The Internet The Internet Chapter 6 Chapter 6 Chapter 6: The Internet 2 6 Chapter Contents  Section A: Internet Technology  Section B: Fixed Internet Access  Section C: Portable and Mobile Internet Access  Section D: Internet Services  Section E: Internet Security Chapter 6: The Internet 3 6 SECTION A Internet Technology Internet Technology  Background  Internet Infrastructure  Internet Protocols, Addresses, and Domains  Connection Speed Chapter 6: The Internet 4 6 Background  The ARPANET, created in 1969, connected computers at UCLA, Stanford Research Institute, University of Utah, and University of California at Santa Barbara  Today, the Internet connects computers all over the globe and supplies information to people of all ages and interests  With an estimated 200 million nodes and 1 billion users, the Internet is huge Chapter 6: The Internet 5 6 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)  NSP equipment and links are tied together by network access points (NAPs)  An Internet service provider (ISP) is a company that offers Internet access to individuals, businesses, and smaller ISPs Chapter 6: The Internet 6 6 Internet Infrastructure Chapter 6: The Internet 7 6 Internet Infrastructure  To communicate with an ISP, your computer uses some type of communications device, such as a modem Chapter 6: The Internet 8 6 Internet Protocols, Addresses, and Domains Chapter 6: The Internet 9 6 Internet Protocols, Addresses, and Domains  A domain name is a key component of Web addresses, e-mail addresses, and addresses on the Web called URLs Chapter 6: The Internet 10 6 Internet Protocols, Addresses, and Domains [...]... carried to the satellite dish where it is converted to another frequency, amplified, and transmitted Chapter 6: The Internet 21 6 Satellite Internet Service Chapter 6: The Internet 22 6 Fixed Internet Connection Roundup Chapter 6: The Internet 23 6 SECTION C Portable and Mobile Internet Access Wi-Fi Hotspots Portable and Mobile WiMAX Portable Satellite Service Cellular Data Service Chapter 6: The Internet. .. speeds are the same, you have a symmetric Internet connection  Internet connection options – Fixed Internet access – Portable Internet access – Mobile Internet access Chapter 6: The Internet 13 6 SECTION Fixed Internet Access B Dial-up Connections DSL, and Dedicated Lines Cable Internet Service Satellite Internet Service Fixed Wireless Service Fixed Internet Connection Roundup Chapter 6: The Internet. .. Chapter 6: The Internet 30 6 Voice over IP Advantages – Low cost – Flexibility – Phone number moves with you Disadvantages – Quality can vary – Must have power to work Chapter 6: The Internet 31 6 FTP Chapter 6: The Internet 32 6 FTP Chapter 6: The Internet 33 6 File Sharing  P2P file sharing uses peerto-peer (P2P) protocols that allow users to obtain files from other users located anywhere on the. .. technologies Chapter 6: The Internet 26 6 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 Chapter 6: The Internet 27 6 SECTION Internet Services... always-on broadband Internet access over the same infrastructure that offers cable television service Chapter 6: The Internet 19 6 Cable Internet Service Cable modems convert your computer’s signal into one that can travel over the CATV network Always-on connection Chapter 6: The Internet 20 6 Satellite Internet Service Satellite Internet service distributes alwayson, high-speed asymmetric Internet access... sharing Chapter 6: The Internet 28 6 Real-Time Messaging A networked-based real-time messaging system allows people to exchange short messages while they are online – Instant messaging (IM) – Chat Chapter 6: The Internet 29 6 Voice over IP  VoIP (Voice over Internet Protocol) or Voice over IP, is a technology in which a broadband Internet connection is used to place telephone calls instead of the regular... T4 lines are leased from the telephone company, and offer fast, highcapacity data transmission Chapter 6: The Internet 17 DSL, and 6 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 Chapter 6: The Internet 18 6 Cable Internet Service Cable Internet service distributes... the Internet  BitTorrent is a file sharing protocol that distributes the role of file server across a collection of dispersed computers Chapter 6: The Internet 34 6 SECTION Internet Security E Intrusion Attempts Securing Ports Routers and NAT Virtual Private Networks Chapter 6: The Internet 35 6 Intrusion Attempts An intrusion is any access to data or programs by hackers, criminals, or other... Chapter 6: The Internet 11 6 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 – Ping – Traceroute Upstream vs downstream speed Chapter 6: The Internet 12 6 Connection Speed  When upstream speeds differ from downstream speeds, you have an asymmetric Internet. .. 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 Chapter 6: The Internet 15 6 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 Chapter 6: The Internet 16 DSL, ISDN, and 6 Dedicated . The Internet The Internet Chapter 6 Chapter 6 Chapter 6: The Internet 2 6 Chapter Contents  Section A: Internet Technology  Section B: Fixed Internet. addresses on the Web called URLs Chapter 6: The Internet 10 6 Internet Protocols, Addresses, and Domains Chapter 6: The Internet 11 6 Internet Protocols,