A switch never have a single mac-address assigned to two of its ports.
Let say Switch1 has learned PC-1 Mac on its Fa0/1 (Defaulty switch won't flush PC-1's mac from it's CAM table for 300'sec). In between these 300 sec's if i unplug the PC-1 from Fa0/1 and connect it to Fa0/2, the switch will assume that PC-1 is moved to Fa0/2 add then it will add PC-1 mac on its Fa0/2 and then flush it from its Fa0/1 port.
How about a multicast address? If a frame is destined to multlicast address (which is learned off more than one port depending if client has send igmp join message), will it then be forwarded to multiple ports?
Mostly multicast messages are sent by protocols (Eg: STP,VTP,DTP), those protocols will know which ports are participating in their operation. All the ports that are participating in that protocol funtion will get that frame.
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