200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ566

Network Fundamentals

Why will a switch flood a frame out all ports?

  • A The frame has zero destination MAC addresses.
  • B The destination MAC address of the frame is unknown.
  • C The source MAC address of the frame is unknown
  • D The source and destination MAC addresses of the frame are the same.
Explanation

A switch floods a frame when it does not have an entry for the frame’s destination MAC address in its MAC address table. In that case, it cannot determine the correct single egress port, so it forwards the frame out all other ports in the same VLAN except the port on which it was received.

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