The Internet. The Internet: A Definition Short for Internetwork AKA: The World Wide Web, or the...
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Transcript of The Internet. The Internet: A Definition Short for Internetwork AKA: The World Wide Web, or the...
The Internet
The 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
History Advanced Research
Projects Administration From Dept of Defense Funding of
Communications resources
First to Universities and Tech Companies UCLA & SRI Int’l –
10/29/69 UC Santa Barbara, U. of
Utah Went international in
the 70s UK, Sweden, Norway
Wikipedia, 2012
History… continued 1980s
National Science Foundation - 1981 TCP/IP standardized Protocols that make
communications possible NSF Net expanded to allow
access to supercomputers – 1985
Commercial usage CompuServe, America Online,
Prodigy Email, live chat, remote access to
databases 1989 – 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, eMail,
eCommunications, eActivism
So Many eThings!
The 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 browser Bundled with Windows (#1 Operating System)
1996 – Opera (mostly used on mobile devices now)
1998 – Netscape becomes Mozilla Firefox 2003 – Apple Safari
Bundled with the computer 2008 to 2010 – Google Chrome
How Does It Work?
1.Client Web Browser1.URL2.Browser sends DNS request
2.DNS returns IP3.Browser sends “GET” to IP
4.ISPs take packets of data through many routers and networks
5.Server receives GET and returns packets of data
6.Again, networks7.Local machine receives requested data
(2010, HowStuffWorks.com)
The 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 directoryhttp://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
A simple web site
Open notepad Enter in the text Save As:
Simple.html To your INSM180
folder Open 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>
Navigating the Internet
Very large with well over 10 billion registered websites
Also full of questionable content Identify some useful Search Engines:
http://www.yahoo.com/ http://www.google.com/
http://www.bing.com/ http://www.ask.com/
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 items What are they? Do they want money? Personal info?
