In article , jonnah wrote: :what is the difference between public and a private data network? am I :correct in assuming that if you use a *public* data network to connect :your remote offices with your branch offices, you either use the :Internet as the Public DN or frame relay (as the Public DN of a telco) :but if you use leased lines or pt to pt links, then is it considered :as a *private* data network? (since you're not sharing the links with :others) if anybody knows, please enlighten me
Pretty much. If a random person around the world can get packets to your security gate then you are on a public data network. If only a closed list of places can get to your security gate, and you can't get out either then you are on a private data network.
In between would be semi-private networks that have clouds of accessible devices and security gateways to public networks. For example, a research network might allow public email in and might allow insiders a wide variety of outward accesses, but the basic security controls might be far away from most of the member systems.
To really be considered a private network in the traditional PSTN sense, there can't be -any- cross-border traffic possible through the network facilities.