QuestionQ928

Network Fundamentals

When a switch receives a frame for a destination MAC address that it already knows, how is the frame handled?

  • A flooded to all ports except the one from which it originated
  • B forwarded to the first available port
  • C sent to the port identified for the known MAC address
  • D broadcast to all ports
Explanation

A switch uses its MAC address table to map a known destination MAC address to a specific port. If the destination MAC is present in that table, the switch forwards the frame only out the port associated with that MAC address. Flooding is used for unknown destinations, not for a known unicast destination.

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