Let's look at the example in Figure 2. PC2 sends a broadcast frame with destination MAC address FF-FF-FF-FF-FF-FF. When Switch1 gets the frame, it looks at the Ethernet header and sees based on the MAC address that this is a broadcast, so it floods it out all its port, except the port, it was received on. So the frame goes out the link towards Switch2. When Switch2 receives the frame, it does the same thing as switch1. It understands based on the MAC addresses that this is a broadcast frame and floods it out all its ports. Eventually, the frame goes to every connected device in the LAN. Therefore all devices are in one broadcast domain.

This logic applies to LANs with many switches. If we connect another switch to the topology in Figure 2, the broadcast domain will be extended across the new switch, and so on.

#BroadcastDomainManagement#SwitchTopology#NetworkSegmentation#MultiSwitchTopology#SwitchInfrastructure#BroadcastDomainScalability#SwitchCascade#BroadcastDomainIsolation#SwitchBroadcastControl#NetworkExpansion#BroadcastDomainRouting#SwitchRedundancy#MultiSwitchArchitecture
#BroadcastDomainConnectivity#InterconnectedSwitches
#SwitchNetworking#MultiSwitchNetworking#SwitchInterconnection