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Think of DoS attacks that come from within a network [smurf, for example] that will cause the netwrok to crumble in a matter of minutes [even seconds, maybe]
I doubt that will happen that fast. It is possible though, to eventually crumble the network...but not that fast. With the resource available today, ISPs have plenty of more juice to pass around. Also, if they detect (Which they probably will) a HUMONGUOUS amount of packets going back and forth....they will kill the connection. I'm sure simple DDOS attacks these days go unseen by many ISPs...but with the possibility of having to machines go at each other's throat, they will most likely implement a packet monitor and measure the ammount of packets going from one place to the other. If they reach a particular number, Kill the switch.