Which statement about VLAN operation on CISCO Catalyst switches is true?

A. When a packet is received from an 802.1Q trunk, the VLAN ID can be determined from the source MAC address table.
B. Unknown unicast frames are retransmitted only to the ports that belong to the same VLAN.
C. Ports between switches should be configured in access mode so that VLANs can span across the ports.
D. Broadcast and multicast frames are retransmitted to ports that are configured on different VLANs.

Asked by Adrian, Last updated: Apr 02, 2024

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1 Answer

John Smith

Answered Sep 09, 2016

Unknown unicast frames are retransmitted only to the ports that belong to the same vlan.
Answer A is not correct because when a packet is received from an 802.1Q trunk, it always carries VLAN ID information in the VLAN tag portion so the switch does not need to look up its source MAC address table to determine the VLAN ID of that packet.