What action takes place when the source MAC address of a frame entering a switch is in the MAC address table?

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

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

Explanation: Every frame entering a switch is checked for new information. If the source MAC address is already present in the MAC address table, the switch simply updates the refresh timer for that entry to prevent it from aging out and being deleted. If the address exists in the table but appears on a different port, the switch will then update the entry with the more current port number.

Related exam: Switching, Routing, and Wireless Essentials (Version 7.00) - SRWE Final Exam
Related exam: CCNA (200-301) Certification Practice Exam (ENSA v7.0)

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