200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ1374

Network Fundamentals

How does MAC learning operate on a switch?

  • A broadcasts frames to all ports without queueing
  • B sends an ARP request to locate unknown destinations
  • C adds unknown source MAC addresses to the address table
  • D sends a retransmission request when a new frame is received
Explanation

A switch learns MAC addresses by reading the source MAC address of each received frame and recording that address in its MAC address table along with the ingress port. That learned mapping is then used to forward later frames more efficiently to the correct port.

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