Network professionals usually state that a network administrator should never assume his or her network is completely safe. That is a good and healthy attitude. You should always be aware of strange occurences in network traffic (peaks, most importantly). Inspecting your network logs may reveal suspicious traffic or logon attempts. However, with.
- WEP or preferrably WPA or AES encryption,
- MAC filtering,
- SSID broadcast disabled,
- and a strong router password
you can rest assured that the average cracker will hike a few minutes to the next wireless network that has lower defenses, especially since so many wireless networks are still not secured at all.