What action takes place when a frame entering a switch has a unicast destination MAC address appearing in the MAC address table?

Last Updated: May 4, 2026
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What action takes place when a frame entering a switch has a unicast destination MAC address appearing in the MAC address table?

  • The switch updates the refresh timer for the entry.
  • The switch forwards the frame out of the specified port.
  • The switch purges the entire MAC address table.
  • The switch replaces the old entry and uses the more current port.

Explanation: During the forwarding stage of switch operation, if the destination MAC address is a unicast address found in the MAC address table, the switch uses the existing entry to direct the frame exclusively out of the associated egress port rather than flooding it. In contrast, actions such as updating refresh timers or replacing entries occur during the learning stage when examining the source MAC address.

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