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Chapter 6 The Internet

Chapter 6 The Internet. 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. True Questions. TCP, Transmission Control Protocol,

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Chapter 6 The Internet

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  1. Chapter 6The Internet

  2. 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. True Questions • TCP, Transmission Control Protocol, • IP, internet protocol • UDP, HTTP, and FTP are examples of protocols used on the Internet. • 204.127.129.100 is an example of an IP address. • .edu and .ca are examples of top-level domains. • Internet-based servers can handle multiple tasks using different ports. Chapter 6: The Internet

  4. TCP/IP Model Data UDP header Data IP header IP data Frame Header Chapter 6: The Internet

  5. True Questions • Utilities such as Ping and Traceroute help you gauge the speed of your Internet connection. • 10 Mbps is a broadband Internet connection. • Dial-up, ISDN, and DSL [digital subscriber line] provide Internet access using telephone cabling. • Cable Internet service is fast because it has little latency. • WiMAX uses low-earth orbiting satellites to transport data to the Internet. Chapter 6: The Internet

  6. Chapter 6: The Internet

  7. True Questions • Portable Internet access includes portable WiMAX and Wi-Fi. • UTMS, Universal Mobile Telecommunications System • EDGE, and • HSUPA are examples of ????. • VoIP uses packet-switched technology to send digital data  digitization of the analog voice signal, encoding, packetization, and transmission as Internet Protocol (IP) packets over a packet-switched network. Chapter 6: The Internet

  8. Internet Technology • Background • Internet Infrastructure • Internet Protocols, Addresses, and Domains • Connection Speed Chapter 6: The Internet

  9. Question • One reason the Internet works is because TCP/IP offers a global addressing standard. • Which one of the following is accurate in the context of Internet addresses? • C. A domain name, such as amazon.com corresponds to a unique IP address. Chapter 6: The Internet

  10. Background • The ARPANET, created in 1969, connected computers at UCLA, Stanford Research Institute, Univ of Utah, and Univ of Calif 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 500 million nodes and more than 2 billion users, the Internet is huge Chapter 6: The Internet

  11. Internet Infrastructure • The Internet is not owned or operated by any single corporation or government • Internet backbone: a network of high-capacity communication links providing the main routes for data traffic across the Internet • Backbone links and routers are maintained by NSPs • network service providers (NSPs) • NSP equipment and links are tied together by NAPs • network access points (NAPs) • Internet service provider (ISP): a company provides Internet access to individuals, businesses, and smaller ISPs Chapter 6: The Internet

  12. Internet Infrastructure Chapter 6: The Internet

  13. ISP Equipment Chapter 6: The Internet

  14. Internet Infrastructure • To communicate with an ISP, your computer uses some type of communications device, such as a modem Chapter 6: The Internet

  15. Internet Protocols, Addresses, and Domains • A computer can have a permanently assigned static IP address or a temporarily assigned dynamic IP address Chapter 6: The Internet

  16. Internet Protocols, Addresses, & Domains Chapter 6: The Internet

  17. Internet Protocols, Addresses, & Domains Chapter 6: The Internet

  18. 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 measured in “ms”, miliseconds, .001 second • 3 milliseconds — a housefly's wing flap • 5 milliseconds — a honey bee's wing flap Chapter 6: The Internet

  19. This time is referred to as latency • Ping • Traceroute • Upstream vs. downstream speed Chapter 6: The Internet

  20. Connection Speed • asymmetric Internet connection: • upstream speeds differ from downstream speeds • symmetric Internet connection: • upstream and downstream speeds are the same • Internet connection options • Fixed Internet access • Portable Internet access • Mobile Internet access Chapter 6: The Internet

  21. Fixed Internet Access • Dial-up Connections • DSL, ISDN, and Dedicated Lines • Cable Internet Service • Satellite Internet Service • Fixed Wireless Service • Fixed Internet Connection Roundup Chapter 6: The Internet

  22. Question • Although ISPs offer Internet access though dial-up, satellites, WiMAX, ISDN, and DSL, cable Internet is currently the preferred access method. Why? • B. It is the fastest and most widely available technology. Chapter 6: The Internet

