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Compare the size of the pipe and degree of network saturation.
Consider the cost of properly implementing security on wireless broadband, i.e. implementing a Public Key Infrastructure, training, overhead involved in the implementation of WEP, WPA, PEAP.
When your packets are out there in the air, they're easier to sniff out and hijack, leading to additional security costs to properly secure. Download AirSnort & Kismet to demonstrate security flaws in basic WEP implementation.
Also, consider the shared medium saturation rate of wireless compared to the switched 100 Mbps.
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BrainCase
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