Hi - my neighbour in the next flat has emailed to say that her computer was accessed twice whilst she was out. I have my firewall enabled and my wifi needs the correct registration key so I'm fairly sure that my computer is safe, but can anyone advise how her computer could have been accessed? She hasn't said what sites were accessed. Thanks.
Sticking the terms WEP and WPA into Google will tell you all that you need; specifically why WEP is not a good option anymore. For an added level of protection, most routers allow you to specify the MAC address(s) of computers that are allowed to connect to it. The MAC (Media Access Control) number is unique to a network card/wireless network card. click here
What is probably more important in this instance is to find out from your neighbour what level of protection she had and what she means when she says her PC was accessed!
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