"To begin, we must have a more formal definition of what a LAN
is. LAN stands for local area network. Hubs and switches usually
are thought of as participating in a single LAN. Normally, if you
connect two computers to the same hub or switch, they are on the
same LAN. Likewise, if you connect two switches together, they are
both on the same LAN.
"A LAN includes all systems in the broadcast domain. That is,
all of the systems on a single LAN receive a broadcast sent by any
member of that LAN. By this definition, a LAN is bordered by
routers or other devices that operate at OSI Layer 3.
"Now that we've defined a LAN, what is a VLAN? VLAN stands for
virtual LAN. A single VLAN-capable switch is able to participate in
multiple LANs at once..."
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