Slide 1

Transcript Slide 1

Chapter 12
Introduction to the Internet
Ruth Watson
Operating Systems Concepts 1/e
Ruth Watson
Chapter 12
Objectives (1 of 2)
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Differentiate between the Internet and the World
Wide Web
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List at least three application protocols from the
TCP/IP suite
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Explain the directory structure of a given URL
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Explain what IIS is
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Demonstrate how to install IIS
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Explain what Internet Services Manager is for
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Demonstrate how to create a simple web page
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Objectives (2 of 2)
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Explain the difference between a search engine and
a subject guide
Describe how web content is indexed
Explain the role of a Meta tag
Demonstrate how double quotes can help narrow a
search
Explain what Boolean operators are and list three
List at least two clues that can be used to determine
the validity of a web site
Define portal
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Introduction
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The Internet and the World Wide Web are
not the same
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The World Wide Web is the multimedia portion of
the Internet
In 2000 there were more than three million
people worldwide using the Internet
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Important Terms to Understand
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Apache Web Server
Browser
CERN
Circuit switching
FTP
Gopher
HTML
HTTP
Internet
Meta tag
Mosaic
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Packet switching
Portal
Robot
Search engine
Site map
Spider
Telnet
URL
Web Server
World Wide Web
Yahoo
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The Internet
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A network of networks
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Began in 1969
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No central authority
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ARPAnet (Advanced Research Projects Agency)
Therefore, impossible to state the precise size
The Internet is not free just because you do
not pay for it
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The World Wide Web
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A subset of the Internet consisting of all
computers with hypertext or hypermedia
documents
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These documents contain references (links) to
other documents which may be on a different
computer anywhere in the world
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Began in 1991 at the European Particle Physics
Laboratory (CERN) in Switzerland
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Internet Protocols
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TCP/IP: (Transmission Control
Protocol/Internet Protocol)
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HTTP: (Hypertext Transfer Protocol)
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Suite of protocols to allow multiple platforms to
communicate
Most common protocol used on the Internet for
Web pages
FTP: (File Transfer Protocol)
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Allows files to be transferred over the Internet
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How do you get there from here?
Uniform Resource Locator (URL)
http://www.annex.com/southwest/museum.htm
Document
Path (Directory or Folder)
Internet Address (Web site)
Means of access,
HyperText Transfer Protocol
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Directory Structures on a Web Server
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You can guess the URL
using the general form:
www.company.com
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Examples:
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www.microsoft.com
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www.nba.com
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www.dell.com
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www.whitehouse.gov
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www.miami.edu
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What Makes a Web Server a Web Server?
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Install Internet
Information Services
to make your server a
Web server
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Allows you to manage
Internet services,
such as:
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FTP
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SMTP
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Become a Webmaster
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Manage Internet
Services
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Develop Content for the
Web
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Set up Web databases
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Using HTML
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Hypertext markup
Language
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Write it, or
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Use an Editor
Does not matter which
is used, but you have
to know it to fix it!
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HTML Structure
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<HTML> </HTML>
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Head: <Head> </Head>
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Must be at beginning and end of the Web page
Includes: Basic document info
Other HTML:
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<Title></Title>
<Body BGCOLOR= “Beige”>
<H1></H1>
<P>
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Finding Resources Effectively:
Search Engines
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A program that systematically searches the Web
for documents on a specific topic
Uses a key word or words as a query
 Several search engines are available
 Each search engine has its own database
 No search engine is best
 Uses Boolean (logical) operators
 Returns “hits” or documents once search has been
submitted
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Search Tips
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Use the Search button on the Internet Explorer
Toolbar
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Try multiple search engines on one query
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Be aware of logical operators
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AND,
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OR, and
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NOT
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Search on a concept: e.g., “first ladies” rather
than “Eleanor Roosevelt”
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Set Bookmarks/Favorites
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Boolean Operators
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Specify Boolean operators
 And
 Or
- Includes all findings of both key words
- Looks for only one of the specified key words
 Not
- Allows you to exclude certain key words
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Use multiple search engines
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Read online help about search criteria used for a
particular search engine
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Other Resources
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Portals
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Libraries
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Online Magazines and
Journals
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Miscellaneous Resources
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Summary
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The Internet is a network of networks
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URL is located in the Address Box
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Hypertext and hypermedia contain links to other
documents
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Connect through ISP or LAN
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Search Engines are the tools to find information
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Learn to use keywords for searching
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Use multiple search engines
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Searches are based on Boolean operators
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HTML
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Questions?
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