What is the role of a switch what is the role of MAC address table?

The MAC address table is where the switch stores information about the other Ethernet interfaces to which it is connected on a network. The table enables the switch to send outgoing data (Ethernet frames) on the specific port required to reach its destination, instead of broadcasting the data on all ports (flooding).

A network switch connects devices (such as computers, printers, wireless access points) in a network to each other, and allows them to 'talk' by exchanging data packets. Switches can be hardware devices that manage physical networks, as well as software-based virtual devices.

At the center of the learning function is a part of the switch's memory. We refer to this memory location as the MAC Address Table. As the switch receives a data packet, it reads the source address and maps the port number to the MAC address in that source field.

A MAC Address is given by the manufacturer and it is embedded in the chip that allows your device to connect to a network. For a network switch, it is likely to have many MAC addresses, since one MAC address is assigned to every interface on the switch.