A MAC address is a fixed number that is 'burned' into each NIC
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if by co you mean computer then yes you go to command prompt and type in "ipconfig/all" and you go to "network interface(or whatever it calls your nic)" and it will show u the physical address of your nic
Network Interface Card(NIC) is used to connect a PC to the the network. It is fixed into one of the computer's expansion slot. In wireless network also NIC is used.It can be identified by a light.
Modem.
it's the MAC address
there is the time it takes the source NICto place voltage pulses on the wire and the time it takes the receiving NIC to interpret these pulses. This is sometimes called NIC delay