The switch adds the source MAC address to the MAC address table. Because the destination is not known, the switch forwards the frame out all ports except the port through which the frame arrived.
Refer to curriculum topic: 1.2.1
The first step a switch does when processing a frame is to see if the source MAC address is in the
MAC address table. If the address is not there, the switch adds it. The switch then examines the
destination MAC address and compares it to the MAC address table. If the address is in the table,
the switch forwards the frame out the corresponding port. If the address is missing from the table,
the switch will forward the frame to all ports except the port through which the frame arrived.
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