If it later receives another frame with A as the destination address
(perhaps from station B), also from trunk 1, it knows not to relay that frame to trunk 2.
The bridge knows that A will also receive it, because it has learned that station A is on
trunk 1. If the bridge receives a frame addressed to station A on trunk 2 (or on trunk 3
or trunk 4) however, it knows to relay that frame to trunk 1, where it has learned that
A resides. The bridge stores this information about stations??™ addresses and trunks in
its filtering database.
What if someone disconnects station A from trunk 1 and connects it to trunk 2 instead?
If A transmits any frame on trunk 2, the bridge learns its new LAN association
1 The term switch has, in recent years, come to be almost synonymous with the term bridge. Historically, the
difference has not been a technical one: ???Your company makes those old-fashioned bridges; my company
makes those cool new switches!??? The term switch was first applied to bridges in the mid-1990s when the
ability to snoop on, and even act on, Layer 3 IP information was added to bridges. Terminology inflation
has since ensured that even the most basic standard bridges are marketed as ???switches.
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