What does a switch do when it receives a frame whose destination MAC address is missing from the MAC address table?

The correct answer is D. It floods the frame unchanged across all remaining ports in the incoming VLAN.. If the address is in the table, the frame is forwarded out the port associated with the MAC address in the table. When the DESTINATION MAC address is not found in the MAC address table, the switch forwards the frame out of all ports (flooding) except for the ingress port of the f

Submitted by krish.m· Mar 5, 2026Network Fundamentals

Question

What does a switch do when it receives a frame whose destination MAC address is missing from the MAC address table?

Options

AIt changes the checksum of the frame to a value that indicates an invalid frame.
BIt updates the CAM table with the destination MAC address of the frame.
CIt appends the table with a static entry for the MAC and shuts down the port.
DIt floods the frame unchanged across all remaining ports in the incoming VLAN.

How the community answered

(31 responses)

A
6% (2)
C
3% (1)
D
90% (28)

Explanation

If the address is in the table, the frame is forwarded out the port associated with the MAC address in the table. When the DESTINATION MAC address is not found in the MAC address table, the switch forwards the frame out of all ports (flooding) except for the ingress port of the frame.

Topics

#MAC address table#unknown unicast flooding#CAM table#frame forwarding

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