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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 13: Basic Networking Terminology
      9  OSI Reference Model and Networking Protocols and Technologies
           9  Layer 2 - Data Link Layer

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NIC
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MAC Addressing

The MAC address is the layer 2 address that helps each computer identifies itself in a network. This address is built by the manufacturer and is installed in a microcircuit of the NIC. Each address is unique. The given address consists of 48 bits and is expressed in hexadecimal. IEEE (Institute of Electrical and Electronic Engineers) allocates the first 3 bytes for the manufacturer; then the manufacturer specifies the last three. This system ensures that a MAC address is unique. MAC addresses have one major disadvantage; they are unstructured and are considered flat address spaces182


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182. http://standards.ieee.org/faqs/OUI.html

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