Meaning Of Mac address

Meaning Of Mac address
Here is the Mac address of Understanding
MAC Address (Media Access Control Address) is
a network address which is implemented on the data-link layer in the OSI seven layer model, which represents a particular node in the network.
yes confused explanation?
points is the mac address is the physical address of the computer on the network.

In an Ethernet-based network, the MAC address is a unique address which has a length of 48-bit (6 bytes) which identifies a computer, the interface in a router, or other nodes in the network.
MAC Address is also called the Ethernet address, physical address or hardware address. MAC Address allows the devices in the network to communicate between each other. For example, in a network based on Ethernet technology, every header in the Ethernet frame contains information about the MAC address of the computer source (source) and the MAC address of the destination computer (destination).
Some devices, such as bridges and Layer-2 switch will see the MAC address of the computer information source of each frame it receives and uses this MAC address information to create a "routing table" internal dynamic.
Those devices were then uses the newly created table to forward frames that it receives into a port or a specific network segment where the computer or node that has a destination MAC address is located.
In a computer, MAC address assigned to a network card (network interface card / NIC) that is used to connect computers to the network concerned. MAC Address can not be changed because it generally has been inserted into the ROM.
Some network cards provide a utility that allows users to change MAC address, although this is less advisable. If a network has two network cards that have the same MAC address, there will be conflict and address of the computer can not communicate between each other.
Some network cards, such as Token Ring card requires the user to set the MAC address (not included in the ROM), before it can be used.
MAC addresses must be unique indeed, and for this purpose, the Institute of Electrical and Electronics Engineers (IEEE) has allocated blocks in MAC addresses. The first 24 bits of the MAC address of the card-makers who represent, and the remaining 24 bits represent the number of the card. Each group of 24 bits can be represented by using six-digit hexadecimal numbers, making the total 12-digit hexadecimal numbers that represent the entire MAC address.

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