NETWORKA brief explanation about networks

what IS NETWORK?

Network is a collection of computer and other devices like printers, scanners and so on. The computers in a network may be linked to other devices through cables, telephone lines, radio waves, satellites etc.

What is the need of networks?

To share computer files. To share resources. To enable people to communicate. To reduce speed and cost of transfer.

Type of networks

Personal Area Networks(PANs) Local Area Networks(LANs) Campus Area Networks(CANs) Metropolitan Area Networks(MANs) Wide Area Networks(WANs)

Pans

Personal Area Network is an interconnection of devices around an individual device within 5 to 10 meters.

The devices that may be used in PANs are computers, printers, fax machines, PDAs etc.

What are LANs?

The terminals or workstations in a LAN are confined to small areas such as a building or a group of buildings.

It may be up to a kilometer. For example, department of an office.

CANS A CAN covers a group of buildings like

college campus or office campus. It is basically a collection of LANs in

various buildings.

What are MANs?

The MANs lies between LANs and WANs. MANs connect two or more local area

networks or campus area networks together and is spread over a town or city.

It does not exceed 10 kilometers.For example, MAN connects the local bank

with all the branches in the city.

What are WANs?

WANs spans a large area-a country or many countries or a continent.

A WAN may connect a number of LANs, CANs, or MANs located in any part of world.

Example, WAN is the internet which is the most popular and the largest WAN.

WIDE AREA NETWORK

Network topologies

It is the geometric layout of computers and other devices. The types of topologies are:-

Linear bus topology Ring topology Star topology.

What is Linear Bus Topology?It has a common backbone cable

to which all the nodes and peripheral devices are attached.

All the devices are attached to this backbone cable.

The disadvantage of the linear bus topology is that if the backbone cable fails, then the network becomes useless.

Linear Bus Topology

RING TOPOLOGY

It connects the nodes of the network in a circular chain.

The final node in the chain connects to the first to complete the ring.

A computer has two adjacent neighbors.

The main disadvantage is that if one cable is broken, the whole network becomes useless.

RING TOPOLOGY

Star topology

There is a central switch to which all the nodes are directly connected.

Every node is indirectly connected to another node through the central hub.

The failure of any node does not cause the breakdown of the network.

The disadvantage is that if the central hub will cause a breakdown, the network is broken.

Star topology

THANKS FOR VIEWING