Addressing and Delivering
As you learned in Hour 3, “The Network Access Layer,” a computer communicates with the network through a network interface device such as a network adapter card. The network interface device has a unique physical address and is designed to receive data sent to that physical address. This unique physical address (which is often called the MAC address) is burned into the card when it is manufactured. A device such as an ethernet card does not know any of the details of the upper protocol layers. It does not know its IP address or whether an incoming frame is being sent to Telnet or FTP. It just listens to incoming frames, waits for a frame addressed to its own physical address, and passes that frame up the protocol stack. ...
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