In networking process, we can assume with city and country. People in a country can move to another city freely, without any important notice document. Cities in a country also have the same rule/policy, so every peoples know about it. Then people movement in a country just need a switch, that always has been knew what inter city peoples identities and behaves.
And when a people want to go to another country, many conditions should be fulfilled like passport, visa, driving license, etc. They also will setup the clock on their watch. All those process need a router.
...to be continued...
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