The filter-versus-forward decision works
best when the switch knows where all the MAC addresses are in the
network. Switches dynamically learn the MAC address in the network to
build its MAC address table. With a full, accurate MAC address tables,
the switch can make accurate forwarding and filtering decisions.
Switches build the MAC address table by
listening to incoming frames and examining the frame’s source MAC
address. If a frame enters the switch, and the source MAC address is not
in the address table, the switch creates an entry in the table. The MAC
address is placed in the table, along with the interface in which the
frame arrived. Switch learning logic is that simple!
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