Computer networks

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COMPUTER NETWORKS

Presented by- Nasrin

Irshad Hussain

M.Sc IT(2nd semester)

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Presentation Contents

Introduction Computer Network Devices use to connect networks Type of network

a) LAN

b) MAN

c) WAN

d) Differences Models of network

a) Client/Server

b) Peer to Peer

c) Differences Application of networks References

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A network consists of two or more computers that are linked in order to share resources, exchange files or allow electronic communications.

The computers on a network may be linked through cables, telephone lines, radio waves, satellites or infrared light beams

Computer Networks

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Networking Devices

Routers Gateways Repeaters Bridges Hub Modem

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Hub/switch

Types of network are: Local area network (LAN), Metropolitan area network (MAN) Wide area network (WAN)

Types of Network

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Local Area Network(LAN)

Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network)

Typically, connected devices share the resources of a single processor or server within a small geographic area .

A local area network may serve as few as two or three users or as many as thousands of users.

Local Area Network (LAN)

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LAN Diagram

Wide Area Network(WAN)

The largest network of all network types. Internet is the largest WAN in the world. WAN generally covers large distances such as

states, countries or continents. WAN is a group of MANs or LANs or the mixture

of both networks.

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WAN Diagram

Metropolitan Area Network

A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network but smaller than the area covered by a wide area network (WAN).

It is also used to mean the interconnection of several local area networks by bridging them with backbone lines

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MAN Diagram

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Differences……..

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Models of Networking

Client – server model :- In a client server model

we have one server and many clients.

A server is a computer that shares information and resources with other computers on a network.

A client can share the resources of server, but a server cannot share the resources on client.

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Models of Networking

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Peer to Peer:- It is a network with all the

nodes acting as both servers and clients; each computer in the network is called a peer.

A PC can access files located on another PC and can also provide files to other PCs.

All computers in the peer-to-peer network has equal responsibilities and capabilities to use the resources available on the network.

Differences

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Application of Networks

Resource Sharing Hardware (computing resources, disks, printers) Software (application software)

Information Sharing Easy accessibility from anywhere (files, databases) Search Capability (WWW)

Communication Email Message broadcase

Remote computing The control of one or more computer systems by

another, which is at a different location

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References……

Computer Networks by Susan Shannon www.slideshare.com www.google.com

www.google.com

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