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Wireless LAN
PC Card
Wireless LAN
Router/AP
File server
Wireless LAN
Router/AP
Wireless LAN
USB Adapter
Wireless LAN
USB Adapter
Wireless LAN
PC Card
Wireless LAN
PC Card
Wireless LAN
PC Card
Wireless LAN
PC Card
Wireless LAN
USB Adapter
Wireless LAN
Router/AP
56K/ISDN TA/
Cable/Xdsl Modem
Firewall
Internet
Wireless LAN
PC Card
Figure 1-4
Access points have a finite range, on the order of 50 meters indoor and 100 meters outdoors. In a
very large facility such as an enterprise, a warehouse, or on a college campus, it will probably be
necessary to install more than one access point to cover an entire building or campus, as shown in
Figure 1-5
. In this scenario, access points hand the client off from one to another in a way that is
invisible to the client. Ensuring Token connectivity, wireless clients can roam seamlessly between
different coverage areas and remain connected to the network.
Figure 1-5
Wireless Router and IP Sharing
In infrastructure mode, in addition to acting as a bridge between an Ethernet and wireless network,
the AP can be configured as a wireless router and IP sharing device for Internet access as shown in
Figure 1-6
. You don’t have to buy an expensive router. Nor do you have to buy several modems
and setup phone lines. Just share one AP, one modem, a single dial-up account, and one phone
line, dozens of network users can go surfing the Internet concurrently.