ANUBIS Typhoon Wireless Access Point Manual do Utilizador descarregar pdf (Página 3)

Inhaltsverzeichnis

1 EINLEITUNG......................................................................................................... 6

2 GRUNDLAGEN DER WLAN-TECHNOLOGIE ..................................................... 8

2.1 Der Begriff WLAN nach IEEE 802.11.....................................................................................................8

2.2 Vor- und Nachteile von WLANs...............................................................................................................8

2.3 Der Standard IEEE 802.11 .......................................................................................................................9

2.4 802.11 Systemarchitektur (Topologie) ................................................................................................... 11

2.4.1 Ad-hoc Modus ......................................................................................................................................11

2.4.2 Infrastrukturmodus................................................................................................................................ 13

2.4.3 Roaming................................................................................................................................................ 15

2.5 Die Bitübertragungsschicht ....................................................................................................................15

2.5.1 DSSS-WLANs...................................................................................................................................... 16

2.5.2 FHSS-WLANs...................................................................................................................................... 18

2.5.3 OFDM-WLANs....................................................................................................................................19

2.5.4 Infrarot-WLANs ...................................................................................................................................20

2.5.5 WLAN Packet Format ..........................................................................................................................21

2.5.6 Automatische Regelung der Übertragungsrate .....................................................................................22

2.6 Die MAC-Schicht nach IEEE 802.11 .....................................................................................................23

2.6.1 Einfaches CSMA/CA............................................................................................................................ 24

2.6.2 CSMA/CA mit RTS/CTS......................................................................................................................26

2.6.3 Point Coordination Function (PCF) ......................................................................................................27

2.6.4 MAC-Rahmenstruktur ..........................................................................................................................28

2.6.5 Scannen.................................................................................................................................................29

2.6.6 Authentifizierung..................................................................................................................................29

2.6.7 Anmeldung (Assoziierung)...................................................................................................................30

2.7 Sicherheit..................................................................................................................................................30

2.7.1 Sicherheitsprobleme..............................................................................................................................30

2.7.2 Schutzmaßnahmen für WLAN nach IEEE 802.11................................................................................ 31

2.8 802.11 Netzwerkkomponenten und Hardware......................................................................................33

2.8.1 Wireless Network Interface Card..........................................................................................................34

2.8.2 Access Points, Router und Brücken......................................................................................................35

2.8.3 WLAN-Antennen..................................................................................................................................36

3 HARDWARE-MARKTRECHERCHE – DER ACCESS POINT ........................... 39

3.1 Der InfoPunkt ..........................................................................................................................................39

3.2 Technische Voraussetzungen für den Access Point ..............................................................................40

3.3 Access Points auf dem Markt .................................................................................................................40

3.4 Fazit ..........................................................................................................................................................49

1 2 3 4 5 6 7 8 ... 123 124

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