Switches maintain a CAM Table that maps individual MAC addresses on the network to the physical ports on the switch. MAC flooding is a technique employed to compromise the security of network switches. Another convention used by networking equipment uses three groups of four hexadecimal digits separated by dots (.) (e.g. This form is also commonly used for EUI-64. The standard (IEEE 802) format for printing MAC-48 addresses in human-friendly form is six groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in transmission order (e.g. The IEEE claims trademarks on the names EUI-48 and EUI-64, in which EUI is an abbreviation for Extended Unique Identifier. MAC addresses are formed according to the rules of one of three numbering name spaces managed by the Institute of Electrical and Electronics Engineers (IEEE): MAC-48, EUI-48, and EUI-64. A network node may have multiple NICs and will then have one unique MAC address per NIC. It may also be known as an Ethernet hardware address (EHA), hardware address or physical address. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number and may be referred to as the burned-in address. MAC addresses are most often assigned by the manufacturer of a network interface card (NIC) and are stored in its hardware, the card's read-only memory, or some other firmware mechanism. Logically, MAC addresses are used in the Media Access Control protocol sub-layer of the OSI reference model. MAC addresses are used for numerous network technologies and most IEEE 802 network technologies, including Ethernet. AÂ Media Access Control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment.
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