1. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-1 Wireless LAN Introduction Olga Torstensson Halmstad University

2. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-2 Wireless LAN WLAN Bridging Access Point Bridge Antenna Wi-Fi ™

3. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-3 Major Factors There are four major factors to consider before implementing a wireless network: High availability Scalability Manageability Open architecture

4. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-4 Wireless Technologies PAN (Personal Area Network) PAN (Personal Area Network) LAN (Local Area Network) LAN (Local Area Network) WAN (Wide Area Network) WAN (Wide Area Network) MAN (Metropolitan Area Network) MAN (Metropolitan Area Network) PAN LAN MAN WAN Bluetooth Peer-to-Peer Device-to-Device Peer-to-Peer Device-to-Device Short <1 Mbps 802.11a, 11b, 11g HiperLAN2 802.11a, 11b, 11g HiperLAN2 Enterprise Networks Medium 2–54+ Mbps 802.11 MMDS, LMDS 802.11 MMDS, LMDS Fixed, Last Mile Access Fixed, Last Mile Access Medium–Long 22+ Mbps GSM, GPRS, CDMA, 2.5–3G GSM, GPRS, CDMA, 2.5–3G PDAs, Mobile Phones, Cellular Access PDAs, Mobile Phones, Cellular Access Long 10–384 Kbps Standards Speed Range Applications

5. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-5 Wireless Technologies

6. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-6 In Building WLAN

7. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-7 Site to Site WLAN

8. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-8 WLAN Markets

9. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-9 Radio Signal Interference

10. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-10 Power Consumption

11. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-11 Interoperability

12. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-12 Wireless LAN Security: Lessons “War Driving” Hacking into WEP Lessons: Security must be turned on (part of the installation process) Employees will install WLAN equipment on their own (compromises security of your entire network) WEP keys can be easily broken (businesses need better security)

13. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-13 Reliability and Connectivity

14. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-14 Installation and Site Design Issues— Bridging

15. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-15 Installation and Site Design Issues—WLAN

16. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-16 Health Issues

17. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-17 IEEE 802.11 Standards Activities 802.11a:5GHz, 54Mbps 802.11b:2.4GHz, 11Mbps 802.11d:Multiple regulatory domains 802.11e:Quality of Service (QoS) 802.11f:Inter-Access Point Protocol (IAPP) 802.11g:2.4GHz, 54Mbps 802.11h:Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) 802.11i:Security 802.11j:Japan 5GHz Channels (4.9-5.1 GHz) 802.11k:Measurement

18. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-18 WLAN Speeds & Frequencies 802.11g 2.4 GHz – OFDM/CCK 54 Mbps Proprietary  IEEE 802.11a/b Ratified 802.11a 5 GHz – OFDM 54 Mbps 802.11b 2.4 GHz – CCK 11 Mbps Jan’99 Jan’00Jan’01Jan’02Jan’03 Jan’04