* 1) add TCP header to data
2) add Ethernet header and trailer
3) add an IP header
4) encode the frame into bits
* 1) remove Ethernet header and trailer
2) remove IP header
3) remove TCP header
4) pass data to the application
* 1) remove IP header
2) remove Ethernet header and trailer
3) remove TCP header
4) pass data to the application
* 1) add TCP header to data
2) add an IP header
3) add frame header and trailer
4) encode the frame into bits
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