The question that is not revealed clearly from the movies (or maybe I missed it). Is Skynet a single supercomputer or a distributed net of computers, that just coordinate their actions, but do not subordinate to each other?
The first one seems more appropriate for military command, but the second variant is much harder to destroy, since the elimination of one node will not interrupt the action of the others. So, any guesses, which one is used by Skynet?