Sort of. There are two probable ways it would happen. The first, and most likely, is that the government could order all ISPs to stop the flow of data through t

Sort of. There are two probable ways it would happen. The first, and most likely, is that the government could order all ISPs to stop the flow of data through their pipes. Theoretically, they could also shut down some of the root nameservers (http://en.wikipedia.org/wiki/Root_nameserver http://en.wikipedia.org/wiki/Root_nameserver), many of which are owned by the government. But again, this wouldn't truly shut down the Internet, it'd just stop browsers from being able to turn addresses into IP addresses. If you knew the IP of the site you were trying to visit, they couldn't stop you with that method. Edit: also note that since DNS resolution is a redundant system, they'd have to shut down EVERY root nameserver (or at least the ones in the US) to stop resolution completely. Otherwise it'd basically just slow down, though potentially to the point where it'd become unusable.