Wi fi

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Wi fi

  1. 1. WIRELESS FIDELITY<br />Wi-Fi<br />NirajsinghChauhan<br />B.Tech CS<br />MAIIT<br />
  2. 2. CONTENTS<br />Wi-Fi Security<br />
  3. 3. INTRODUCTION<br />Wi-Fi is a WLAN<br />Uses radio frequency to transmit data through the air<br />Connect computers to each other to the internet and to the wired network<br />
  4. 4. THE WI-FI TECHNOLOGIES<br />Wi-Fi networks use radio technologies to transmit and receive data at high speed. <br />IEEE 802.11b<br />IEEE 802.11a<br />IEEE 802.11g<br /><ul><li>In 2001
  5. 5. Operates at 5 GHz
  6. 6. 15-20 Mbps (Actual speed)
  7. 7. 50-75 feet range
  8. 8. More expensive
  9. 9. Not compatible with 802.11b
  10. 10. In late 1999
  11. 11. Operates at 2.4GHz
  12. 12. 4-6 Mbps (Actual speed)
  13. 13. 100 -150 feet range
  14. 14. Most popular, Least Expensive
  15. 15. Interference from mobile phones and Bluetooth devices which can reduce the transmission speed
  16. 16. In 2003
  17. 17. Combine the feature of both standards (a,b)
  18. 18. 100-150 feet range
  19. 19. 54 Mbps Speed
  20. 20. 2.4 GHz radio frequencies
  21. 21. Compatible with ‘b’</li></li></ul><li>Elements of a WI-FI Network<br /><ul><li>Access Point (AP) - A wireless LAN transceiver or base station.
  22. 22. Wi-Fi cards – Accept the wireless signal and relay information. They can be internal and external.
  23. 23. Safeguards - Firewalls and anti-virus software protect networks.</li></li></ul><li>Wi-Fi Network Topologies<br /><ul><li>AP-based topology (Infrastructure Mode)
  24. 24. Peer-to-peer Technology (Adhoc mode)
  25. 25. Point-to-multipoint bridge topolgy</li></li></ul><li>AP-based topology<br /><ul><li>Communicate through AP.
  26. 26. BSA-RF coverage provided by an AP.
  27. 27. ESA-It consists of 2 or more BSA.
  28. 28. ESA cell includes 10-15% overlap to allow roaming.</li></li></ul><li>Peer-to-peer topology<br /><ul><li>AP is not required.
  29. 29. Client devices within a cell can communicate directly with each other.
  30. 30. It is useful for setting up of a wireless network quickly and easily.</li></li></ul><li>Point-to-multipoint bridge topology<br /><ul><li> Use Line -of-Sight (LoS)strategy.
  31. 31. Used to connect a LAN between buildings which are miles apart.</li></li></ul><li>How a Wi-Fi Network Works<br /><ul><li>Basic concept is same as Walkie talkies.
  32. 32. A Wi-Fi hotspot is created by installing an access point to an internet connection.
  33. 33. Wi-Fi enabled device encounters a hotspot, the device can then connect to that network wirelessly.
  34. 34. Each AP can support up to 30 users within a range of 100 – 150 ft indoors and 300 ft outdoors.</li></li></ul><li>Wi-Fi security<br /><ul><li> Data Integrity
  35. 35. Encryption
  36. 36. Authentication</li></li></ul><li>Future of Wi-Fi security<br /> The future of Wi-Fi security will be very bright if we overcome the security problems in the present technologies. And if we protect Wi-Fi from these security problems we have long way to produce great technologies under Wi-Fi networking in future.<br />
  37. 37. Wi-Fi Security Problems<br /><ul><li> Modulation Spectrum Technique
  38. 38. Change Default Passwords
  39. 39. Wired Equivalent Privacy (WEP)
  40. 40. Crackers
  41. 41. Service Set Identifier (SSID)</li></li></ul><li>Wi-Fi Applications<br /><ul><li>Home
  42. 42. Small Businesses or SOHO
  43. 43. Large Corporations & Campuses
  44. 44. Health Care
  45. 45. Wireless ISP (WISP)
  46. 46. Travellers</li></li></ul><li>Advantages<br /><ul><li>Mobility
  47. 47. Ease of Installation
  48. 48. Flexibility
  49. 49. Cost
  50. 50. Reliability
  51. 51. Security
  52. 52. Roaming
  53. 53. Speed</li></li></ul><li>Limitations<br /><ul><li>Interference
  54. 54. Degradation in performance
  55. 55. High power consumption
  56. 56. Limited range</li></li></ul><li>CONCLUSION<br />Wireless Fidelity is common now. We are expecting more on this technology in future. Let’s hope for that ….<br />
  57. 57. >>Any Queries<<<br />

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