Presentations text content in The Internet The Internet: A Definition
Slide1eMail
The Internet
Slide2The Internet: A Definition
Short for
Internetwork
AKA: The World Wide Web, or the Net
This is defined by the system of communications channels
Cable
Satellite
Fiber Optics
Telephone
A Network of Networks
Connected by a common set of rules: TCP/IP
Populated by services:
WWW, Communications, Data Transfer
Slide3History
Advanced Research Projects Administration
From
Dept
of Defense
Funding of Communications resourcesFirst to Universities and Tech CompaniesUCLA & SRI Int’l – 10/29/69UC Santa Barbara, U. of UtahWent international in the 70sUK, Sweden, Norway
Wikipedia, 2012
Slide4History… continued
1980s
National Science Foundation - 1981
TCP/IP standardized
Protocols that make communications possible
NSF Net expanded to allow access to supercomputers – 1985Commercial usage
CompuServe, America Online, ProdigyEmail, live chat, remote access to databases1989 – Tim Berners Lee – Hyper Text Markup Language
Protocols for graphical display of the World Wide Web
1990s
Public can surf the web with Web Browsers
Dial-Up services and special Web Browsing software
Had to pay for each
Uses in business, gaming, personal life, communications
Huge impacts!
eComerce
,
,
eCommunications
,
eActivism
So Many
eThings
!
Slide5The World Wide Web
Public can surf the web with Web Browsers
1993 – Mosaic Graphical Web Browser
1994 – Netscape Navigator
1995 – Microsoft Internet Explorer
Became and remains the #1 browserBundled with Windows (#1 Operating System)1996 – Opera (mostly used on mobile devices now)
1998 – Netscape becomes Mozilla Firefox2003 – Apple SafariBundled with the computer
2008 to 2010 – Google Chrome
Slide6How Does It Work?
Client Web Browser
URL
Browser sends DNS request
DNS returns IP
Browser sends “GET” to IP
ISPs take packets of data through many routers and networks
Server receives GET and returns packets of data
Again, networks
Local machine receives requested data
(2010, HowStuffWorks.com)
Slide7The Internet
Top of the screen is a Address Bar
This defines the URL of the website or file currently being explored
URL: Universal Resource
Locator
essentially like a street address but it doesn’t refer to an actual physical location, but a file location on a server or in a directory
http
://
www.nytimes.
com
/
gst/mostpopular.html
/
Hyper Text Transfer Protocol
Domain Name
As registered with a Domain Name Serivce
Top-Level Domain
Defining type of domain
Path or subdirectory and actual page file
How does this work?
Hyper Text Markup Language:
A simple programming language that universally tells a web browser how to set up and define a web page
Gives formatting and parameters for display
Slide8A simple web site
Start
→
Accessories
→ NotepadEnter in the text
Save As:index.htmlTo DesktopOpen with a web browser
Should automatically choose this
<html>
<head>
<title>A simple web page</title>
</head>
<body>
This is a really simple Web Page!
</body>
</html>
Slide9Navigating the Internet
Very large with well over
30
billion registered websites
Also full of questionable contentIdentify some useful Search Engines:
http://www.yahoo.com/
http://www.google.com/
http://www.bing.com/
http://www.ask.com/
Slide10
Let’s compare these web search engines…
Everyone choose at least one of these services
You can open multiple tabs at the top of the web browser content frame
Brainstorm topic:
Type keywords into search bar and hit enter
Describe top 5 returned itemsWhat are they?Do they want money? Personal info?
The Internet The Internet: A Definition
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