A is not the same as B.
When you create a VLAN on a switch and you send a broadcast into one of them, this broadcast will reach only on the members of the respective VLAN (which this switch belongs), not on all members of all the VLANs.
Recall: Each VLAN is typically its own broadcast domain.
When a switch receives a frame with a destination MAC address that is not in its MAC address table (because it has aged out), the switch will flood the frame to all ports within the same VLAN, except the port that received the frame. This process is used to locate the destination device so that it can update the MAC address table with the correct port for future frames.
When the switch receives a frame for a destination MAC address which isn't listed in its CAM table, it floods the frame to all LAN ports of the "same VLAN", except the port where it received the frame. So, the option "B" is correct.
When the switch receives a frame for a MAC destination address not listed in its CAM table, it floods the frame to all LAN ports of the "same VLAN" except the port that received the frame. So, the option B is correct.
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