1. 802.11 Standard: Comparison and Security Jason Gibson TCM471 Professor Crum

2. Introduction: History  Television Remote Control  Cordless Phones  Cellular Phones  Business Applications

3. IEEE Institute of Electrical and Electronics Engineers  Ensure Compatibility  Define Standards  Research New Technology  Wireless Standards  802.11  802.11b  802.11a  802.11g

4. IEEE 802.11  Developed in 1997  Supports High Data Rates - 1 to 2 Mbps  Operates at 2.4 GHz 2.4 GHz  Layer 1 -FHSS -DSSS  Layer 2 - CSMA/CA

5. IEEE 802.11b  Released in 1999  Support Higher Data Rates - 5.5 to 11 Mbps  Operates at 2.4 GHz  3 non- overlapping channels  Long Range Problem  Interference

6. IEEE 802.11a  Released September 1999  Support Higher Data Rates - 54 Mbps - 54 Mbps  Operates at 5 GHz  OFDM Problems  Limited Range  Interoperability

7. IEEE 802.11g  Scheduled Approval, May 2003  Support High Data Rates like 802.11a - 54 Mbps - 54 Mbps  Operates at 2.4 GHz like 802.11b  Backward Compatibility

8. Wireless Local Area Networks

9. Ad-hoc Mode - IBSS  Clients in same cell communicate directly  Other clients act as gateways within cell  Bluetooth

10. Infrastructure Mode - BSS  Centrally located access point  Management Frame Exchange  Association Process

11. Security Methods  Wired Equivalency Protocol (WEP)  Security Measures –Authentication –Confidentiality –Integrity  Vulnerabilities

12. Types of Attacks  Passive Attack –Eavesdropping –Traffic Analysis  Active Attack –Masquerading –Denial of Service

13. Security Solutions  Utilize Multiple Defensive Strategies  Virtual Private Networks (VPN’s)  Regular Password Updates  Changing Default SSID and Cryptographic Keys  Install Intrusion Detection system

14. QUESTIONS?