Nederfox: (This is for you to study...)
Physical Numeric Address (MAC Address):
This consists of a 6-byte numeric address, burned into firmware (on a chip) by network interface manufacturers. The first three bytes (known as the organizational [u]unique identifier,[/b] or OUI identify the manufacturer of whatever interface is in use; the final three bytes provide another [u]unique[/b] numeric identifier that causes any interface on a network to have a [u]unique[/b] physical numeric address. The physical numeric address functions at a sublayer of the Data Link layer in the OSI network reference model, called the Media Access Control (MAC) layer. For that reason, it's also known as a MAC layer address (or MAC address). Although there's more to it than this explanation suggests, it is the job of the Logical Link Control (LLC) sublayer in the Data Link layer software (usually at the driver level) to enable the network interface to establish a point-to-point connection with another network interface on the same physical cable segment. ARP (Address Resolution Protocol) is used to permit computers to translate numeric IP addresses to MAC layer addresses, and RARP (Reverse ARP) is used to translate MAC layer addresses to numeric IP addresses.
"Guide to TCP/IP", Laura A. Chappell.
Course Technology 2002
ISBN: 0-619-18654-2
Pages 54 to 55
If you need more proof, go here...
http://www.webopedia.com/TERM/M/MAC_address.html
Now I'm not trying to be an ass about this by any means... I simply don't want anyone reading this thread to be misinformed.