2. CONT E NT S
• INTRODUCTION
• TECHNICAL ASPECTS
• EQUIPMENTS
• WI-FI STANDARDS
• ELEMENTS OF WI-FI NETWORKS
• NETWORK TOPOLOGIES
• SECURITY
• AUTHENTICATION
• APPLICATION
• ADVANTAGES
• LIMITATION

3. What is Wi-Fi ??
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4. Connecting to WiFi
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5. Technical Aspects Overview
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6. Equipment For Wi-Fi
Typically Wi-Fi requires 3 main pieces to
be in place:
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7. 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

8. Wi-Fi Standards Cont.
802.11a :
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9. Wi-Fi Standards Cont.
802.11 b:
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10. Wi-Fi Standards Cont.
802.11 g:
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11. Wi-Fi Standards Cont.
802.11 n:
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12. Elements of a WI-FI Network
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13. How a Wi-Fi Network Works
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14. Wi-Fi Network Topologies
1
2
3

15. AP-based topology
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16. Peer-to-peer topology
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17. Point-to-multipoint bridge topology

18. Wi-Fi Security
 The requirements for Wi-Fi network security
can be broken down into two primary
components:
 Authentication
 User Authentication
 Server Authentication
 Privacy

19. 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

20. Wi-Fi Applications
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21. Advantages
 Mobility
 Ease of Installation
 Flexibility
 Cost
 Reliability
 Security
 Use unlicensed part of the radio spectrum
 Roaming
 Speed

22. Interference
Degradation in performance
High power consumption
Limited range