Check it out
Good video from the standpoint of routing but it doesn’t talk about the DNS system and how the packet gets the IP address for the url the user types in the computer in the first place.
See http://www.howstuffworks.com/dns.htm for a detailed description. This is equally amazing for how little time it takes.
Another good video (older but still relevent) about packets and routing is “Warriors of the Web” at https://www.youtube.com/watch?v=Pdqss2GvU5M
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