Routing is another can of worms. Basically, every router
on the Internet knows 2 things about life: How to reach
IP addresses on its own network, and who to ask when
it wants to reach something on another network.
There’s more to it, like routers telling each
other about the shortest or fastest ways to get from
point A to B, and they can have multiple interfaces
and “load balance” traffic between them,
but we won’t get into that.
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