1. 1999 Cabletron Systems

2. Wireless Networking RoamAbout Security, FCC Regulations, and Safety 802.11 inherent security Wired Equivalent Privacy (WEP) FCC guidelines

3. 1999 Cabletron Systems Wireless Networking RoamAbout Network Name and Association In this scenario, the only station in this cell that will be able to associate with the AccessPoint is station B AccessPoint Station A Network Name: sales Station B Network Name: admin

4. 1999 Cabletron Systems Wireless Networking RoamAbout Authentication Stations must first authenticate with an AccessPoint before they can associate with it IEEE 802.11 defines: –Open System Authentication –Shared Key Authentication (based on Wired Equivalent Privacy (WEP))

5. 1999 Cabletron Systems Wireless Networking RoamAbout Open System Authentication In open system mode, station A makes an open system Authentication request to the associated AccessPoint Authentication request (Open System Authentication) Station A AccessPoint

6. 1999 Cabletron Systems Wireless Networking RoamAbout AccessPoint responds and authentication is complete –Note: This mode of operation, although secure for the most part, is not as secure as operating with Wired Equivalent Privacy (WEP) installed Open System Authentication Authentication response (Open System Authentication) Station A AccessPoint

7. 1999 Cabletron Systems Wireless Networking RoamAbout Encryption RoamAbout offers encryption to meet security concerns –Base 40 bit encryption –Optional 128 bit encryption –Encryption based on RC4 (1988 RSA algorithm) –Used by Netscape, Microsoft, Oracle and Lotus (80 million users) –The encryption is used in a shared key format which is used to: Encrypt a challenge text string by the end station and To decrypt the challenge text string response by the AccessPoint

8. 1999 Cabletron Systems Wireless Networking RoamAbout Station makes a shared key authentication request Shared Key Authentication (WEP) Authentication Request Station A AccessPoint

9. 1999 Cabletron Systems Wireless Networking RoamAbout Shared Key Authentication (WEP) AccessPoint replies with a “challenge” text string AccessPoint Challenge Text String Station A

10. 1999 Cabletron Systems Wireless Networking RoamAbout Shared Key Authentication (WEP) The station encrypts the challenge text string with the shared key and responds to the AccessPoint with the Encrypted challenge text string Encrypted challenge text response Station A AccessPoint

11. 1999 Cabletron Systems Wireless Networking RoamAbout The AccessPoint decrypts the encrypted challenge text and makes a decision to authenticate the station based on the results –Positive results in association –negative results in no association Shared Key Authentication (WEP) Positive or Negative response Station A AccessPoint

12. 1999 Cabletron Systems Wireless Networking RoamAbout FCC Regulations Licensing –The requirements are such that as long as the manufacturer adheres to the regulations, a site license is NOT required by the end user Power requirements –USA 1 Watt from any omni-directional radio antenna 4 watts from any amplified antennas –Europe 100mWats from any source

13. 1999 Cabletron Systems Wireless Networking RoamAbout FCC Channel Distribution 1 2412 24012423 2 2417 24062428 3 2422 24112433 4 2427 24162438 5 2432 24212443 6 2437 24262448 7 2442 24312453 8 2447 24362458 9 2452 24412463 10 2457 24462468 11 2462 24512473 2400 MHz 2484 MHz ISM Band Channel number Top of channel Center frequency Bottom of channel

14. 1999 Cabletron Systems Wireless Networking RoamAbout ETSI (Europe) Channel Distribution 1 2412 24012423 2 2417 24062428 3 2422 24112433 4 2427 24162438 5 2432 24212443 6 2437 24262448 7 2442 24312453 8 2447 24362458 9 2452 24412463 10 2457 24462468 11 2462 24512473 2400 MHz 2484 MHz ISM Band 12 2467 24562478 13 2472 24612483 Channel number Top of channel Center frequency Bottom of channel

15. 1999 Cabletron Systems Wireless Networking RoamAbout Channel Distribution Worldwide Channel IDETSIFCCFranceJapan 12412 -- 22417 -- 32422 -- 42427 -- 52432 -- 62437 -- 72442 -- 82447 -- 92452 -- 102457 - 122467- - 132472- - 14---2484 112462 - Cabletron AccessPoint Default channels