I found this while doing some leisure network reading and, again, because Im a visual learner, I thought this might be interesting for those interested.
When you send data from your computer, the information goes "down" the protocol stack from application to physical layers (7-1). The packet goes across the Cat5 and is received on the far end PC (or whatever). NIC gets it and is decapsulated "up" the protocol stack. Interesting stuff.
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