Understanding VLANs
At the Ethernet layer, you can partition your network using VLANs. These VLANs limit the
scope of broadcast traffic on your network because each VLAN represents an individual
broadcast domain. By dividing your switched network using VLANs, you improve the
security of your network by limiting the scope of broadcast traffic that is vital for the
operation of your network, such as Address Resolution Protocol (ARP) traffic and Dynamic
Host Configuration Protocol (DHCP) traffic.