There is an old (on the Internet) saying; the web interprets censorship as damage and simply routes round. This is a key point as the internet was designed to route around the damages caused by a nuclear strike - so routing around censorship is child's play. While the technical routing around damage/censorship is one thing, how people respond is not dissimilar;

Defining what a network is, is a huge topic.  It is one I engage with to some extent in my research and you can boil a network down to two components - links and nodes.  The beginnings and ends of the network is a more complex matter.  For example with the Internet, it is less one big network and more a series of networks united by common protocols.  (There is a good discussion of mapping networks using Actor-Network Theory in chapter 4 of Murdoch's book Post-Structuralist Geography.  But networks ar