Heres a little trick thats very effective on taking down the WHOLE School Network. Found it out on my School Network.
Works only on Ethernet connection networks. Find two PCs next to each other plugged into the Ethernet wall socket, Take the ethernet cable out of one pc and plug it into the other so there is two cables plugged into the same pc. This confuses the hell out of the network and Shuts it down. This took down ALL the computers around the school and ALL the security cameras. It cant be fixed until they find the pc with 2 plugs in and take them out and reboot the network.
When i did it i shat myself as i did it infront of the cctv, but then it disconnected that too as it was a webcam cctv rather than regular so it dced xD
I just tried this at my school, their was like 50+ doing their homework in the IT room and they all were like screaming :L - Feel kind of bad as some of them people were friends, but LOL that was funny.
I would try this in my school but most of the computers we have the backs of them where everything is plugged in is block up :( but there is some olds computers that are not it's just getting to them :P