Even though they have many advantages, wireless networks also have limitations and
disadvantages. For example, because 802.11b and 802.11g devices use the 2.4 GHz
band, these devices can pick up interference from appliances such as microwave ovens
and cordless telephones that use the same band. More important, wireless networks
pose major security concerns because wireless transmissions are much more susceptible
to interception and intrusion than wired networks. These issues are discussed in detail in
Chapter 12, Managing Systems Support and Security.
In addition to Wi-Fi, another form of wireless transmission called Bluetooth is very
popular for short-distance wireless communication that does not require high power.
Examples of Bluetooth devices include wireless keyboards, mice, printers, cell phone
headsets, and digital cameras, among others. People with Bluetooth-equipped phones or
PDAs can even beam information to each other and exchange digital notes.
Although the expansion of Wi-Fi has been dramatic, future technology promises even
greater wireless speed, range, and compatibility. For example, in addition to 802.11 protocols
for LANs, IEEE is working on 802.16 standards, which are broadband wireless
communications protocols for MANs (metropolitan area networks). These specifications,
which IEEE calls WiMAX, are expected to enable wireless multimedia applications
with a range of up to 30 miles.