Wow, now thats expensive just to get them to password protect their systems, with a half decent Username and Password.

Gary Mckinnon , now in the process of being extradited to the US (regarded as one of the worst Cyber security spies ever by US authorities), all he did was write a simple PERL script which interrogated .mil websites for logins that still had 'Admin' and 'Password' or NULL etc as the network login details. If folks are going to leave their front door open with a big sign saying come on in and trash the place, well you can only blame those administering those networks. Network security is only as good as the security procedures employed by those running and using those networks.

Here is a list of default Usernames and Passwords

http://www.phenoelit-us.org/dpl/dpl.html

If you really wanted to take down any 'secured' distributed geographical network then a concerted attack using Irish workmen armed with pick axes and diggers would probably be more effective than any Sino-Soviet conspiracy.