Now it is time to look inside bridges and find out what makes them tick.
The main function of a bridge is to forward any frame whose source and destination are on different sides of the bridge.
If the frame's destination is reached through the frame's arrival port, the bridge discards the frame.
If the frame's destination is not reached through the arrival port, the bridge forwards the frame.
How does a bridge know where a station with a particular MAC address is located? The method, which is called learning, is straightforward:
The bridge watches all the traffic at each of its ports.
The bridge notes the source MAC address of each frame and the port at which the frame was observed.
The bridge adds ...