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Lect 05 computer networks 1 m 2012 dr
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Lect 05 computer networks 1 m 2012 dr

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  • 1. Learning Objectives1.  Define a network and its purpose.2.  Describe several uses for networks.3.  Understand the various characteristics of a network, such as topology, architectures, and size.4.  Understand characteristics about data and how it travels over a network. 3
  • 2. Overview  This chapter covers:   Common networking and communications applications   Networking concepts and terminology   Technical issues related to networks, including general characteristics of data transmission, 4
  • 3. What Is a Network? 5
  • 4. Networking Applications  The Internet  Telephone service   POTS network   Mobile phones (wireless phones)   Cellular (cell) phones - must be within range of cell tower to function   Satellite phones - used where cell service isn’t available   Dual-mode phones - allow users to make telephone calls on more than one network  Cellular / Wi-Fi dual-mode phones are most popular 6
  • 5. Mobile Phones 7
  • 6. Networking Applications 8
  • 7. GPS 9
  • 8. Networking Applications  Monitoring systems: Monitor status or location of individuals, vehicles, assets, etc.   RFID-based systems   Monitor the status of objects   GPS-based monitoring systems   Monitor the physical location of objects   Electronic medical monitors and other types of home health monitoring   Sensor networks   Devices that respond to heat, light, pressure and generate a measurable electrical signal 10
  • 9. Monitoring Systems 11
  • 10. Networking Applications 12
  • 11. Networking Applications
  • 12. Networking Applications 14
  • 13. Networking Applications
  • 14. Networking Applications 16
  • 15. Networking Applications
  • 16. Network Characteristics 19
  • 17. Network Topologies 20
  • 18. Network Topologies 21
  • 19. Network Topologies
  • 20. Network Architectures 23
  • 21. Network Architectures 24
  • 22. Network Architectures
  • 23. Network Size and Coverage Area 26
  • 24. Network Size and Coverage Area
  • 25. Network Size and Coverage Area 28
  • 26. Quick Quiz1. Which of the following describes a group of private secure paths set up using the Internet? a.VPN b. WAN c. WSN2. True or False: With a bus network, all devices are connected directly to each other without the use of a central hub or cable.3. A private network that is set up similar to the World Wide Web for use by employees of a specific organization is called a(n) _____________.Answers:1) a; 2) False; 3) intranet 29
  • 27. Data Transmission Characteristics 30
  • 28. Data Transmission Characteristics
  • 29. Data Transmission Characteristics
  • 30. Data Transmission Characteristics
  • 31. Data Transmission Characteristics 34
  • 32. Data Transmission Characteristics 35
  • 33. Type of Connections 36
  • 34. Summary  What Is a Network?  Networking Applications  Network Characteristics  Data Transmission Characteristics 37