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2

By using disassocate packets. Those packets has the source MAC of an AP and force the client to disconnect and reconnect to the AP. By keeping sending those packets, you can keep any client away and unable to connect to this specific access point. Edit: A summery for people can't access links. From a tool named Aircrack-ng Deauthentication ...


2

We do not know how Facebook implements security internally, so we can only guess. But common best-practices regarding admin authentication is to use the IP address as an additional authentication factor, but not the only one. For example, it would not be uncommon to only allow admins to connect from specific IP addresses which were authorized for this, but ...


5

We don't know what security measures Facebook exactly provides but spoofing the source IP of a TCP connection (which is used when accessing a web site) and still doing something useful with the connection is impossible in practice. This means that it is more likely that the site was really accessed from the shown IP address (no spoofing), that the database ...



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