Tale 1: A switching table

Port Number	Source MAC Address
12	IA-1A-IA-IA-IA-IA
14	2B-2B-2B-2B-2B-2B
16	3C-3C-3C-3C-3C-3C
20	4D-4D-4D-4D-4D-4D

Figure 1 shows a LAN configured with a Huawei S5700 switch. The switching table is shown in Table 1.

Briefly explain the switch processes based on the following situations.

1) The switch receives a frame at Port 12 with the source address 1A-1A-1A-1A-1A-1A and the destination address 3C-3C-3C-3C-3C-3C.

2) The switch receives a frame at Port 16 with the source address 3C-3C-3C-3C-3C-3C and the destination address FF-FF-FF-FF-FF-FF.

3) Both computers at Port 16 and Port 20 are sending a frame to destination address 1A-1A-1A-1A-1A-1A at the same time.

PC1 1A-1A-1A-1A-1A-1A Port 12 Port 14 Port 16 PC2 2B-2B-2B-2B - 2B-2B S5700 Port 20 PC3 3C-30-3C-30-30-30 PC4 4D-4D-4D-4D-4D-4D Figure 1: A simple LAN configuration