Definition of MAC Address in Network Encyclopedia.
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What is MAC Address?
MAC Address is a unique 6-byte (48-bit) address that is usually permanently burned into a network interface card (NIC) or other physical-layer networking device and that uniquely identifies the device on an Ethernet-based network.A MAC address is also known as an Ethernet address, hardware address, physical address, or PHY address.How MAC address Works
MAC addresses can be hard-coded into circuitry or stored in read-only memory (ROM), and they can be configured using vendor-supplied software. The uniqueness of MAC addresses is ensured by the Institute of Electrical and Electronics Engineers (IEEE), which assigns networking device vendors specific blocks of MAC addresses for the devices they produce. The first 3 bytes (24 bits) represent the manufacturer of the card, and the last 3 bytes (24 bits) identify the particular card from that manufacturer. Each group of 3 bytes can be represented by 6 hexadecimal digits, forming a 12-digit hexadecimal number representing the entire MAC address. Examples of manufacturer 6-digit numbers include the following:00000C (Cisco)00001D (Cabletron)0004AC (IBM
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Changing the address is not a good idea! If you accidentally configure two network cards on your network to have the same MAC address, address conflict problems will result and the computers will not be able to communicate on the network. However, some NICs, such as Token Ring cards, actually require you to assign a unique MAC address to them before they will work.How to find MAC AddressTo determine the MAC address of your computer’s NIC, use the following commands:From the latest Microsoft Windows OS command prompt: ipconfig /allFrom the Windows 95 or Windows 98 Run dialog box: winipcfg
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