Disadvantages include those associated with the introduction of any new technology: impact on existing network architecture, stability and maturity of new hardware and software, and higher per-unit cost. On this last point, consider that cheap Wi-Fi cards and APs are still more expensive than cheap 10/100 Ethernet NICs and hubs, and enterprise-grade products are more expensive than SOHO products. One disadvantage unique to wireless is increased risk of eavesdropping and unauthorized use. The Wired Equivalent Privacy (WEP) included in 802.11 was an attempt to bring WLANs up to the same security level as today's Ethernet LANs, but WEP did not meet this goal. New IEEE standards like 802.1X port access control and TKIP will do a better job of providing wireless link security.
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