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Wi fi

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Wi fi

  1. 1. CONT E NT S• INTRODUCTION• TECHNICAL ASPECTS• EQUIPMENTS• WI-FI STANDARDS• ELEMENTS OF WI-FI NETWORKS• NETWORK TOPOLOGIES• SECURITY• AUTHENTICATION• APPLICATION• ADVANTAGES• LIMITATION
  2. 2. What is Wi-Fi ??
  3. 3. Connecting to WiFi
  4. 4. Technical Aspects Overview
  5. 5. Equipment For Wi-FiTypically Wi-Fi requires 3 main pieces tobe in place:
  6. 6. Wi-Fi Standards 802.11 802.11 802.11 802.11 n 2.4 a5 b 2.40 g 2.40 or GHz GHz GHz 5GHz band band band band
  7. 7. Wi-Fi Standards Cont.802.11a :
  8. 8. Wi-Fi Standards Cont. 802.11 b:
  9. 9. Wi-Fi Standards Cont. 802.11 g:
  10. 10. Wi-Fi Standards Cont.802.11 n:
  11. 11. Elements of a WI-FI Network
  12. 12. How a Wi-Fi Network Works
  13. 13. Wi-Fi Network Topologies123
  14. 14. AP-based topology .
  15. 15. Peer-to-peer topology
  16. 16. Point-to-multipoint bridge topology
  17. 17. Wi-Fi Security The requirements for Wi-Fi network security can be broken down into two primary components: Authentication  User Authentication  Server Authentication Privacy
  18. 18. Authentication Keeping unauthorized users off the network User Authentication  Authentication Server is used  Username and password  Risk: Data (username & password) send before secure channel established Prone to passive eavesdropping by attacker  Solution Establishing a encrypted channel before sending username and password
  19. 19. Wi-Fi Applications
  20. 20. Advantages Mobility Ease of Installation Flexibility Cost Reliability Security Use unlicensed part of the radio spectrum Roaming Speed
  21. 21. InterferenceDegradation in performanceHigh power consumptionLimited range

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