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 VLAN.
Correct Answer: B
VLANs are separate broadcast domains, so broadcasts and multicasts never cross between them (rules out D). Ports between switches need to be configured as
trunk ports (rules out C). The VLAN id of a frame arriving on an 802.1q trunk port is determined by the VLAN id in the tag, not by the source MAC address (rules out
A). Unicast frames are only retransmitted on ports that belong to the same VLAN (B).