Assume 4 PCs are connected to switch as shown below table with the given mac add

Question

Assume 4 PCs are connected to switch as shown below table with the given mac address table at switch.

Stations

Mac Address

Connecting Port on Switch

PC1

0198.a9f4.0001

E1

PC2

0198.a9f4.0002

E2

PC3

0198.a9f4.0003

E3

PC4

0198.a9f4.0004

E4

     

            MAC address table at switch

            0198.a9f4.0004                    E4

PC2 transmits a packet to PC4. Which PC(s) will receive this packet? Show the updated mac address table at switch after this transmission. Assume that there is no response after this transmission.

After the transmission PC3 sends a packet to PC2. Which PC(s) will receive this packet? Show the updated mac address table at switch after this transmission. Assume that there is no response after this transmission.

Stations

Mac Address

Connecting Port on Switch

PC1

0198.a9f4.0001

E1

PC2

0198.a9f4.0002

E2

PC3

0198.a9f4.0003

E3

PC4

0198.a9f4.0004

E4

Explanation / Answer

Transmission 1 : PC2 transmits a packet to PC4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Only PC4 receive this packet because its MAC address is already available in the MAC address table and the switch also add PC2 MAC address into the table.

            MAC address table at switch after Transmission 1
        ===============================
            0198.a9f4.0004                           E4
            0198.a9f4.0002                           E2

Transmission 2 : PC3 sends a packet to PC2
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Only PC2 receive this packet because its MAC address is already available in the MAC address table after transmission 1 and the switch also add PC3 MAC address into the table.

            MAC address table at switch after Transmission 2
        ===============================
            0198.a9f4.0004                           E4
            0198.a9f4.0002                           E2
            0198.a9f4.0003                           E3

Note:
    1) When a PC sends a packet the switch will add its MAC address to its MAC address table with the port in which it is connected.
    2) When a packet arrives at a switch, the switch looks for the destination MAC address in its MAC table. If the destination MAC address is found in the table, the packet is only sent out of the appropriate port. However, if the destination MAC address isn’t listed in the MAC table, then the packet will be sent out all active ports, except the port it was received on. If a PC answers the flooded frame, the MAC table is then updated with the corresponding port.

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