it’s here there and everywhere the internet. in perspective in perspective the internet is big....

It’s here

there

and everywhere

The Internet

in perspectivein perspective

The Internet is big.Bigger than the biggest thing ever.

It’s bigIt’s big

Much bigger than that Really amazingly immensea totally staggering sizereal ‘wow, that’s big!’ time

170 billion pages170 billion pages

Gigantic x colossal x staggeringly huge =

OK, you’ve got the message

Lesson ObjectivesLesson Objectives

Don’t panicUnderstand what the Internet isUnderstand what a browser isUnderstand how to use it efficientlyand maybe start to learn what some of

the Internet terms mean

Http isp html url jpg gif png mp3 www

backgroundbackground

1969 - Miltary network ARPANET1984 - Universities created JANET1991 - Tim Berners Lee developed WWW1993 - The first browser is only 8!1995 - The first search engine is only 6!

what is it?what is it?

Means of communicationGlobal network of computersInterconnecting computers of all sizes

The international networkThe international network

connectionsconnections

A networked computer

A web server

Telephone connection

modem

finding web sitesfinding web sites

A networked computer

A web server

Telephone connection

modem

Search engines

Get onGet on

Access Modem dials a phone

number ISP or web server

checks your ID Web browser opens You see the home

page

At the last count there were 170,421,809,001 web pagesany one could be your home pageso why stick with your ISP adverts?!

Get what you wantGet what you want

Find things you want the address bar use a url Go

favourites? Add them to your list

Been there, done that? Check out the History

Still looking?

Knowing that url stands for universal resource locator will impress peopleKnowing that http stands for hypertext transfer protocol will get you into trouble if you don’t know what protocol is

Loads of dataLoads of data

Text pagesimagesanimated graphicsvideosound filesmusicdatabasesspreadsheetspresentations

Copying other people’s files is downloadingPublishing your own is uploadingGetting rid of stuff is offloading

a 3 minute CD track can take 20 minutes to download on an average phone link

The size of files is measured in bytes

1KB = 1000 bytes

1MB = 1000KB = 1000000 bytes

The speed data travels along a phone line is measured in bits per second

I byte is about 8 bits

So a 5MB file = 5000000 x 8 = 40000000 bits

A typical phone connection speed is 40000 bits per second

So a 5MB file would take 1000 seconds = TOO LONG

the futurethe future

Dial-up connections will go out of fashionfast, always on type connections will take

overenabling high quality videoPC monitors replacing tv setswireless access via mobile phonesgenuine videophone capability

WARNING!!

Information overload

Your brain is shutting down . . .

10 9 8 7 6 5 4 3 2 1

Warning!

The Internet will seriously damage your

social life.

Warning!

The Internet will seriously damage your

social life.

The truth is out there . . .

and so is an awful lot of rubbish!

Produced by

Andrew HillNovember 2002