D-Link DES-3528 - xStack Switch - Stackable Reference Manual page 349

xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide
Table 2 Ethernet Frame Format
When the switch receives the frame, it will check the "Source Address" in the Ethernet frame's header. If the address is
not in its Forwarding Table, the switch will learn PC A's MAC and the associated port into its Forwarding Table.
In addition, when the switch receives the broadcasted ARP request, it will flood the frame to all ports except the source
port, port 1 (see Figure 2).
Figure 2
Figure 3
When PC B replies to the ARP request, its MAC address will be written into "Target H/W Address" in the ARP payload
shown in Table 3. The ARP reply will be then encapsulated into an Ethernet frame again and sent back to the sender.
The ARP reply is in a form of Unicast communication.
Table 3 ARP Payload
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