No Forwarding Between the Two Physical LANs

With two separate switches, you can create two physical LANs, each with its own MAC address table. In the next section, you'll read about how VLANs can do essentially the same thing, but using only a single switch. Following are some key points about physical LANs that will help you as you learn about VLANs in the next section:

• Each LAN has an independent MAC address table as compared to the other LANs.

• Broadcasts originating in one LAN are flooded inside that LAN.

• Broadcasts originating in one LAN are not forwarded into the other LANs.

• Unicasts originating in one LAN are not forwarded into the other LANs.