What action takes place when the source MAC address of a frame entering a switch is not in the MAC address table?
- The switch forwards the frame out of the specified port.
- The switch will forward the frame out all ports except the incoming port.
- The switch adds the MAC address and incoming port number to the table.
- The switch adds a MAC address table entry mapping for the destination MAC address and the ingress port.
Case 2:
- The switch adds a MAC address table entry for the destination MAC address and the egress port.
- The switch adds the MAC address and incoming port number to the table.
- The switch replaces the old entry and uses the more current port.
- The switch updates the refresh timer for the entry.
Explanation: Every frame that enters a switch is checked for new information during the learning process. If the switch examines the source MAC address and finds it does not exist in the MAC address table, it adds that MAC address along with the incoming (ingress) port number to the table. This allows the switch to populate its database so it can efficiently forward future frames destined for that specific device.
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