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#MAC ADDRESS FILTERING IS A FORM OF ACCESS CONTROL FOR WIRELESS AND WIRED LANS FREE#
#MAC ADDRESS FILTERING IS A FORM OF ACCESS CONTROL FOR WIRELESS AND WIRED LANS MAC#

If we refer to our Open Systems Interconnection (OSI) network model, we will find that MAC addresses in the medium access control protocol sub-layer uses data link layer.

#MAC ADDRESS FILTERING IS A FORM OF ACCESS CONTROL FOR WIRELESS AND WIRED LANS FREE#

This layer is also responsible for error free data transmission over the Physical layer under LAN transmissions.

Some devices that exist on this second layer are NIC cards, bridges and switches.

The left 24 bits (4 bytes) of the address is termed as Network Interface Controller Specific (NICS), which is responsible for communication either by using cables or wirelessly over a computer network. This globally unique OUI number will always remain the same for NICs manufactured by the same company. This OUI number is assigned by Internet Assigned Number Authority (IANA).

The right 24 bits (4 bytes) of the address is termed as Organizationally Unique Identifier (OUI) number.

The possible MAC addresses that can be formed by the address space is about 2^48 (over 281 trillion).

Four three-digits hexadecimals separated by dots (.) like ABCD.4567.1238.

Six two-digits hexadecimals separated by colons (:) like 45:67:89:AB:DE:23.

Six two-digits hexadecimals separated by hyphens (-) like 45-67-89-AB-12-CD.

According to the IEEE 802 standards, this address is written in three commonly used formats:

The total length MAC address in byte is 6 (or 48 bits).

This lets us identify each device within a connected network.

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