200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ594

Network Access

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Refer to the exhibit. The full contents of the MAC address table are shown. Sales-4 sends a data frame to Sales-1.

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What action does the switch take when it receives the frame from Sales-4?

  • A Map the Layer 2 MAC address to the Layer 3 IP address and forward the frame.
  • B Insert the source MAC address and port into the forwarding table and forward the frame to Sales-1.
  • C Perform a lookup in the MAC address table and discard the frame due to a missing entry.
  • D Flood the frame out of all ports except on the port where Sales-1 is connected.
Explanation

An Ethernet switch operates at Layer 2 by learning the source MAC address on the incoming port and using the destination MAC address to consult its MAC address table. Because the table already contains the entry for Sales-1, the switch can forward the frame directly to Sales-1’s port. At the same time, because Sales-4 is the sender and its MAC is not yet shown in the table, the switch adds Sales-4’s source MAC address and ingress port to the forwarding table.

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