The Forward Versus Filter Decision

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 example, consider the simple network shown in Figure 6-16, with Fred sending a frame to Barney.

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Figure 6-16 Sample Switch Forwarding and Filtering Decision

In this figure, Fred sends a frame with destination address 0200.2222.2222 (Barney’s ...

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