What is the physical address of the computer?

The physical address of the computer refers to the MAC address of the computer, which is used to uniquely identify the network card in the network. If a device has one or more network cards, each network card needs and will have a unique MAC address.

MAC address, literally translated as media access control address, also known as LAN address, Ethernet address or physical address, is used to confirm the location of online devices. In the OSI model, the third network layer is responsible for IP address and the second data link layer is responsible for MAC address.

You can connect another router by importing your own router MAC address into the landlord router MAC list, and then connecting the LAN ports of the two routers with network cables.

Extended data:

IP address and MAC address are similar in that they are both unique, and the differences are as follows:

For devices on the network, such as computers or routers, their IP addresses are designed according to the network topology. On the same device or computer, it is easy to change the IP address (but it must be unique), while the MAC is burned by the manufacturer and generally cannot be changed.

We can assign any IP address to the host as needed. For example, we can assign an IP address to a computer on the LAN as192.168.0.12, or change it to 192. 168.0.200.

However, once any network device (such as network card and router) is generated, its MAC address cannot be modified by the configuration in the local connection. If the network card of the computer is broken, the MAC address of the computer will change after the network card is replaced.

Different lengths. The IP address is 32 bits and the MAC address is 48 bits. The distribution basis is different. The allocation of IP addresses is based on network topology, and the allocation of MAC addresses is based on vendors.

The addressing protocol layers are different. IP address is applied to the third layer of OSI, that is, the network layer, while MAC address is applied to the second layer of OSI, that is, the data link layer.

The data link layer protocol enables data to be transmitted from one node to another (via MAC address) on the same link, while the network layer protocol enables data to be transmitted from one network to another (ARP finds the MAC address of the intermediate node according to the destination IP address, transmits it through the intermediate node, and finally reaches the destination network).

Reference Baidu Encyclopedia -—MAC Address