100-150: Cisco Certified Support Technician (CCST) NetworkingDemo

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QuestionQ39

Network Access

In the network illustrated in the following graphic, Switch1 is a Layer 2 switch.

Question Image

PC-A transmits a frame to PC-C. Switch1 has no MAC address table entry for PC-C's MAC address. What action does Switch1 take?

  • A Switch1 sends an ARP request to obtain the MAC address of PC-C.
  • B Switch1 queries Switch2 for the MAC address of PC-C.
  • C Switch1 drops the frame and sends an error message back to PC-A.
  • D Switch1 floods the frame out all active ports except port G0/1.
Explanation

A Layer 2 switch floods an unknown-unicast frame out all active forwarding ports in the same VLAN except the port on which it arrived. Because the frame entered Switch1 on G0/1 and PC-C's MAC address is unknown to Switch1, Switch1 floods it out its other eligible ports.

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