8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 1/16

Overview Of Network, Part-1

P R E S E N T E D B Y :K ES HA V P AR EE K  

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 2/16

Network ?

y A network is a group of two or more entities linkedtogether.

y Computer Network ?

y A network consists of two or more computers thatare linked in order to share resources (such asprinters and CDs), exchange files, or allow electroniccommunications. The computers on a network may 

 be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 3/16

 Why Network ?

y Easiness«..

y No distance«..

y Mobility«..

y Efficient«..

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 4/16

Network Devices

y W irey W ireless

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 5/16

R outer, Switch, Hub, Modem

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 6/16

Characteristic Of Network 

y The following characteristics are used to categorizedifferent types of networks:

Topology:y The geometric arrangement of a computer system.

Protocoly The protocol defines a common set of rules and signals that computers

on the network use to communicate.

 A rchitecturey Networks can be broadly classified as using either a peer-to-peer or

client/server architecture.

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 7/16

Topolog y 

y Topology refers to the shape of a network, or thenetwork's layout. How different nodes in a network 

are connected to each other and how they communicate are determined by the network'stopology. Topologies are either physical or logical.

There  A re five most common network topologies.

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 8/16

Topolog y 

y Mesh Topology 

y Star Topology 

y Bus Topology 

y R ing Topology 

y Tree Topology 

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 9/16

Mesh Topolog y 

y Devices are connected with many redundantinterconnections between network nodes. In a truemesh topology every node has a connection to every 

other node in the network.

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 10/16

Star Topolog y 

y A ll devices are connected to a central hub. Nodescommunicate across the network by passing datathrough the hub.

y These Devices include Computers,network sharingPrinters, Cable or DSL modems, a Local Network 

 backbone and Hubs.

y Connected By twisted pair Cabling

y Connectors RJ-45s,  W hile Phone is connected withRJ-11s You may have upto 1024 Nodes on a startopology N/ W at speed upto 100 MBPS

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 11/16

Star Topolog y 

HUB

Nodes

Nodes

Nodes

Nodes

Nodes

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 12/16

Bus Topolog y 

y A ll devices are connected to a central cable, calledthe bus or backbone.

y On a Bus topology n/w one machine is plugged to the

next , which is plugged to the next and so ony Connected by Coaxil or ³Thin Ethernet´ cable.

y Bus topology n/w are limited to 30 machine and at bandwidth of 10MBPS

y Example:  A  television cable, each end specially terminated by use of ³terminating register´

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 13/16

Bus Topolog y 

Terminator Terminator

Coax Cable

Nodes NodesNodesNodes Nodes

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 14/16

R ing Topology 

y A ll devices are connected to one another in the shapeof a closed loop, so that each device is connecteddirectly to two other devices, one on either side of it.

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 15/16

Tree Topology 

y A hybrid topology. Groups of star-configurednetworks are connected to a linear bus backbone.

Backbone

8/7/2019 Overview of Network, Part-1

http://slidepdf.com/reader/full/overview-of-network-part-1 16/16

Thanks