You cannot take down the internet. This is because of every single link radiating and meshing outwards to and from the sources. The internet [meaning interconnection of computers] will still be there, but the users may not be able to reach their searched content if one applies all the theories outlined above successfully. That said, in-order to bring down the internet in the literal meaning of the word, *without* the terminal/servers/PC endpoints, *then* there would be no internet. Obviously trying to destroy the redundant links would be impossible in the sense that, given their location [space, underground, submarine, mountains etc] and the time-frame and resources required,, the links would be restored even as you move to destroy another area. On the other hand, if you hunt down the computers that form this internet... the same impossible feat would be revealed because once again, whether it be physical destruction *or* viruses and worms,, the users can still replace or restore as fast as you destroy them. So the philosophical question is : HOW DO YOU BRING DOWN THE INTERNET ALL AT ONCE ?? Answer :- Destroy all the connected terminal computers at once ! HOW DO YOU DESTROY ALL THE CONNECTED COMPUTERS AT ONCE ??? Now this is where we are all limited in technology except in the realm of science fiction. On the top of my head : 1) Make a huge Electro-Magnetic Pulse bomb whose effects would reach 6400km radius and ..... 2) ..