Big idea
When data goes from one computer to another on a different network, it does not keep the same frame the whole way.
It keeps the IP packet, but each network it crosses gives that packet a new frame for the next part of the trip.
Analogy: a person taking several buses
Imagine you want to travel from one town to another.
You are the IP packet
Each bus is like a frame
The bus station worker is like a router
You stay the same person during the whole journey.
But you do not stay on the