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Cisco: Understanding how Mac and IPs are used to travel the network

Last Modified: 2014-08-07
I've see a lot of videos on the Internet about packet travel through a network, but I'm looking for a clear detail understanding of how data travels on a network from a Cisco point of view, this info needs to include how the mac-address, IP address are used and what happens to the data (mac and IP address) as it travels through the local area network and also out to the Internet?

Thank you,
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Great answer!, now I would like to know what is in packet, I guess how it it framed and how that packet is used through the switching and routing process, if you want I'll ask this in another question. The answer you gave, answers my question, but I have a question to follow.
It'd be better to ask it in a separate question.  This will help everybody, including those who are trying to find solutions to similar problems they're experiencing.

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