What interface is link/act?

Link/act is the physical data interface; the link/act indicator on the switch indicates whether the line is connected or active; usually the Link/ACT indicator is used to observe whether the line is activated or unobstructed; under normal circumstances, If the line is open, the indicator light will stay on; if there is data transmission, the indicator light will flash.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

What is the interface of link/act?

Physical data interface.

The link/act indicator on the switch indicates whether the line is connected or active. Usually the Link/ACT indicator light is used to observe whether the line is activated or unobstructed. Under normal circumstances, if the line is open, the indicator light will be on. If there is data transmission, the indicator light flashes.

Related expansion:

Switch principle:

1. The switch works on the second layer of the OSI reference model, that is, the data link layer. The CPU inside the switch will form a MAC table by matching the MAC address to the port when each port is successfully connected.

2. In future communications, data packets sent to this MAC address will only be sent to its corresponding port, not all ports. Therefore, the switch can be used to divide the data link layer broadcast, that is, the collision domain; but it cannot divide the network layer broadcast, that is, the broadcast domain.

3. The switch has a very high bandwidth back bus and internal switching matrix.

4. All ports of the switch are connected to this back bus. After the control circuit receives the data packet, the processing port will search the address comparison table in the memory to determine the destination MAC (hardware address of the network card )'s NIC (network card) is attached to which port.

5. Quickly transmit the data packet to the destination port through the internal switching matrix. If the destination MAC does not exist, broadcast it to all ports. After receiving the port response, the switch will "learn" the new MAC address and send it Added to the internal MAC address table.

6. Using a switch can also "segment" the network. By comparing the IP address table, the switch only allows necessary network traffic to pass through the switch. Through filtering and forwarding of switches, collision domains can be effectively reduced, but it cannot divide network layer broadcasts, that is, broadcast domains.

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