the source Layer 2 address of incoming frames is recorded by a switch to build its MAC address table.
The switch's MAC address table maintains information about the other Ethernet ports to which it is linked on a network. Instead of broadcasting the data over all ports, the table allows the switch to deliver outgoing data (Ethernet frames) on the exact port necessary to reach its destination (flooding). Enter the show mac-address command to view the MAC table. The Type column in the output of the show mac-address command specifies whether the MAC entry is static or dynamic. The static-mac-address command is used to establish a static entry.
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