toko TMW1003, User Manual

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Wireless LAN Security
• interference of other devices,
• number of users.
Some devices can handle more than one data rate; see the
specifications of your device.
B.5.3 Regulatory Domain
Every region or country has a regulatory body which governs the use of
radio channels. Such a region is called a regulatory domain.
Europe (excluding France) is governed by the ETSI (the European
Telecommunications Standards Institute). In the United States of
America, the FCC (Federal Communications Commission) fulfils this
role.
The radio channels (see section B.5.4: ‘Radio Channels’ on page 53 )
you can use depend on your regulatory domain.
A wireless LAN uses a spectrum of radio frequencies for which no end-
user license is needed.
B.5.4 Radio Channels
Each Access Point in the network forms the center of a cell, i.e. an area
in which the radio signal of an Access Point is sufficient to join the
network.
The radio channels that you are allowed to use depend on both the
capabilities of the PC cards you are deploying, as well as the regulations
in your area (see section
B.5.3: ‘Regulatory Domain’ on page 53 ).
For a single Access Point you can choose any of the available channels.
However, when there are more Access Points in the neighborhood, they
must send and receive preferably on different channels for a maximum
throughput. The cells should overlap slightly to guarantee seamless
wireless connectivity everywhere.
B.6 Security
Wired LANs require security techniques to prevent unauthorized access
to and management of the network.
Security on a Wireless LAN requires additional techniques to protect
from eavesdroppers that want to listen in on the Wireless LAN traffic.
Every node (Access Point, PC card) in a wireless network must be
secured against eavesdropping.
To get a secure network, two techniques are used: