When the Destination host responds it becomes the source of the new packet and it's MAC address is recorded, Since the switch knows what port the destination address is on it only forwards to that port
The Switch (PRT) Table
|
E8-08-88-CB-3F-B4 |
00-1B-63-B4-45-C6 |
||
|
1 |
3 |
Layer 2
E8-08-88-CB-3F-B4
1
44-AB-5F-DF-C1-FB
2
00-1B-63-B4-45-C6
3
0F-99-3E-A6-2F-01
4