Extended Learning Module E

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Extended Learning Module E

  1. 1. <ul><li>Extended Learning Module E </li></ul><ul><li>Network Basics </li></ul><ul><li>A great module on your CD. </li></ul>
  2. 2. Presentation Overview <ul><li>Peer-to-Peer Home Networks </li></ul><ul><li>Internet Access </li></ul><ul><li>Business Networks </li></ul><ul><li>LANs, MANs, WANs, and Communications Media </li></ul><ul><li>Communications Service Providers </li></ul>
  3. 3. Introduction <ul><li>Computer network - two or more computers connected so that they can communicate with each other and share information, software, peripheral devices, and/or processing power. </li></ul>
  4. 4. Introduction Basic Principles of Networks <ul><li>Each computer must have a network card. </li></ul><ul><li>A network has at least one connecting device. </li></ul><ul><li>There must be communications media connecting the network hardware devices. </li></ul><ul><li>Each computer must have software that supports the movement of information. </li></ul>
  5. 5. Peer-to-Peer Home Network <ul><li>Peer-to-peer network - a network in which a small number of computers share hardware, software and/or information. </li></ul>
  6. 6. Peer-to-Peer Home Network Home Network Components <ul><li>Network interface card (NIC) - an expansion card or a PC Card that connects your computer to a network and provides the doorway for information to flow in and out. </li></ul>
  7. 7. Peer-to-Peer Home Network Home Network Components <ul><li>Ethernet card - the most common type of network interface card. </li></ul>
  8. 8. Peer-to-Peer Home Network Home Network Components <ul><li>Network hub - a device that connects multiple computers. </li></ul><ul><li>Switch - a device that connects multiple computers into a network in which multiple communications links can be in operation simultaneously. </li></ul><ul><li>Router - a device that acts as a smart hub connecting computers into a network, and it also separates your network from any other network it’s connected to. </li></ul>
  9. 9. Peer-to-Peer Home Network Home Network Components <ul><li>Firewall - software and/or hardware that protects a computer or network from intruders. </li></ul><ul><li>Cat 5, or Category 5 cable - a better-constructed version of the phone twisted-pair cable. </li></ul>
  10. 10. Peer-to-Peer Home Network Wireless Access to Your Home Network <ul><li>Wireless network access point or wireless access point - a device that allows computers to access a wired network using radio waves. </li></ul><ul><li>WiFi, Wireless Fidelity, or IEEE 802.11b - a way of transmitting information in wave form that is reasonably fast and is often used for notebooks. </li></ul><ul><li>Bluetooth technology - provides entirely wireless connections for all kinds of communication devices. </li></ul>
  11. 11. Peer-to-Peer Home Network Home Network with Existing Phone Wiring <ul><li>Home PNA (Home Phone line Networking Alliance) - allows you to network your home computers using telephone wiring. </li></ul><ul><li>PNA adapter card - an expansion card that you put into your computer to act as an doorway for information flowing in and out. </li></ul>
  12. 12. Internet Access <ul><li>Ways to Access the Internet at Home </li></ul><ul><li>Telephone line and a telephone or dial-up modem. </li></ul><ul><li>Telephone line and a Digital Subscriber Line (DSL) modem. </li></ul><ul><li>Cable TV line and a cable modem. </li></ul><ul><li>Satellite dish and a satellite modem. </li></ul><ul><li>Provider that offers wireless connection for your notebook. </li></ul>
  13. 13. Internet Access Telephone or Dial-Up Connection <ul><li>Broadband - a high-capacity telecommunications pipeline. </li></ul><ul><li>Telephone modem - a device that connects your computer to your phone line so that you can access another computer or network. </li></ul><ul><li>Digital Subscriber Line (DSL) - a high-speed Internet connection using phone lines, which allows you to use your phone for voice communications at the same time. </li></ul>
  14. 14. Internet Access Cable Modem <ul><li>Cable modem - a device that uses your TV cable to deliver an Internet connection. </li></ul><ul><li>Satellite modem - a modem that allows you to get Internet access from a satellite dish. </li></ul>
  15. 15. Internet Access Wireless Internet Connection <ul><li>Wireless Internet service provider (wireless ISP) - does the same job as standard Internet service providers except that you don’t need a wired connection for access. </li></ul>
  16. 16. Internet Access Wireless Internet Connection <ul><li>Personal digital assistant (PDA) - a small hand-held computer that helps you surf the Web and perform simple tasks such as note taking, calendaring, appointment scheduling, and maintaining an address book. </li></ul><ul><ul><li>Palms and Handspring - run on the Palm Operating System </li></ul></ul><ul><ul><li>PocketPC s - run on Pocket PC OS </li></ul></ul>
  17. 17. Business Networks <ul><li>Client/server network - a network in which one or more computers are servers and provide services to the other computers which are called clients . </li></ul>
  18. 18. Business Networks Client/Server: A Business View <ul><li>Client/server networks differ according to three factors: </li></ul><ul><ul><li>Where the processing for the presentation of information occurs. </li></ul></ul><ul><ul><li>Where the processing of logic or business rules occurs. </li></ul></ul><ul><ul><li>Where the data management component (DBMS) and information (database) are located. </li></ul></ul>
  19. 19. Business Networks Client/Server: A Business View
