2.6. Getting an A+
This chapter goes over some common wireless communications. The following points are covered:
Infrared technology depends on line-of-sight and tends to be used for low-bandwidth solutions.
A number of factors affect wireless signal quality and strength, such as interference, range, and the number of connected clients.
802.11a/b/g networks all have a range of 100 feet (30 meters), and 802.11n has a range of 165 feet (50 meters). 802.11a networks operate in the 5 GHz spectrum, and 802.11b and 802.11g networks operate in the 2.4 GHz spectrum; while 802.11n networks can operate in both spectrums.
WEP and WPA are the most common methods to secure wireless networks, but other options include disabling SSID broadcasting, MAC filtering, placing wireless APs in a DMZ, and changing default passwords.
Bluetooth is used only for short-range communication.
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