802.11 Network Structures
zuallererst sollten wir mal die struktur festlegen (is jetz die ausm skript), sprich sachen rausstreichen, dann den ganzen kram befüllen ...--Cb 20:52, 11 July 2006 (CEST)
Traditional 802.11
- 802.11 =
- „wireless ethernet“
- Wi-fi (from Wi-Fi Alliance, wireless fidelity)
IEEE 802.11 as part of IEEE 802
- IEEE 802.11x =
- IEEE = Institute of Electronics and Electrical Engineers
- 802 = project group (Entwicklung von LAN-Standards)
- 11 = working group (Entwicklung eines wireless-LAN Standards)
- x = task groups
- erstmalige Spezifikation 1997, Änderungen 802.11-1999, 802.11-2003
- the 802.11 Task Groups:
| 802.11 | First standard (1997). Specified the MAC and the original slower frequency-hopping and direct-sequence modulation techniques. |
| Cell 1, row 2 | Cell 2, row 2 |
Structure of a wireless network
Types of Networks
Independent BSS (IBSS, Ad-Hoc networks)
Infrastructure BSS
ESS
Distribution system
Using the MAC
CSMA/CA
DCF, PCF, NAV
MAC-Zugriffsmodi: Coordination Functions
Timing beim Zugriff auf das MAC: NAV
Interframe Spacing (nur erwähnen)
Network operations and services
Network services overview
Frame format
Frame Arten
Frame Fragmentation
allg. Format
Management
Scanning a Network: Probes and Beacons
Passive Scanning Active Scanning Beacon Frame Probe Request Frame Probe Response Frame Scan Report
Joining a network
1.4.3.2.1 802.11 Authentication 21 1.4.3.2.2 Preauthentication 22 1.4.3.2.3 Association Procedure 22 1.4.3.2.4 Association Request Frame 22 1.4.3.2.5 Association Response Frame 23 1.4.3.2.6 Mobility support: Transitions 23 1.4.3.2.7 Reassociation procedure 24 1.4.3.2.8 Reassociation Request Frame 25 1.4.3.2.9 Association and authentication states 25
Vertraulichkeit und Zugangskontrolle
WEP
802.11i
Controlling the MAC
Control Frames
RTS/CTS
ACK
PS-Poll
Moving data
Prinzipien
1.4.6.1.1 Broadcast Data, Multicast Data und Management Frames 29 1.4.6.1.2 Unicast Data (Management und Daten) 30 1.4.6.1.3 PowerSave Sequenzen 31
Data frames
Distribution
Integration/Encapsulation of ethernet frames
1.4.6.4.1 Prinzip 33 1.4.6.4.2 Ablauf des Bridging zwischen 802.11 und Ethernet 34 wireless2wired 35 wired2wireless 35