What are the 3 main functions of a switch?

The three main functions of the switch are: learning, forwarding filtering, and loop elimination. Learning, the switch learns the MAC address of the device connected to the port, and maps the address to the corresponding port and stores it in the address table; forwarding filtering, when the destination address of a data frame is mapped in the MAC address table, it will be forwarded The port to connect to the destination node.

The three main functions of the switch are: learning forwarding, filtering and eliminating loops

Three main functions :

(1) Learning: The Ethernet switch learns the MAC address of the device connected to each port, maps the address to the corresponding port, and stores it in the MAC address table in the switch cache;

(2) Forwarding/filtering: When the destination address of a data frame is mapped in the MAC address table, it is forwarded to the port connected to the destination node instead of all ports (if the data frame is broadcast/multicast The frame is forwarded to all ports);

(3) Eliminate loops: When the switch includes a redundant loop, the Ethernet switch uses the spanning tree protocol to avoid the occurrence of loops and allows the existence of backup paths.

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