3. Since the destination address isn’t in the MAC database, the frame is forwarded out all
interfaces except the source port.
4. Host B receives the frame and responds to Host A. The switch receives this frame on
interface Fa0/1 and places the source hardware address in the MAC database.
5. Host A and Host B can now make a point-to-point connection and only these specific
devices will receive the frames. Hosts C and D won’t see the frames, nor will their MAC
addresses be found in the database because they haven’t sent a frame to the switch yet.
If Host A and Host B don’t communicate to the switch again within a certain time
period, the switch will flush their entries from the database to keep it as current as possible.