Your remark about Bloomberg being the largest private network is interesting. By what measure it is the largest (#people, #machines, miles of links?) and which ones count as private?
Maybe it's mostly using satellite connections?
Seems like there'd be many times (particularly in the US) where tunneling an encrypted connection over a civilian ISP would be worlds better than the next best option. Maybe not even at the IP level, but a dedicated wavelength on some existing AT&T fibre, for example.
> Provide DISN-provided transport and information services used for > data, voice, video, and cross domain through a combination of terrestrial, > aerial, satellite assets, and services IAW DODD 5105.19 (reference c). > Transport services include information transfer services between CC/S/A > installations, facilities, and enclaves, for connections to external mission > partner and defense contractor ISs and networks, and wide area network > information transfer.
http://web.archive.org/web/20120914011329/http://www.dtic.mi...
It is actually an incredibly interesting topic, but it is hard to get much information on the specifics online (I assume many details are classified or at least SBU).
I could buy largest private financial network, but it's hard to verify a claim like this when the Chinese network behind the great firewall could be considered a private network (measuring by the intent rather than the implementation).