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WEP pervents casual access and sniffing. It provides some basic encryption, but can be cracked by sniffing about a gig of traffic. Refurbished stuff is usaly fine.....
802.11b throughput without WEP is 5mbps, with can be as low as 1.5mbps. 802.11g offers throughput of about 20 mbps in g-only mode, and about 10mbps (to g clients) in b compatibility mode. Many 802.11a products offer turbo modes that are quite fast, but the range is a bit less.
Make sure you secure your wireless, unless you don't mind you neihbors finding out what websitesd you visit. EVEN WITH encryption, your traffic can easily be intercepted, and I do not know if that has changed with G.
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