H12-811_V1.0 Exam Dumps | A switch receives a unicast data frame with a VLAN tag but cannot find the destination MAC address of

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Question 131/132

A switch receives a unicast data frame with a VLAN tag but cannot find the destination MAC address of the data frame in its MAC address table. In this case, which action will the switch take?

A. The switch broadcasts the data frame on all interfaces.

B. The switch broadcasts the data frame on all interfaces (except that on which it was received) in the VLAN to which the data frame belongs.

C. The switch discards the data frame.

D. The switch broadcasts the data frame on all access interfaces.

Correct Answer: B

* Switch Forwarding Behavior:
* If the destination MAC is not found in the MAC address table, the switch floods the frame.
* Broadcasting Within VLANs:
* VLAN tagging ensures the frame remains within its designated VLAN.
* The frame is not sent to all interfaces but only within the VLAN.
* Why Other Options Are Incorrect:
* A: Does not consider VLAN segmentation.
* C: Switches do not discard unknown unicast frames unless configured to do so.
* D: Includes access interfaces only, but flooding happens on all VLAN interfaces.
* Conclusion:
* The switch floods the frame within the VLAN, making the correct answer B.
References: HCIA-Datacom V1.0 Certification Guide, Chapter 4: Switch Forwarding Mechanisms.

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