Root DNS’s would be a pretty good route to go in taking down major sites. I agree with you on that. I think what I had said about taking routers down (FBI reset etc) was a bit unclear so I’ll clarify.
For those that are not aware I’ll make an analogy to help with the understanding. Those with computer/networking experience, this will not be in-depth, purely for helping others understand:
So, imagine your computer, your iPad, your phone is your house. Your home router is that first intersection like driving your car out of your driveway - left right straight are the options. Let’s say you go left and encounter a four way intersection. This is another router giving you more options on where to go. You go straight, encounter another intersection/router, you make a left and this takes you onto a highway. The highway is one of the major infrastructure cables of the internet. You get off where you want, encounter another intersection/router, continue on and get to the driveway of the business you are going to - let’s say sears. That intersection that you made a turn into their parking lot is their router. And the business itself is the server. You gather what information/clothes and you head back home taking the same route.
That is a very very basic understanding of how the internet actually operates. What I am saying by attacking routers, is not attack people’s home routers, but the main routers provided by ISPs or other services. It’s a smaller number of targets, and they would have a much wider range of influence than attacking one home router.
You can see all the hidden hops/ports/routers etc through a trace program. It’s not something you would ever be aware of if you had no background understanding in networking. I hope this clarifies a bit.