Sooo, dial up is slow. Very slow. But the data being transmitted over the physical cable is still using TCP/IP protocols to communicate with the broaderinternet.
Look up something called the OSI model.
The routers and switches downstream from you don’t care about the nature of your connection-fiber, copper, wireless, dial up, it’s all the same. Converted into frames which contain packets which contains bytes which contain bits, which are made up of 1s and 0s.
So from a security perspective? The line can be tapped, but that’s true of Ethernet and fiber as well. What’s amazing about information technology is that it’s built around protocols that exist independent of the physical equipment involved.
Ahhh okay okay, maybe I misunderstood. I was under the impression that it could only send messages between devices on the same LAN.