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WLAN 802.11

802.11 WECA 2 4 Agilent Wi-Fi 802.11b: Wi-Fi 802.11a: Wi-Fi 5 802.11g:? DSSS ( ) 802.11b : ( ): 130 feet @ 11Mbps ( ): 16 miles @ 11Mbps

WAN GPRS, 1xRTT (2.5G) UMTS (3G) Mobitex, ReFLEX LAN HomeRF HiperLAN 2 PAN Blackberry 2.4 GHz, 802.11b 5 GHz, 802.11a, AFH

WLAN 802.11

Agere 11% (Q4) $451M WLAN Cisco 18% Others 35% D-Link 5% Buffalo 10% Avaya 4% Linksys 11% Symbol 6% WLAN Cisco Symbol 14% 37% Other 31% Agere 18% : Synergy Q401 (Q4) $142M

WLAN : 14 WLAN : :

WLAN WLAN

802.11 : ISP ( WISP ) Wayport MobileStar:,, VoiceStream T-Mobile Boingo MobileStar 15 2.99 49.99/ / / 7.95 / 10 24.95 GRIC/iPass

WLAN 802.11

WLAN Alphabet Soup : IEEE 802.11 802.11a: 802.11b: 802.11d: 802.11e: 802.11f: 802.11g: 802.11h: 802.11i: 5GHz, 54Mbps 2.4GHz, 11Mbps (QoS) (IAPP) 2.4GHz, 54Mbps (DFS) (TPC)

WLAN 802.11g 2.4 GHz OFDM/CCK 54 Mbps 802.11a 5 GHz OFDM 54 Mbps IEEE 802.11a/b 802.11b 2.4 GHz CCK 11 Mbps 1999 2000 2001 2002 2003

5GHz 5GHz 5.15 5.25 5.35 5.470 5.725 5.825 UNII 4 Ch 4 Ch 11 Ch 4 Ch US (FCC) 12 UNII-1 (* 40mW 6dBi ) UNII-2 250mW UNII-3 1W 19 200mW * ) 1W UNII-1:, UNII-2: / UNII-3:

802.11 5 GHz 802.11a 2.4 GHz 802.11b g 54 Mbps 11Mbps 54Mbps 802.11g 3 8 ( 802.11b ) 802.11g ( )!

WLAN 802.11

Aironet 350/340 802.1X: LEAP, EAP-TLS WEP TKIP 100 mw PC 2002 5 21 20 WLAN AP

BR350/340 T1 (fast ROI) WAN ( ) 11 11 Mbps 16+

AP1200! (802.11b + 802.11a) 5GHz Combo 802.11b 2002 8 9 802.11a

Wireless LAN Wireless LAN CiscoWorks WLSE Aironet WLAN 500 AP/ RADIUS

AP Cisco Aironet Cisco Aironet 340/350 (.11b) Cisco Aironet.11g AP 1200 11a AP.11b.11a PC ( ) 2001 2002 2003

802.11 IBM Dell 802.11b Mini-PCI Tecra Portege Cisco 802.11b Mini-PCI Thinkpad WLAN Thinkpad T30; Thinkpad Dell Latitude Cisco 802.11b Mini-PCI 2003, 50% 802.11!

802.11 PDA PocketPC 802.11 Compact Flash 802.11 PDA Palm OS Palm 802.11 sled Handspring Springboard 2003: 802.11 SD 802.11 PDA PDA

802.11 802.11b : SpectraLink Symbol + 802.11 IT & PBX

802.11 Tablet PC

WLAN PC PCI SD Mini-PCI USB Compact Flash 1 Combo 802.11 + GPRS 802.11 + 1xRTT 802.11 + + PDA + + 802.11 + 3G

WLAN 802.11

LAN Credit: KNTV San Jose

: 802.11i (TKIP) (IV) (MIC)

WLAN 802.1x, TKIP, 40-128-,, WEP (VPN),

WLAN : MAC 802.1X LEAP 802.1X EAP-TLS 802.1X PEAP (3Q 02) 802.1X SIM (2002 3 ) : 40-128- WEP WEP TKIP AES ( 2003 ) - Jerry Bruestle ( WEP AirSnort ) @stake WLAN Aironet 350 LEAP TKIP - @stake ( ) : : 2002/2003

802.1X/LEAP AP RADIUS AP RADIUS RADIUS ( ) AP

: LEAP 802.1x, OS WinXP, 2K, ME, NT, 98, 95, CE, Mac, Linux, DOS LEAP PEAP ( OTP ) SIM 802.1x, Cisco, Microsoft, RSA PEAP Radius, VPN ( OTP ) Softoken OTP 2002 3 OTP PEAP WinXP Win2K ; Windows OS (NT, ME, 98, CE) GSM 802.11 802.1x

: 40-128- WEP WiFi 2001 3 WEP WEP TKIP AES LEAP ( 15 ) WEP ; 802.11i 2001 12 ; 802.11 TKIP ; 2003 802.11i AES VPN

WLAN 802.11

Aironet : WLAN IEEE / IP

802.11

Windows OTP PEAP GSM-SIM 802.1X GSM SIM EAP-TLS GSM SIM OTP ( ) 802.1x: EAP- TLS SIM

WLAN WLSE ( LAN ) WLAN CiscoWorks Wavelink AP Avalanche

WLAN 802.11

...

NOP LAN 100 300 : 1¾ : 70 : +22% Source: NOP World-Technology, Sept. 2001

WLAN : Microsoft Aironet 40,000 30

? 5 3 4 / x 5 / = 15-20 / PowerPoint 15 20 / PC

WLAN + + + + WLAN +. $300 ( 1 ) + $150 ( 2 ) 0.50 1 + +... + + +. 6 12 / / 0.50-1 = 1-2 / /

: WLAN 802.11 WLAN AP:

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