  20. 20. Business Networks Client/Server: A Business View Team Work What Sort of Computer Network Does Your School Have? (p. 12)
  21. 21. Business Networks Client/Server: A Business View <ul><li>The Five Models of Client/Server </li></ul><ul><li>Distributed Presentation </li></ul><ul><ul><li>The server handles almost all functions, including a major portion of the presentation. </li></ul></ul><ul><li>Remote Presentation </li></ul><ul><ul><li>The client handles all presentation functions. </li></ul></ul><ul><li>Distributed Logic </li></ul><ul><ul><li>The server handles all data management and the client handles all presentation formatting, and the logic processing is shared. </li></ul></ul>
  22. 22. Business Networks Client/Server: A Business View <ul><li>Remote Data Management </li></ul><ul><ul><li>The server handles data management only, and the client processes business rules and formats the presentation of results. </li></ul></ul><ul><li>Distributed Data Management </li></ul><ul><ul><li>The client handles all presentation formatting and business rule processing, and both the server and client share data management duties. </li></ul></ul>
  23. 23. Business Networks Client/Server: A Business View On Your Own How Is a Server Different From a Client? (p. 18)
  24. 24. Business Networks Client/Server: A Physical View <ul><li>Communications protocol ( protocol ) - a set of rules that every computer follows to transfer information. </li></ul>
  25. 25. LANs, MANs, WANs, and Communications Media Classification of Networks by Geographic Distance <ul><li>Local area network (LAN) - covers a limited geographic distance, such as an office, building, or a group of buildings in close proximity to each other. </li></ul><ul><li>Municipal area network (MAN) - covers a metropolitan area. </li></ul><ul><li>Wide area network (WAN) – covers a large geographic distances, such as a state, a country, or even the entire world. </li></ul>
  26. 26. LANs, MANs, WANs, and Communications Media Telecommunications Media: The Paths That Carry Information <ul><li>Communications media - the paths, or physical channels, in a network over which information travels. </li></ul><ul><li>Wired communications media - transmit information over a closed, connected path. </li></ul><ul><li>Wireless communications media - transmit information through the air. </li></ul>
  27. 27. LANs, MANs, WANs, and Communications Media Telecommunications Media: The Paths That Carry Information <ul><li>Wired Communications Media include: </li></ul><ul><ul><li>Twisted-pair cable </li></ul></ul><ul><ul><li>Coaxial cable </li></ul></ul><ul><ul><li>Optical Fiber </li></ul></ul><ul><li>Wireless Communications Media Include: </li></ul><ul><ul><li>Microwave </li></ul></ul><ul><ul><li>Satellite </li></ul></ul><ul><ul><li>Infrared </li></ul></ul>
  28. 28. LANs, MANs, WANs, and Communications Media Bandwidth <ul><li>Bandwidth - refers to the amount of information that a communications medium can transfer in a given amount of time. </li></ul>
  29. 29. LANs, MANs, WANs, and Communications Media Wired Communications Media <ul><li>Twisted pair (phone cabling) provides a slow, fairly reliable path for information. </li></ul><ul><li>Coaxial cable (coax) - one central wire surrounded by insulation, a metallic shield, and a final case of insulating material. </li></ul><ul><li>Optical fiber - uses a very thin glass or plastic fiber through which pulses of light travel. </li></ul>
  30. 30. LANs, MANs, WANs, and Communications Media Wireless Communications Media <ul><li>Wireless communications media radiate information into the air. </li></ul><ul><li>Infrared - a wireless communications medium that uses radio waves to transmit signals or information. </li></ul><ul><li>Microwave transmission - a type of radio transmission. </li></ul><ul><ul><li>Bluetooth </li></ul></ul><ul><ul><li>WiFi </li></ul></ul>
  31. 31. LANs, MANs, WANs, and Communications Media Directional Microware for Medium Distances <ul><li>Repeater - a device that receives a radio signal, strengthens it and sends it on. </li></ul><ul><li>Communications satellites - microwave repeaters in space. </li></ul>
  32. 32. Communications Service Providers <ul><li>Communications service providers - third parties who furnish the conduit for information. </li></ul>
  33. 33. Communications Service Providers <ul><li>Public network - a network on which your organization competes for time with others. </li></ul><ul><li>Private network - communications media that your organization owns or exclusively leases to connect networks. </li></ul><ul><li>Value-added network (VAN) - a semipublic network that provides services beyond the movement of information. </li></ul><ul><li>Virtual private network (VPN) – uses software to establish a secure channel on the Internet for transmitting data. </li></ul>
  34. 34. Communications Service Providers Key Considerations for Communications Media <ul><li>To determine the most appropriate communications medium, you must consider: </li></ul><ul><ul><li>Capacity </li></ul></ul><ul><ul><li>Reliability </li></ul></ul><ul><ul><li>Cost </li></ul></ul><ul><ul><li>Distance </li></ul></ul><ul><ul><li>Mobility </li></ul></ul>Team Work What’s the Big Deal with Frequencies? (p. 23)
  35. 35. Summary Assignments & Exercises <ul><li>Investigate cell phone technology </li></ul><ul><li>Find out about Personal Digital Assistants </li></ul><ul><li>What are the Internet access options in your area? </li></ul><ul><li>Investigate building your own home network </li></ul><ul><li>Investigate satellite radio </li></ul>
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