard disk drives that are not used exclusively by individuals on the network as well as compact CD drives. The file server should also have all the software that controls the management of that network system. In addition, the file server exists only to serve all computers located on the network system. Computers connected to file servers are known as workstations.
Workstations are not necessarily as powerful as computer servers but they can have additional software on their hard drive. Meanwhile, each computer that uses a file server service is called a client. The printer can also be connected to the network so that it is accessible to all LAN customers.
To use it, the network must accept requests from individual computers or nodes connected to the network, and it must have a way of handling simultaneous requests for its services.
Once a computer receives network service, it should have a way of sending messages from one computer to another so that it only points to the required node and does not appear on another computer. The network should do all this as quickly as possible, providing its services as efficiently as possible in turn among other nodes in the LAN.
There are three types of topological networks commonly used in LAN configuration for client-client networks. These networks are:
- The topology of Bus or Linear Bus
- Star (Spider) Topology
- Token Ring Topology
2. Metropolitan Area Network – Computer Network
The Metropolitan Area Network (MAN) typically covers a relatively large geographical area compared to the network covered by LAN. The MAN network usually operates in cities, affiliates of several schools or in one district.
By running a very simple communication network within a large geographical layout, information and information can be disseminated widely, quickly and effectively.
Public libraries and government agencies usually prefer to use MAN to connect with locals and private sector management. An example of MAN use is in Pasco County located in Florida, United States.
The MAN network is known as ‘the MIND Network’ where it connects all Pasco media centres to centralized mainframe computers located in the district office using telephone lines, coaxial cables, wireless communication tools providers).
In business, for example, a personal computer transmits data to a single computer or mainframe. Because larger or more powerful computers are actually designed as servers, they function to allow any access to a terminal, a personal computer can communicate with a computer or mainframe.
This will only happen if the personal computer can compete or resemble a terminal. Therefore, this network will be successful when the personal computer is equipped with terminal emulation software. The larger computer then responds to the personal computer or work station as another user in the network of input-output communications.
3. Extensive Line (WAN) – Computer Networks
Wide Area Network (WAN) connects a broader geographical area, for example connecting Florida, the United States with the world.
The WAN network is able to connect Florida schools with other places in the world such as Tokyo in just minutes, without having to spend a lot of money to pay for their phone bills. However, this WAN network is rather complex and complex. It requires a variety of hardware and software before enabling local and metropolitan networks to communicate globally and internationally such as the Internet. At birth, the WAN network looks almost identical to the LAN or MAN.
Typical Area Networks combine two or more Local Area networks and typically involve a large geographical area. For example, a company has a headquarters in one place, a factory in another and a marketing mix in an area that is quite far from both.
In conclusion, When a smaller computer is connected to a larger computer, the connection is referred to as the micro-to-framework connection. The large computer where the terminal or personal computer is connected is known as a host computer. If a personal computer is used as a terminal, file transfer software allows the user to transfer files from the host or send data to the host (upload). Downloading files means opening and retrieving data from another personal computer. And sending the data to the appropriate computer as requested by the user. Uploading a file means that the user opens the data file and sends it to another computer.