Computer networks means a collection of autonomous computers interconnected by a single technology. But what is mean by autonomous computers😒?let's discuss😁We know the Internet is a network of networks, and autonomous systems are the big networks that make up the Internet. If a device is connected to the internet then we can say that it is also connected to the autonomous system. So, networks are collections of autonomous computers interconnected by a single technology.
Uses of computer networks:
It is quite interesting part to know the uses of computer networks:
1.Bussiness Application:
A company's information will be consisting of more databases and if there is a need for employees to access them, then in this scenario the data are stored on powerful computers called servers. The employees have simple machines called clients on their desks with which they access remote data.
If we observe the picture 🧐, we see two programs running. One is on the client machine and another is on the server machine. The client process sends a message to the server using the network. The client's process waits for the reply message. After the server receives the message, the server performs the request and sends back a reply.
Communications are made possible by computer networks. Video is added to voice calls so that employees need to travel long distances to attend the meetings
2.Transmission Technology
Internet access provides home users with connectivity to remote computers. Home users can now access information, can communicate with others, can do shopping. Here we use something called peer-to-peer communication. In this communication there is no fixed division into clients and servers, every person can communicate with one or more than one person. Peer-to-peer communication is used to share music,vidoes,photos. An email will also come under peer-to-peer.
Let's discuss about technical issues involved:
Network Hardware:
Computer networks are classified into two types:
1.Transmission Technology
1.1 Broadcast links:
On a broadcast network, the communication channel is shared by all the machines on the network, and packets sent by one particular machine are received by all the others. An address field of each packet is specified . After receiving a packet, a machine checks whether the address field matches or not . If the address field matches the machine processes the packet else it ignores the packet.
1.2 Point-to-point links:
Point-to-point links connect individual pairs of machines. In certain contexts, we call short messages as a packet, which may have to visit one or more intermediate machines. If we find only one sender and one receiver we call it unicasting.
2.Scale
2.1 Personal Area Networks:
Here the communication will be over a range of a person. Think of an example of PAN. The connection between Bluetooth and a smartphone is an example of PAN. PANs can also connect laptops, tablets, printers, keyboards, and other computerized devices.
PAN network connections can either be wired or wireless. Wired connection methods include USB and FireWire; wireless connection methods include Bluetooth, WiFi, and IrDA.
2.2Local Area Network:
A LAN is a privately owned network that operates within and nearby a single building.LANs are used to connect personal computers to exchange information. In these systems, every computer has a radio modem and an antenna that it uses to communicate with other computers.
2.3 Metropolitan Area Networks:
A MAN covers a city. The cable television networks available in many areas are examples of MAN. Cable television is not only MAN but nowadays calling it WiMAX.
2.4 Wide Area Network:
A WAN covers a large geographical area like a country, or continent.WANs are used to connect LANs and other types of networks. so that users and computers in one location can communicate with users and computers in other locations.
That's a wrap for today!!Thanks for reading this article💖.I will be writing blogs every week please check out for new content😊.
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