200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ457

Network Access

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Refer to the exhibit. What outcome is expected when PC_A sends data to PC_B after their first communication?

  • A The source MAC address is changed.
  • B The destination MAC address is replaced with ffff.ffff.ffff.
  • C The source and destination MAC addresses remain the same.
  • D The switch rewrites the source and destination MAC addresses with its own.
Explanation

When two hosts are in the same VLAN, the sender uses ARP during the initial exchange to learn the destination host’s MAC address. After that, traffic is sent as a unicast Ethernet frame with the sender’s MAC address as the source and the receiving host’s MAC address as the destination. A switch forwards the frame based on its MAC address table and does not replace those MAC addresses with its own.

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