2. If it is active, it may be that the thread is loose.

3. The occurrence of active shutdown is unpredictable for the layer 2 equipment of the switch. Generally, there are several places to check: full duplex and half duplex, which are prone to this problem. Are there any special security restrictions on port security?

1, switch

According to the needs of information transmission at both ends of communication, the information to be transmitted is sent to the corresponding qualified route by manual or automatic equipment. Switches can be divided into WAN switches and lan switches according to their working positions.

2. Wide area switch is a device that completes information exchange function in communication system and is applied to data link layer. The switch has multiple ports, each of which has a bridging function, and can be connected to a local area network or a high-performance server or workstation. In fact, switches are sometimes called multiport bridges.