What action takes place when the source MAC address of a frame entering a switch appears in the MAC address table associated with a different port?

Last Updated: May 6, 2026
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What action takes place when the source MAC address of a frame entering a switch appears in the MAC address table associated with a different port?

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

Explanation: During the learning process, if a switch receives a frame and discovers that the source MAC address already exists in its MAC address table but is associated with a different port, it treats this as a location change for that device. The switch then replaces the old entry with the more current port number and updates the refresh timer to maintain accurate forwarding information.

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