How does it work "without internet"?

Question

Computer networks

I don't even know what tags to ask this question.
Actually the very essence: a certain system works on a network not "not connected to the Internet." This is not the first time that the GAS elections , SWIFT 2.0 (the one that is banking, I did not find the link, but I remember the news for sure), and a few more interbank interactions have stated this for the first time.
I, as a techie, can not understand how it is "out of the Internet"? Maybe some kind of trend has lagged behind, or has another one been deployed on top of the current network infrastructure of the planet? Or if it does not open in the browser, then it is not on the Internet? Or is it just a "zilch", which does not tell the average IT that everything is cool and protected?
But if this is still the case, I would like to expand my horizons with a description of this technology, or links to its description.

Answer 1

The Internet is a network of networks, it uses any communication channels. Through the same communication channels, you can start up anything, but do not make it part of the Internet. For example, the Internet via a telephone line, a GSM/3/4/5G modem, a satellite channel, Wi-Fi, etc., all these communication channels can be used not for the Internet. The same VPN is not part of the Internet, in essence.
GAS Elections were generally partially (I won’t say how much) carried out by separate channels, though often a separate channel is conducted by an ordinary Internet provider, just instead of accessing the Internet, a VPN runs through it or routing is configured to the nearest "system node". And sometimes in parallel and the Internet in the same line :).
And indeed, in addition to the Internet, there are other networks that use the same, and sometimes other lines. OpCoSs in many places simply stretched their optics between nodes, where it turned out to be cheaper than renting other people's channels.
I exaggerated, of course, but the essence does not change

Answer 2

If very rough the Internet stands on HTTP + TCP/IP. There are many other protocols.

Answer 3

A small description of the structure of telephone communication in one sooooo large and thoroughly state-owned office (which I visited on business at that time at the beginning of the 2000s, so now, of course, everything is wrong there :) )
- Each city has its own branch
- Each branch has a satellite antenna
- with the help of these antennas, all branches are connected to the main office and local telephony goes through this network.
There is no Internet here :) A closed private network in which there can be at least any protocols :)

Answer 4

Rather, it is on top of the current infrastructure that the Internet lay down and uses it, but this does not mean that he owns the infrastructure exclusively. The Internet contributes to the development of networks, Internet protocols, due to their widespread use, are the most tested and stable and can be used in other networks - remove the gateway to the Internet from any local network of an enterprise - here is a private network built on Internet technologies (what in the 90s called the Intranet).
Have you ever rented a point-to-point channel from a telecom operator? Roughly, one can imagine the GAS elections as a set of point-to-point channels, united somewhere in the CEC.

Answer 5

I think that there are not many options (in order of confidence in their application):
1. Satellite network based on one of the current satellite infrastructures.
2. On the infrastructure of cellular networks, its own network was deployed with modems and SIM cards.
3. Access from unauthorized servers when exchanging data within the system is prohibited based on the "white" list of IP addresses and self-signed SSL certificates.

Answer 6

Read about AT&T . This is an example of a communications company incorporating the Internet into their networks as part of their business.

Answer 7

It's just that l2vpn, l3vpn are built with the help of ip / mpls, which go somewhere parallel to the Internet, using general physics, and somewhere according to their own physics.

Answer 8

For example, Russian Railways has its own, separate from the Internet, huge local network. In fact, an optical fiber hangs next to the tracks. And we have a railroad, damn it, for the whole vast country. Such hefty local networks are called intranets. Previously, when the Internet was expensive and slow, such networks covered individual apartment buildings. Then whole areas. This is to avoid going to computer clubs)