Bridges Continued
Bridges build tables so that they know which MAC addresses are on the local segments.
The bridge reads the destination MAC address of the packet and either forwards or discards the packet based on the information in the table.
Bridges reduce collisions by keeping excess traffic off of segments for which it is not intended.
Broadcast packets are forwarded by the bridge so bridges define collision domains but not broadcast domains.
Bridges function like repeaters in that they repeat signals but bridges selectively repeat a packet based on the MAC address.