vrpt computer network(1)

8/3/2019 VRPT Computer Network(1)

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By

M J Niranjan

P Vignesh Kumar


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What is Network?y Network is a connection among more than one

communicational devices.

y Examples of Communicational devices:Computer

Mobile

Pager


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Types of Networky Personal Area Network (PAN)

y Local Area Network (LAN)

y Metropolitan Area Network (MAN)

yWide Area Network (WAN)

y Campus Area Network (CAN)

y Global Area Network (GAN)yVirtual Private Network (VPN)


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Local Area Network (LAN)


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Metropolitan Area Network (MAN)


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Wide Area Network (WAN)


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OSI Model(Open System

Interconnection)y Model defines a networking framework for

implementing protocols in seven layers.

y Control is passed from one layer to the next, starting atthe application layer in one station, and proceeding tothe bottom layer, over the channel to the next stationand back up the hierarchy.


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Network Topologyy The physical arrangement for connecting the various

computers for networking is called Topology.

y T

ypesBusStar

Ring or circular

Mesh

Tree

Hybrid

Daisy chain


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Bus Topology


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Ring Topology


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Star Topology


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Tree Topology


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Network Devicesy also known as communication devices.y they constitute a data communication network.y These devices are

RoutersSwitchesHubsLAN cardsGateway

Modemshardware firewallCSU/DSUISDN terminals andTransceivers.


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Hub yA hub is a centralized networkcommunication device.

y It is mostly used in the star

topology and when a failureoccurs at one computer, it doesnot affect the other computers.

y Types of Hub

PassiveActive and

Intelligent.


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Switchesy It is used to send and receive the data over the LAN

and WAN.


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Routersy It is used to connect two

logically and physicallydifferent networks, two

LANs, two WANs and aLAN with WAN.


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Bridgesy It is used to connect one segment of the network with

another that uses the same protocol.


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GatewayyA gateway is a network point that acts as an entrance

to another network.


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Network Administrationy Network administration is an arduous task.

y The administrator's responsibilities often involve

many different aspectsy and may include such tasks as network design,

management, troubleshooting, backup and storage,documentation, security and virus prevention as well

as managing users.


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Conclusiony The sharing of information, images, videos, songs and

etc., are made easy by the network.

yEven though it gives many facility, it has someproblems.

y The hackers can get the data through network or virusmay also affect our computers.

y This problems can be overcome by proper networkadministration.

y So, with good network administration we can have lotmore gaining of network.


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Referencey Books Internet Concept and Web Designing

-I.Edwin Dayanand

-R.K.SelvaKumar

Computer Networks

-Rathi Narayan


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Time for Questions


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Thank you

vrpt computer network(1)

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