WEP/ WPA?

Yes there is a difference, they are both secure enough that I wouldn't say either are dangerous, I believe WPA is just a little more secure. Also, if your the person that can't connect there ds to there router from earlier... Nintendo Ds do not support WPA, you have to leave it unprotected or use the less secure WEP. Though I'm pretty sure the Wii supports WPA, so I don't see why they couldn't make the DS support it with the next DS.
 
It was due to the cost. Making a DS WPA compatible would mean upping the price by around £10-£20
 
That seems like a likely reason but I would not sacrifice network security for price. WEP encryption is not very secure in fact, it can be cracked in a matter of minutes with some of the newer cracking tools. WPA on the other hand as mentioned earlier is more secure but it depends on which encryption algorithm is used. This is also known as WPA-PSK but is normally used with the AES algorithm which can be broken using a DOS attack from what I understand but unfortunately this is the default on most routers when WPA-PSK encryption is selected. The best thing to do is use the more secure TKIP algorithm which fixed the DOS attack issue but still it is a shame that the DS does not offer this as an option.
 
How far would a WEP signal travel?

Upstairs? Next door? Across thee strreet?
 
It depends on what router you are using, the range can be as little as 50 feet or as much as 300 feet. The encryption method does not determine the range of a Wifi signal. The factors that determine the range are the amount of power used to transmit the signal and the antennas used at both the router and the device or computer.
 
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