Chapter 2 The Internet and World Wide Web

1
Chapter 2The Internet and World Wide Web
2
Chapter 2 Objectives
Explain how to access andconnect to the Internet
Explain how to view pages and searchfor
information on the Web
Explain how e-mail, FTP, newsgroupsand message
boards, mailing lists, chat rooms,Instant
messaging, and Internet telephony work
Describe the types of Web sites
Identify the rules of netiquette
Identify the steps requiredfor Web publishing
3
The Internet

• Network - Collection of computing devices
  connected together to share resources
• Internet Global network of networks enabling
  people to communicate, collaborate and share
  information and resources.

World Wide Web Multimedia portion of the
Internet.
4
The Internet

• Who controls the Internet?

• No oneccit is a public, cooperative,
  andindependent network
• Several organizations set standards

p. 51
5
History of the Internet

• Late 1960s DODs ARPANET
  (Advanced Research Project Agency
  Network )
• 1980s NSFs CSnet (connecting all US
  universities)
• Domain Name System
  established
• Early 1990s - World Wide Web
• Graphical browser
• By 2000 Extensive global use

p. 69
6
The Internet

• How has the Internet grown?

p. 50
7
Applications of the Internet

• Communication email and chatting / messaging
• Browsing / research accessing the Web
• E-commerce buying, selling and trading online
• Other telephony, newsgroups, ftp, etc.

8
How the Internet Works

• Protocols (standard language)
• Ensure that devices communicate in a uniform and
  manageable manner
• Internet backbone (physical infrastructure)
• Consists of national and international
  communication networks
• Internet service providers (ISP)
• Provide users with physical connection/access to
  the Internet
• Provide other services such as email, web hosting

9
How the Internet Works

• Protocols for the Internet
• Transmission Control Protocol (TCP)
• Internet Protocol (IP)
• Hypertext Transfer Protocol (HTTP)
• File Transfer Protocol (FTP)
• Internet
• A packet switching network
• Client/server
• Client makes a service request
• Server provides the service

10
How the Internet Works

• How can you connect to the Internet?

• High-speed connection

• Slow-speed technology

• Dial-up accessmodem in your computer uses a
  standard telephone line to connect to the
  Internet

DSL, cable modem,fixed wireless, Wi-Fi, and
satellite modems
Connection is always onwhenever the computer
is running
Connection must be established each time you log
on. Slow but inexpensive
p. 51 - 52
11
How the Internet Works

• What is a domain name?

• Text version of Internet protocol (IP) address

• Number that uniquely identifies each computer or
  device connected to Internet

p. 53 - 54 Figs. 2-3 2-4
12
The World Wide Web
What is the World Wide Web (WWW)?
p. 54
13
The World Wide Web

• What is multimedia?

• Application integrating text with other media
  elements

• Graphics
• Animation
• Audio
• Video
• Virtual reality
• Plug-ins

p. 64 - 66 Fig. 2-13
14
The World Wide Web

• What is a Web browser?

• Program that allows you to view Web pages

p. 54
15
The World Wide Web

• How does a Web browser display a home page?

Step 3.The Web browser communicates with the
access providers server to retrieve the IP
address. The IP address is sent to your computer.
p. 55 Fig. 2-5
16
The World Wide Web

• What is a home page?

• The first page that a Web site displays
• Often provides connections to other Web pages

What is downloading?

• The process of a computer receiving information
• Depending upon connection speed, downloading can
  take from a few seconds to several minutes

What is tabbed browsing?

• The top of the browser displays a tab for each
  Web page you open

p. 55
17
The World Wide Web

• What is a URL? Uniform Resource Locator

• Unique address for a Web page
• A web server delivers the Web page to your
  computer

p. 56 Fig. 2-6
18
The World Wide Web

• What is a hyperlink (link)?

• Built-in connection to another related Web page

• Item found elsewhere on same Web page
• Different Web page at same Web site
• Web page at a different Web site

p. 57
19
The World Wide Web

• What is a search engine?

• Program used to find Web sites and Web pages by
  entering words or phrases called search text

p. 57 - 60 Fig. 2-8
20
The World Wide Web

• What are the guidelines for evaluating the value
  of a Web site?

Affiliation
Audience
Authority
Content
Currency
Design
Objectivity
p. 63 Fig. 2-12
21
The World Wide Web

• What are plug-ins?

• Programs that extend the capability of a
  browser
• You can download many plug-ins at nocost from
  variousWeb sites

p. 66 Fig. 2-15
22
Communication via the Internet

• Communication - number one use / application of
  Internet
• Asynchronous communication (email)
• Not real time (not at same time)
• Participants can leave messages to be responded
  to at recipients convenience
• Synchronous communication (chat)
• People communicate in real time
• Participants must be engaged in communication at
  the same time

23
E-mail

• What is an e-mail address?

• Unique name that consists of a user name and
  domain name that identifies the user
• jane_doe_at_tiger.towson.edu.us
• User name jane_doe
• Sub domain tiger
• Domain name towson
• Domain root/type .edu
• Country extension (optional)
  .us

p. 94 Fig. 2-27
24
Other Internet Services

• How does an e-mail message travel?

p. 70 Fig. 2-20
25
Other Internet Services

• What is a chat?

• Real-time typed conversation that takes place on
  a computer

• Chat room is a location on an Internet server
  that
• permits users to discuss
• topics of interest

p. 71 - 72 Fig. 2-22
26
E-Commerce

• What is E-Commerce?

• Short for electronic commerce
• Business transaction that occurs over the
  Internet

Business to consumer (B2C)Sale of goods to
general public
Consumer to consumer (C2C)One consumer sells
directly to another
Business to business (B2B)Business providing
goods andservices to other businesses
p. 67 - 68 Fig. 2-17
27
Other Internet Services

• What is internet telephony?

• Enables users to speak to other users over the
  Internet using their computer

p. 73 Fig. 2-24
28
Summary of the Internet and World Wide Web
History and structure of the Internet
Newsgroups and Message Boards
Chat Rooms and Instant Messaging
The World Wide Web
Internet Telephony
E-Mail
FTP
Netiquette
Chapter 2 Complete