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200-301 · Question #896

Refer to the exhibit. The entire MAC address table for SW1 is shown here: What does SW1 do when Br-4 sends a frame for Br-2?

The correct answer is C. It Inserts the source MAC address and port into the forwarding table and forwards the frame to. When a switch receives a frame, it first learns the source MAC address and then performs a lookup for the destination MAC address to determine the correct egress port for forwarding.

Submitted by dimitri_ru· Mar 5, 2026

Question

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

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

Exhibits

200-301 question #896 exhibit 1
200-301 question #896 exhibit 2
200-301 question #896 exhibit 3
200-301 question #896 exhibit 4

Options

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

How the community answered

(46 responses)
  • A
    2% (1)
  • B
    15% (7)
  • C
    76% (35)
  • D
    7% (3)

Why each option

When a switch receives a frame, it first learns the source MAC address and then performs a lookup for the destination MAC address to determine the correct egress port for forwarding.

AIt performs a lookup in the MAC address table for Br-4 and discards toe frame due to a missing

SW1 has an entry for Br-4 in its MAC address table (Br-4 | Fa0/2 | 1), so it would not discard the frame due to a missing entry for the source MAC.

BIt floods the frame out or all ports except on the port where Br-2 is connected.

The destination MAC address for Br-2 is known in the MAC address table (Br-2 | Fa0/3 | 1). Therefore, the switch will unicast (forward directly to the specific port) the frame, not flood it.

CIt Inserts the source MAC address and port into the forwarding table and forwards the frame toCorrect

When SW1 receives a frame from Br-4 on Fa0/2, it first processes the source MAC address (Br-4) and its associated port (Fa0/2) for learning or refreshing the MAC address table entry. Then, it looks up the destination MAC address (Br-2) in its table, finds it associated with port Fa0/3, and directly forwards the frame out of Fa0/3 to Br-2.

DIt maps the Layer 2 MAC address for Fa0/3 to the Layer 3 IP address and towards the frame.

Switches are Layer 2 devices and forward frames based on MAC addresses. They do not map Layer 2 MAC addresses to Layer 3 IP addresses for forwarding decisions.

Concept tested: Switch MAC address learning and forwarding

Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SXF/configuration/guide/swcg_s/mac_addr.html

Topics

#Ethernet switching#MAC address table#frame forwarding

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