Switch is normally a layer 2 device. It populates its Mac table with mac entries of the devices to which it is connected by Broadcast at first, then multicast and finally with unicast. Switches are used to provide seperate collision domain in the network.
Routers and layer 3 switches are in the category of layer 3 devices.
Nomally layer 3 devices are all those devices to which ip address can be allocated, which includes computer as well.
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