wi fi
TRANSCRIPT
C O N T E N T S
• INTRODUCTION• TECHNICAL ASPECTS• EQUIPMENTS• WI-FI STANDARDS• ELEMENTS OF WI-FI NETWORKS• NETWORK TOPOLOGIES• SECURITY• AUTHENTICATION• APPLICATION• ADVANTAGES• LIMITATION
What is Wi-Fi ??
Connecting to WiFi
Technical Aspects Overview
Equipment For Wi-Fi
Typically Wi-Fi requires 3 main pieces to
be in place:
Wi-Fi Standards
802.11a 5 GHz band
802.11b 2.40 GHz band
802.11g 2.40 GHz band
802.11n 2.4
or 5GHz band
Wi-Fi Standards Cont.
802.11a :
Wi-Fi Standards Cont.
802.11 b:
Wi-Fi Standards Cont.
802.11 g:
Wi-Fi Standards Cont.
802.11 n:
Elements of a WI-FI Network
How a Wi-Fi Network Works
Wi-Fi Network Topologies
1
2
3
AP-based topology
.
Peer-to-peer topology
Point-to-multipoint bridge topology
Wi-Fi Security
The requirements for Wi-Fi network securitycan be broken down into two primarycomponents:
Authentication
User Authentication
Server Authentication
Privacy
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
Wi-Fi Applications
Advantages
Mobility
Ease of Installation
Flexibility
Cost
Reliability
Security
Use unlicensed part of the radio spectrum
Roaming
Speed
Interference
Degradation in performance
High power consumption
Limited range