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based on a 64(40)-bit shared key algorithm. 
 
6.  What is a MAC Address? 
The Media Access Control (MAC) address is a unique number assigned 
by the manufacturer to any Ethernet networking device, such as a 
network adapter, that allows the network to identify it at the hardware 
level. For all practical purposes, this number is usually permanent. 
Unlike IP addresses which can change every time a computer logs on to 
the network, the MAC address of a device stays the same, making it a 
valuable identifier for the network.