Which statement about bridge groups and VLANs is true?

• A. Bridge groups do not relate to VLANs.
• B. Bridge groups can bind only a single VLAN.
• C. Binding VLANs to a bridge group makes them share a single broadcast domain.
• D. Bridge groups can enable Layer 3 functionality without assigning IPs.

Answer: (C)

Bridge groups create one Layer 2 domain by forwarding traffic between every port and VLAN assigned to the group. When you bind VLANs to the same bridge group, those VLANs are placed into a single shared broadcast domain inside that group. That means broadcast, multicast, and unknown-unicast frames can be seen and forwarded across all bound VLANs without routing, effectively merging their L2 segments within the bridge group.

This is why binding VLANs to a bridge group is the correct concept here: it makes the VLANs share one broadcast domain in that bridging context. VLANs are normally used to keep broadcast domains separate, but binding them to a common bridge group overrides that separation inside the group. If you want to keep VLAN isolation, avoid binding multiple VLANs to the same bridge group or use separate bridge groups for each VLAN. Remember, a bridge group can include more than one VLAN, and bridging is a Layer 2 function; it does not by itself provide Layer 3 routing or IP addresses.