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Communication Security: Wireless • Chapter 4 215
Additional information about an individual AP or client can be
found by selecting its MAC address either under the Channels or the
SSIDs menu in NetStumbler, as shown in Figure 4.17.
Figure 4.17 Additional Information from NetStumbler
This information shows the strength of the device’s signal. The black
lines in the field indicate when the signal was lost. The closer the green
area gets to zero, the stronger the signal. By using NetStumbler, an
attacker can determine where an AP or a client is located, as well as
what characteristics have been enabled on the wireless network. This
same tool can be used by network administrators for site surveys of
their networks.
Finding Weaknesses in a Target
Reports show that more than half of the wireless networks found to date do not
have encryption enabled.When an attacker finds such a network they have com-
plete access to any resources the wireless network is connected to.The attacker can
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