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Ethernet Addressing (MAC)

PreviousLAN Data-Link Layer ProtocolsNextTypes of Networking Devices

Last updated 4 years ago

  • Address is also called MAC Address (Media Access Control).

  • MAC Address is 6 Bytes, 48 bits Hexadecimal Address.

  • This MAC Address is made up of 6 Sets & each Set includes 8 bits of Hexadecimal characters separated by periods.

  • MAC Address is pre-programmed in every NIC card.

  • IEEE Assigns the first 3 Bytes unique to the NIC card called the Organizationally Unique Identifier (OUI). And the manufacturer assigns the remaining 3 Bytes unique to every NIC card that they manufacture.

  • In this way, No two NIC cards will have the same MAC Address. Hence MAC Address is also called a Unicast Ethernet Address, LAN address, Ethernet address, hardware address, burned-in address, physical address & universal address.

    6 Bytes (48 Bits) MAC Address:

    OUI

    Vendor

    24bits

    24bits

    00 60 2F

    3A 07 BC

    (6 Hex digits)

    (6 Hex digits)

Group Address:

Apart from the Unicast Ethernet Address, Ethernet also uses Group Addresses which are divided into two categories:

  • Broadcast Address:

    • Frame sent to this address will be delivered to all the devices of that LAN. It is FF:FF:FF:FF:FF:FF

  • Multicast Address:

    • Frame sent to this address will be copied & delivered to a group belonging to that specific Multicast address & not to all the devices.

    Reference:

    CCNA 200-301 OCG, Volume 1, Pg. 50-51 - Wendell Odom.

Ethernet