Download ppt - Chapter 2 p. 6 . The Internet What are some services found on the Internet? p. 68 Fig. 2-1 Next 4. Chat (4) (1) 1. E-mail (2) 2. Web

Chapter 2

p. 6

WWW.PALINFONET.COMWWW.PALINFONET.COM

The Internet

What are some services found on the Internet?

p. 68 Fig. 2-1 Next

4. Chat

(4)

(1)

1. E-mail

(2)

2. Web

(3)

3. File transfer

(5)

5. Message board

(6)

6. Instant messaging

History of the Internet

Who controls the Internet?

p. 70

World Wide Web Consortium (W3C)

Oversees research, sets standards and guidelines

Tim Berners-Lee, director

Internet2 (I2)

Internet-related research and development project

Develops and tests advanced Internet technologies

Next

No onec—cit is a public, cooperative, andindependent network

Several organizations set standards

High-speed connection

High-speed connection

Slow-speed technology

Slow-speed technology

How the Internet Works

How can you connect to the Internet?

p. 70 Next

Dial-up accessmodem in your computer uses a

standard telephone line to connect to the Internet

Dial-up accessmodem in your computer uses a

standard telephone line to connect to the Internet

Digital subscriber line (DSL), cable telephone Internet

services (CATV), cable modem provide connections using

regular copper telephone lines

Digital subscriber line (DSL), cable telephone Internet

services (CATV), cable modem provide connections using

regular copper telephone lines

Connection is always on—whenever the computer

is running

Connection is always on—whenever the computer

is running

Connection must be established each time you log on. Slow but inexpensive

Connection must be established each time you log on. Slow but inexpensive


What are ways to access the Internet?

p. 72 Fig. 2-2 Next

1. ISP, Regional or National

2. OSP (AOL and MSN, for example)

3. Wireless Internet Service Provider


How might data travel the Internet using atelephone line connection?

p. 73 Fig. 2-3 Next

Step 1. Request data from a server on Internet

Step 5. Regional ISP uses leased lines to send data to a national ISP

Step 6. National ISP routes data across the country

Step 8. Server sends data back to you

Step 2. Modem converts digital signals to analog signals

Step 3. Data travels through telephone lines to a local ISP

Step 4. Data passes through routers

Step 7. National ISP passes data to local ISP


What is a domain name?

p. 74 Figs. 2-4 – 2-5 Next

Text version of Internet protocol (IP) address Number that uniquely identifies

each computer or device connected to Internet

The World Wide Web

What is a Web browser?

p. 75 Next

MicrosoftInternetExplorer

Netscape

Mozilla

Program that allows you to view Web pages

The World Wide Web

What is downloading?

p. 76 Next

The process of a computer receiving information Depending upon connection speed, downloading can

take from a few seconds to several minutes

The World Wide Web

What is a URL?

p. 76 Fig. 2-8

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click Web Addresses below Chapter 2

Next

Unique address for a Web page

A web server delivers the Web page to your computer

The World Wide Web

What is a hyperlink (link)?

p. 77 Next

Item found elsewhere on same Web page

Different Web page at same Web site

Web page at a different Web site

Built-in connection to another related Web page location

Click to view animation

The World Wide Web

What is a search engine?

p. 78 Fig. 2-10 Next

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

The World Wide Web

What is a subject directory?


Search tool with organized set of topics and subtopics Lets you find information by clicking links rather than

entering keywords

The World Wide Web

What are the eight basic types of Web sites?

p. 80 Fig. 2-13

Portal News Informational Business/marketing Educational Entertainment Advocacy Personal

Next

The World Wide Web

What is multimedia?


Application integrating text with other media elements Graphics Animation Audio Video Virtual reality

The World Wide Web

What graphics formats are used on the Web?


BMPBMP

GIF(pronounced JIFF)

GIF(pronounced JIFF)

JPEG(pronounced JAY-peg)

JPEG(pronounced JAY-peg)

PCXPCX

PNG(pronounced ping)

PNG(pronounced ping)

TIFFTIFF

The World Wide Web

What is animation?

p. 85 Next

Appearance of motion created bydisplaying a series of still imagesin sequence

The World Wide Web

What is audio?


Music, speech, or any other sound Individual compressed sound files

that you download from the Web to your computer Common Web audio file formats are

MP3, WAV, WMA (Windows Media Audio), MPEG, RealAudio, and QuickTime

Once downloaded, you can play (listen to) the contents of the files

The World Wide Web

What is streaming audio?


Transfers data in a continuous and even flow

Enables you to listen to the sound as it downloads to your computer

Radio stations use streaming audio to broadcast over the Web

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click Streaming Media below Chapter 2

The World Wide Web

What is video?


Consists of full-motion images with soundplayed back at various speeds

MPEG (Moving Pictures Experts Group) is popular video compressionstandard

The World Wide Web

What is virtual reality (VR)?


Use of computers to simulate real or imagined environment

Appears as a three dimensional (3-D) space Used for games and many

practical applications

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

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click Plug-ins below Chapter 2

Business to business (B2B)Business providing goods and

services to other businesses

Consumer to consumer (C2C)One consumer sells directly to another

Electronic Commerce

What is e-commerce?


Business to consumer (B2C)Sale of goods to general public

Short for electronic commerce Business transaction that occurs over

the Internet

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click E-commerce below Chapter 2

Click to view video

Other Internet Services

What is e-mail?

p. 91 Next

Short for electronic mail The transmission of messages and files via a computer

network Messages can consist of simple text or can contain attachments,

such as documents, graphics, or audio/video clips Internet access providers usually provide an e-mail program Some Web sites—such as MSN Hotmail and Yahoo!—provide

free e-mail services One of the original services on the Internet

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click E-Mail below Chapter 2


What is an e-mail address?


Unique name that consists of a user name and domain name that identifies the user


What is FTP?


File Transfer Protocol—Internet standard that allows you to upload and download files with other computers on the Internet

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click FTPbelow Chapter 2


What is a chat?


Real-time typed conversation that takes place on a computer

Chat room is location on server that permits users to discuss topics of interest

Click to view Web Link,click Chapter 2, Click Web Linkfrom left navigation, then click Chat Rooms below Chapter 2

Click to view video

About Internet Addresses

Domain name: www.palinfonet.com

IP Address: 66.49.211.210 (under IP Version 4)

We could say => http://66.49.211.210

identifies the network

113 identifies specific computer on network

255 x 255 x 255 x 255 = 2**8 x 2**8 x 2**8 x 2**8

That is, 2**32 = 4 billion Internet addresses

About New IPv6 Internet Addresses

A new IP addressing scheme called IPv6 (August 2004)

will lengthen IP addresses from 32 bits to 128 bits and

will provide for 64 x 10**36 IP addresses. That is,

256 undecillion Internet addresses.

2**128 = 2**8 x 2**120 = 256 x (2**30)**4 =

256 billion x billion x billion x billion


What is instant messaging (IM)?

p. 2.33 Fig. 2-31 Next

Step 2.The server determines if any of your established friends, family, or coworkers, called buddies, are online

Step 3.You send instant messages to an online buddy

Step 1.Login to the IM server

IM Server

Step 4.Your Instant Message travels through a messaging server and then to the online buddy

messaging Server

A real-time Internet communications service that notifies you when one or more people are online and allows you to exchange messages or files