Internet Infrastructure
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- Lynn Pearson
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1 The internet
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 high-capacity 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 individuals, businesses, and smaller ISPs 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 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 14
15 Satellite Internet Service 15
16 Fixed Internet Connection Roundup 16
17 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 17
18 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 18
19 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 19
20 Web Basics The Web is an interlinked collection of document, image, video, and sound files A Web site contains a collection of related information 20
21 Web Basics A Web page is the product of one or more Web-based 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 21
22 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 textbased information in a document 22
23 HTML 23
24 Web Browsers Help you access/see Web pages (display the information) Popular browsers: Internet Explorer Mozilla Firefox Google Chrome Apple Safari Netscape Navigator Opera 24
25 Search Engine A Web search engine is a program designed to help people locate information on the Web by formulating simple keyword queries Popular search engines: Google Bing Yahoo Ask 25
Internet Infrastructure
THE INTERNET 1 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
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