What is the MAC address?

　What's the MAC address?

Mac (Medium/mediaaccess control, media access controls) MAC addresses are burned in Networkinterfacecard (NIC). The MAC address, also known as the hardware address, is made up of 48-bit/bit (6-byte/byte,1byte=8bits) and 16-digit digits. 0-23 BITS is called the organization Unique identifier (organizationally unique, is the identification LAN (LAN) The identity of the node. The 24-47-bit is assigned by the manufacturer itself. The 40th digit is the multicast address flag bit. The physical address of the NIC is usually the eprom of the network card manufacturer that burns into the NIC (a flash memory chip, which can usually be erased by the program), which stores the address of the computer and the host that receives the data when transmitting the data.

In other words, at the bottom of the network physical transmission process, is through the physical address to identify the host, it is generally the only global. For example, the famous Ethernet card, its physical address is 48bit (bit bit) of integers, such as: 44-45-53-54-00-00, in a machine-readable way into the host interface. Ethernet address management (except in the case of this) (IEEE) (IEEE: Institute of Electrical and Electronic engineers) will be the Ethernet address, that is, 48 bits of different combinations, divided into several separate consecutive address groups, the production of Ethernet network card manufacturers to buy one of the groups, the specific production, Assign a unique address to an Ethernet card individually

　　Talk about the basic knowledge of network card and the working principle of network card.

Figuratively speaking, the MAC address is like the ID card number on our ID card, which has global uniqueness. The network card MAC address is very widespread in the net application, because of its uniqueness, therefore it is easy to know the corresponding computer through the MAC address in the network, convenient user identifies the host. In the wireless security settings, we can bind the specified computer network card MAC address, so as to achieve the designated computer networks, filtering out the illegal intervention users, greatly improve network security.