200-301: Cisco Certified Network AssociateDemo

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QuestionQ1243

Network Fundamentals

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Refer to the exhibit. The complete MAC address table for SW1 is shown here:

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What does SW1 do when Br-4 sends a frame to Br-2?

  • A It performs a lookup in the MAC address table for Br-4 and discards toe frame due to a missing entry.
  • B It floods the frame out or all ports except on the port where Br-2 is connected.
  • C It Inserts the source MAC address and port into the forwarding table and forwards the frame to Br-2.
  • D It maps the Layer 2 MAC address for Fa0/3 to the Layer 3 IP address and towards the frame.
Explanation

An Ethernet switch learns the source MAC address of an incoming frame on the receiving port, adds that source MAC/port mapping to its MAC address table if needed, and then forwards based on the destination MAC address. Because Br-2 already has a learned entry in the table on Fa0/3, SW1 forwards the frame out Fa0/3 after learning Br-4’s source MAC on Fa0/2. Flooding happens only when the destination MAC is unknown.

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