Forwarding Known Unicast Frames
To decide whether to forward a frame, a switch uses a dynamically built table that lists MAC
addresses and outgoing interfaces. Switches compare the frame’s destination MAC address to
this table to decide whether the switch should forward a frame or simply ignore it. For exam-
ple, consider the simple network shown in Figure 5-3, with Fred sending a frame to Barney.
In this figure, Fred sends a frame with destination address 0200.2222.2222 (Barney’s MAC
address). The switch compares the destination MAC address (0200.2222.2222) to the MAC
address table, matching the bold table entry. That matched table entry tells the switch to for-
ward the frame out port F0/2, and only port F0/2.
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