(3%) Populate the MAC forwarding table for the Ethernet Switches after the follo
ID: 3630413 • Letter: #
Question
(3%) Populate the MAC forwarding table for the Ethernet Switches after the following frame transmissions occur (assume initially that the MAC forwarding table is empty) NOTE: the router is the default gateway for all end devices and performs ARP address resolution. WS-1 sends a packet to WS-2 WS-3 sends a packet to WS-2 WS-3 sends is packed to Server 2 (ARP protocol is used for address resolution) WS-4 sends a packet to Server 2 Server 2 sends a packet to WS-4 Populate the MAC forwarding table for the Ethernet Switches after they have become fully populatedExplanation / Answer
The forwarding table of a switch contains the entries for the destination MAC addresses and the port through which the destination can be reached.
(a)
· WS3 sends a packet to WS2.
WS2 can be reached through port P21. So the destination MAC address at the port P21 is the MAC address of WS2
· WS3 sends a packet to Server 2. It can be reached through port P33. So the MAC address at port P33 is the MAC address of server 2.
Similarly all the port values are determined.
Port
MAC Address
P21
11-22-33-22-22-22
P22
77-88-99-02-02-02
P23
77-88-99-02-02-02
Port
MAC Address
P31
11-22-33-44-44-44
P32
77-88-99-02-02-02
P33
77-88-99-02-02-02
(b)
A fully populated forwarding table contains the entries of MAC addresses of all the devices those can be connected through a specific port.
Port
MAC Address
P21
11-11-33-11-11-11, 11-22-33-22-22-22
P22
99-88-77-01-01-01
P23
11-22-33-33-33-33, 77-88-99-01-01-01
Port
MAC Address
P31
11-22-33-44-44-44
P32
99-99-77-02-02-02
P33
77-88-99-02-02-02
Port
MAC Address
P21
11-22-33-22-22-22
P22
77-88-99-02-02-02
P23
77-88-99-02-02-02
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