Presentation on computer networking according to class 8th.It should be big.
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Answer:
Computer networks have shrunk the world and brought people together. They have extended the power of a computer beyond the expanse of a room. Advancements in networking techniques, protocols and so on have made a profound impact in areas of communication and learning. The size of computer networks may vary. The Internet is an example of a computer network that spreads all across the world. The Internet is also referred to as the worldwide network of computers and it is growing at a rapid rate.
A computer network
consists of two or more computers that are linked in order to share resources such as printers, exchange files and allow communication.
Let us learn more about computer networks.
NEED FOR COMPUTER NETWORKS
Nowadays, computer networks are a vital part of any organisation. Some of the advantages of computer networks are:
Resource Sharing: All computers in a network can share resources such as printers, fax machines, modems and scanners.
File Sharing and Remote Database Access: A computer network allows sharing of files and access to remote database. We can easily access the files stored on various computers on a network. Also, networking allows many people to work simultaneously on the data stored in a database.
Ease of Communication: Computer networks allow people to communicate through emails and instant messaging facilities. This makes the transmission of information easier, more efficient and less expensive.
TYPES OF COMPUTER NETWORKS
The following are the types of networks based on the geographical area covered or scale of the network.
Personal Area Network (PAN):
A PAN is a computer network organised around a person. It is used for communication between devices such as phones, personal digital assistants, printers and laptops that are in close proximity. We can use these networks to transfer files and photos between the various devices
Local Area Network (LAN):
A LAN is a computer network that is limited to a local area such as a laboratory, a school or an office building. Cables (wires) or low-power radiowaves (wireless) are used for the connections in a LAN. A wireless LAN (or WLAN) is also sometimes called LAWN (Local Area Wireless Network).
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Campus Area Network (CAN):
A CAN is a computer network that connects multiple local area networks (LAN) in a limited geographical area. A CAN is smaller than a wide area network (WAN) or metropolitan area network (MAN). It can be set up by a college, company and so on.
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Metropolitan Area Network (MAN):
A MAN is a computer network that usually covers a larger area than a LAN. For example, a network that connects two offices in a city, a neighbourhood area and so on.
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Wide Area Network (WAN):
A WAN is a computer network that spans a wide geographical area. A WAN may be spread across cities, countries and continents. A WAN is formed by connecting LANs and MANs. Computers or networks across long distances are usually connected with optical fibre cables, satellite radio links or microwave radio links.
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NETWORK TOPOLOGIES
Topology refers to the layout pattern in which various computers are connected to one another to form a network. The computers on a network are also referred to as nodes.
There are four main types of topologies. They are:
Bus Topology: In bus topology, all the computers are connected to a single cable called the bus (Fig. 1.6). The transmission of data from any computer travels through the length of the bus in both the directions and can be received by all other computers on the network. If the address of a computer is that of the intended recipient, it accepts the data; otherwise, the data is rejected. The advantage of the bus topology is that it is quite easy to set up. However, a network cannot function if there are breaks in the bus.
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