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Where can you learn more about this stuff?

For example, I've always been curious how Swift is routed at the lowest layer. Does it go through the normal internet? The telecommunications infrastructure? Custom fiber-optic cables connecting almost every bank in the world to some kind of central office?

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It's just VPN and MPLS connecting banks with SWIFT.

Rumor is, they still keep ISDN gateways operational as well ;-)

I believe that SWIFT is now a private IP based network. That means it runs on dedicated comm channels, but uses the internet's IP.

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