  23. Dial-up Connections • Dial-up connection is a fixed Internet connection • It uses a voiceband modem and • telephone lines to transport data • between your computer and your ISP Chapter 6: The Internet

  24. Dial-up Connections • Voiceband modem converts signals from your computer into audible analog signals that travel over telephone lines • Modem speed is measured in bits per second Chapter 6: The Internet

  25. T1, T3, and T4 lines are leased from the telephone company and offer fast, high-capacity data transmission DSL is a high-speed, digital, always-on Internet access technology that runs over standard phone lines DSL modem Dedicated Lines,DSL, and ISDN Chapter 6: The Internet

  26. Cable Internet Service • Cable Internet service distributes always-on, broadband Internet access over the same infrastructure that offers cable television service Chapter 6: The Internet

  27. 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 Chapter 6: The Internet

  28. 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 Chapter 6: The Internet

  29. Symmetric vs Asymmetric • Asymmetric is greater toward the customer premises (known as downstream) than the reverse (known as upstream). Chapter 6: The Internet

  30. Satellite Internet Service Chapter 6: The Internet

  31. Fixed Wireless Service • Fixed wireless Internet service broadcasts signals in order to offer Internet access to large areas • WiMAX • A WiMAX system transmits data to and from WiMAX antennas mounted on towers • Under ideal conditions, WiMAX can transmit data at 70 Mbps Chapter 6: The Internet

  32. Fixed Internet Connection Roundup Chapter 6: The Internet

  33. Portable and Mobile Internet Access • Internet to Go • Wi-Fi Hotspots • Portable and Mobile WiMAX • Portable Satellite Service • Cellular Data Service Chapter 6: The Internet

  34. Question • 062300 What is the difference between portable Internet access and mobile Internet access? • A. With portable access you cannot work online while moving very far. . Chapter 6: The Internet

  35. 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 Chapter 6: The Internet

  36. Wi-Fi Hotspots • A Wi-Fi hotspot is an area in which the public can access a Wi-Fi network that offers Internet service Chapter 6: The Internet

  37. Portable and Mobile WiMAX • WiMAX can be both portable and mobile. • Mobile WiMAX Chapter 6: The Internet

  38. Internet Services • Real-Time Messaging • Voice over IP • Cloud Computing • Grid Computing • FTP • File Sharing Networks Chapter 6: The Internet

  39. Do Not TEXT and DRIVE ! Chapter 6: The Internet

  40. 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

  41. 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 phone system Chapter 6: The Internet

  42. Wikis, Blogs, and Tweets • A wiki allows participants to modify material • A blog (short for Web log) is similar to an online diary; it is maintained by one person and contains a series of entries on one or more topics • A tweet is a short message of 140 characters or less, posted to the Twitter Web site Chapter 6: The Internet

  43. Wikis, Blogs, and Tweets Chapter 6: The Internet

  44. Cloud Computing • The concept of cloud computing depends on a grid of servers and storage devices that offer Internet-accessible computing services ranging from hardware to office productivity applications and complex corporate data processing • Google Apps • Amazon’s Elastic Compute Cloud Chapter 6: The Internet

  45. Cloud Computing Chapter 6: The Internet

  46. Grid Computing • A grid computing system is a network of computers harnessed together to perform processing tasks • SETI@home project Chapter 6: The Internet

  47. FTP Chapter 6: The Internet

  48. File Sharing • P2P file sharing uses peer-to-peer (P2P) protocols that allow users to obtain files from other users located anywhere on 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

  49. Internet Security • Intrusion Attempts • Securing Ports • Routers and NAT • Virtual Private Networks Chapter 6: The Internet

  50. Intrusion Attempts • An intrusion is any access to data or programs by hackers, criminals, or other unauthorized persons • Looking for open ports is one of the most common ways of gaining unauthorized access to a network-based computer • A port probe (or port scan) uses automated software to locate computers that have open ports and are vulnerable to unauthorized access Chapter 6: The Internet

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