H/W
type
Protocol
type
H/W
address
length
Protocol
address
length
Operation
ARP reply
Sender
H/W address
00-20-5C-01-11-11
Sender
protocol
address
10.10.10.1
Target
H/W address
00-20-5C-01-22-22
Target
protocol
address
10.10.10.2
Table – 3 (ARP Payload)
When PC B replies to the query, “Destination Address” in the Ethernet frame it will change to PC A’s MAC address. The “Source
Address” will be changed to PC B’s MAC address (see Table-4).
Destination address
00-20-5C-01-11-11
Source address
00-20-5C-01-22-22
Ether-type ARP FCS
Table – 4 (Ethernet frame format)
The switch will also examine the “Source Address” of the Ethernet frame and if it finds that the address is not in the Forwarding
Table, the switch will learn PC B’s MAC and update its Forwarding Table.
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