Embed Size (px)
Citation preview
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
