Week9 networking (

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Week9 networking (

  1. 1. Networking
  2. 2. Understanding Computer NetworksO A computer network is a collection of computers, printers, and other devices that are interconnected by communication channels. Computer networks facilitate communications among users and allow users to share resources.
  3. 3. Advantages of Networks O Sharing Resources, O Security, O Communication, O Education, O Project Management .
  4. 4. Drawbacks of Networks O Installation and maintenance cost O Viruses and trojan horses O Network can be useless in the case of a crashing server O Identity theft O Internet crimes
  5. 5. Network TypesO LAN (local area network)O MAN (metropolitan area network)O WAN (wide area network)
  6. 6. LAN (Local Area Network)Usually, if the devices on a network are in asingle location, such as a building or agroup of rooms, they are called a local areanetwork (LAN). LANs usually have all thedevices on the network connected by asingle type of network cable or wirelessconnection.
  7. 7. MAN (Metropolitan Area Network)A metropolitan area network (MAN)interconnects users with computerresources in a geographic area orregion larger than that covered by alocal area network (LAN) but smallerthan the area covered by a wide areanetwork (WAN).
  8. 8. MAN (Metropolitan Area Network)
  9. 9. WAN (Wide Area Network) O If the devices are scattered widely, such as in different buildings or different cities, they are usually set up into several LANs that are joined together into a larger structure called a wide area network (WAN).
  10. 10. WAN (Wide Area Network)
  11. 11. Comparing LAN, MAN and WAN
  12. 12. NetworkComponents
  13. 13. MediaO The term network media refers to the pathways along which data travel. Network media is the actual path over which an electrical signal travels as it moves from one component to another. It provides connections between the network computers, peripherals, and devices in the network.O There are four types of media technologies used in computer networks:
  14. 14. Coaxial cable
  15. 15. UTP (unshielded twisted pair)
  16. 16. Fiber Optic Cable
  17. 17. Wireless
  18. 18. Network DevicesO Computer networking devices are units that mediate data in a computer network. Computer networking devices are also called network equipment or communication devices.
  19. 19. NIC (network interface card)
  20. 20. BridgeO A bridge device filters data traffic at a network boundary. Bridges reduce the amount of traffic on a LAN by dividing it into two segments.
  21. 21. SwitchO A network switch is a small hardware device that joins multiple computers together within one local area network (LAN).
  22. 22. RouterO When two or more networks must be connected, a router is usually necessary.

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