The number of devices on the shared broadcast domain will have an impact on the performance of your network. Hosts on the network are continually sending out broadcasts on discover other hosts on the local network segment. Broadcasts are a necessary evil on your networks, without them your hosts would and could not discover the layer 2 addresses of other machines on the local LAN.

This is where you start to consider implementing vlans on your network. With vlans operating on your networks you can control the scope or range of the broadcast and contain it and prevent it from affecting all host across your lans.

Not only can you prevent broadcasts from unnecessarily interrupting hosts you also use vlans to group hosts with similar functions into a common vlan for the purposes of security. Once a Host is on a vlan it is protected from seeing or being seen by devices on other vlans, even of the host on other vlan is on the next port along. Using vlans allows us to logical partition your switches. lua.



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