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Address Resolution Protocol (ARP)
http://www.dictionary-attack.com/ ?p=47
IP addresses of 32 bits (or the upcoming 128-bit IPv6 standard) are logical addresses only. This means that the network adapter itself has no preconceived notion of what its IP address is, but rather is assigned an address by a hardware mechanism. This is an important distinction, since it would be difficult to replace a failed network adapter, or to change the IP address of an existing adapter, unless the hardware address were decoupled from the logical address. Ethernet hardware addresses (called MAC addresses), by way of example, are 48 bits in length and are theoretically unique throughout the world.
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