What is a Computer Network? Types of Computer Networks:

A computer network means an interconnection between two or more computers. This allows users to exchange data and share resources seamlessly between computers. Wireless connection is provided for connecting between multiple computers. Wireless systems use radio waves, microwaves and communication satellites.

The devices within the network that can create files, terminate, are called nodes. The Internet is the biggest example of a computer network. The computer that can provide the sharing facility is called the server computer. The server always allows sharing but does not take advantage of any sharing. On the other hand, computers on the client-server network that only take advantage of sharing but cannot provide any sharing facility are called workstations or nodes or hosts.

Objectives of Network

There are many advantages when computers are networked. The objectives of the computer network are:

  • File Sharing: Files can be shared easily between networked computers. As a result, files stored in one computer can be accessed from another computer.
  • Hardware Resource Sharing: Hardware resource sharing is a major advantage of the computa network. Pinters connected to one computer can be printed from another computer. Moreover, data stored on a hard disk can be accessed or stored on one computer.
  • Software Resource Sharing: All computers can be shared using different software on different computers without having to install the same software.
  • Low Cost: Resource sharing can cost a system implementation.
  • Increase credibility: It is possible to store multiple copies of the same file on different computers. As a result, deleting a copy can be collected from another computer. As a result, the credibility of the human network increases.
  • Balanced distribution of work: If the workload is too high on a computer, then it can be done faster by distributing it to sluggish computer.
  • higher output or higher throughput: more results are available in a short time as a result of the network.
  • Acceleration: Having multiple computers at the same time makes it possible to work faster.
  • Database Management: Computer network makes it easy to manage, control, maintain or back up all data stored centrally on a server.
  • Continued work: Office work is possible through the network even when you are away. As a result, work can be done on a continuous or continuous basis.
  • Security: Only certain users can access the network. As a result, privacy is protected.

Types of Network

The computer network can be mainly divided into four geographical categories;

  1. PAN (Personal Area Network);
  2. LAN{ (Local Area Network);
  3. MAN (Metropolitan Area Network);
  4. WAN (Wide Area Network)

PAN (Personal Area Network);

The network that is typically developed within computers and other information technology devices within an area of ​​5 meters or less is called PAN. These devices include telephone, mobile phone, PDA, printer, fax machine, scanner, digital camera, notebook, etc. Creating a PAN can have its own or wireless connection. USB and FireWare are used to create PAN. Bluetooth is used as a wireless medium for infrared. Its main features are as follows:

  • The range is limited to 5 meters.
  • Used in the exchange of information between computers and information technology devices.
  • Computer buses are connected via USB and firewire.

LAN{ (Local Area Network);

A LAN is usually a network that connects several computer terminals or other peripheral devices within an area of 5 meters or less. Most LAN workstations and computers provide connectivity. Each computer connected to the LAN has its own CUP that can execute the program. Its main features are as follows:

  • LAN topology is usually a star, ring or broadcast channel method.
  • Co-axial cable, twisted cable or optical fiber are commonly used as transmission media.
  • If the LAN is built using the conventional market, the maximum width of the LAN is 5m and the maximum of 5 repeater stations can be used in one LAN.
  • LAN can transmit PETA faster.
  • Data transmission speeds range from 1 Mbps to 4 Gbps.
  • There is a limit to the maximum number of computer connections in a LAN.
  • It can range from 5 meters to several hundred meters. But of course it’s limited to 5 miles.
  • The cost of implementing and maintaining LANs is relatively low compared to MAN and WAB.
  • Computers in the LAN provide wireless or wireless connection.
  • Technically this is known as IEEE 12.3.

LAN Classification:

Depending on the network’s control structure and service delivery, the local area network can be mainly divided into two;

  • Client-server network or server-based network;
  • Peer-to-peer networks.

Client server network:

The client-server network system uses at least one computer as a server. Multiple computers are connected to this server. These connected computers are called workstations or clients. The server serves the client. Multiple users can share server resources from different clients or workstations simultaneously. This means that multiple users will be able to access data files, pinters, various application software from the server.


That is the way it is protected.
provides security of server data.
Different resources (pinters, scanners) can be shared.

Peer-to-peer network:

The peer-to-peer network system does not have a specific server. All such computers can serve as servers or clients following the same protocol.


This network is very easy to setup and low cost.
The user can share any resource.


Its security system is very weak.
There is no centralized control over this network.
There is a problem connecting to multiple networks.

LAN Usage:

On a college campus, a large office building or an expensive peripheral device is used so that many users can use it.

LAN is used for data entry, data processing, e-mailing system.

Metropolitan Area Network MAN:

When a network is made up of more than one computer or communicating device located in different metropolitan areas, the network is called MAN. Its main features are as follows:

  • Networks area is larger than LAN.
  • Its breadth is 5k. Mr. 5 km from Can be up to
  • Telephone line, modem or in any case microwave, radio wave, infrared are used as transmission media.
  • Its distance is usually based on a city.
  • The MAN connects between multiple LANs.
  • Its speeds usually range from 1 Mbps to 5 Mbps.
  • Technically this is known as IEEE 12.3.


Used for transmitting data to a remote location within the same city.
The network is used as the backbone.

Wide area network or WAN:

Wide area network is a network when it covers a wide area through a telecommunications network. It is a computer networking system spread across multiple cities or countries or around the world. That is, WAN is the world wide Internet. In other words, when a computer networking system is set up with several important cities in one country, that network is called WAN. Its main features are as follows:

  • WAN connects multiple LANs, MAN networks.
  • This networking system uses telephone lines or microwave signals as transmission media.
  • In large countries such as India, USA, satellite media are used as transmission media.
  • Data transmission speeds typically range from 125 bps to 25 Mbps.


1 / to obtain huge data stores;

2 / electronic mail;

3/ research;

4/ on the download;

5 / Online shopping

6 / Education;

7/ is used in the clinic.

Benefits of WAN:

  • It is possible to transmit information, data and news from one place to another in an instant.
  • The memory system can store data and send it to the client in a very short time if needed.
  • The patient will be able to talk to the doctor at home, see the doctor, inform the doctor about the symptoms and symptoms of the disease by means of an electronic sensor.
  • The network can easily connect with people from any part of the world.
  • With the help of computer networks, students can apply for admission to various universities at home and collect their admit cards at home. Even the admissions of foreign university schools can be performed.
  • Students can attend any class without going to class.
  • Easy access to information and speed can be ensured.
  • A customer will be able to request the salesman to send the model of his desired product without going to the shopping center.

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