Internet Infrastructure

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1 THE INTERNET 1

2 Background Created in 1969, connected computers at UCLA, Stanford Research Institute, U. of Utah, and UC at Santa Barbara With an estimated 200 million nodes and 1 billion users, the Internet is connects people of all ages and interests 2

3 Internet Infrastructure The Internet is not owned or operated by any single corporation or government The Internet backbone is a network of highcapacity communications links that provides the main routes for data traffic across the Internet Backbone links and routers are maintained by network service providers (NSPs) An Internet service provider (ISP) is a company that offers Internet access to 3

4 Internet Infrastructure Network Access Points 4

5 Internet Infrastructure To communicate with an ISP, your computer uses some type of communications device, such as a modem 5

6 Internet Protocols, Addresses & Domains 6

7 Internet Protocols, Addresses & Domains A domain name is a key component of Web addresses, addresses, and addresses on the Web called URLs 7

8 Internet Protocols, Addresses & Domains 8

9 Connection Speed Data travels over the Internet at an incredible speed The elapsed time for data to make a round trip from point A to point B and back to point A is referred to as latency Upstream vs. downstream speed 9

10 Dial-up Connections A dial-up connection is a fixed Internet connection that uses a voiceband modem and telephone lines to transport data between your computer and your ISP 10

11 Dial-up Connections A voiceband modem converts the signals from your computer into signals that can travel over telephone lines Modem speed is measured in bits per second 11

12 DSL, ISDN, and Dedicated Lines DSL is a high-speed, digital, always-on Internet access technology that runs over standard phone lines Most DSL installations require service technicians DSL modem 12

13 Cable Internet Service Cable Internet service distributes always-on broadband Internet access over the same infrastructure that offers cable television service 13

14 Cable Internet Service Cable modems convert your computer s signal into one that can travel over the CATV network Always-on connection DOCSIS-compliant cable modems 14

15 Satellite Internet Service Satellite Internet service distributes always-on, high-speed asymmetric Internet access by broadcasting signals to and from a personal satellite dish A satellite modem is a device that modulates data signals from a computer into a frequency band that can be carried to the satellite dish where it is converted to another frequency, amplified, and transmitted 15

16 Satellite Internet Service 16

17 Fixed Internet Connection Roundup 17

18 Internet To Go Portable Internet access can be defined as the ability to easily move your Internet service from one location to another Mobile Internet access offers a continuous Internet connection as you are walking or riding in a bus, car, train, or plane 18

19 Wi-Fi Hotspots A Wi-Fi hotspot is an area in which the public can access a Wi-Fi network that offers Internet service Wi-Fi does not typically provide acceptable mobile Internet access because you can only remain connected within range of the network s hotspot 19

20 Cellular Data Services Using cellular phone technology to access the Internet offers mobility that is not yet possible with most of today s wired or wireless computer network technologies 20

21 Cellular Data Services The fastest cellular technologies for Internet access are EDGE, EV-DO, and HSUPA Most cellular service providers offer a data service plan for accessing the Internet You can use a cellular-ready PDA, such as Palm Treo, Blackberry, HP ipaq, or Dell Axim to directly access the Internet 21

22 Routers 22

23 Web Basics The Web is an interlinked collection of document, image, video, and sound files A Web site contains a collection of related information 23

24 Web Basics A Web page is the product of one or more Webbased files displayed in a format similar to a page in a book A Web browser is software that displays Web page elements and handles links between pages Every Web page has a unique address called URL URL stands for Uniform Resource Locator 24

25 HTML Hypertext Markup Language Set of specifications for creating documents that a browser can display as a Web page Provides a means to describe the structure of text-based information in a document 25

26 HTML 26

27 Web Browsers Help you access Web pages Upgrade to new browser versions as they become available Popular browsers: Google Chrome Internet Explorer Mozilla Firefox Apple Safari Netscape Navigator Opera 27

28 Search Engine A Web search engine is a program designed to help people locate information on the Web by formulating simple keyword queries 28

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