Summary Points
Building a big physical LAN can pay off in equipment savings and in the capability to include high-bandwidth backbone links.
Broadcasts and flooded unicast frames can generate a lot of LAN traffic.
Virtual LANs were introduced as a way to control the traffic flows on a physical LAN.
Systems that support VLAN protocols are said to be VLAN-aware.
VLANs can be used to confine traffic within a workgroup, give selected stations access to a server, carry data for specified protocols, or isolate traffic for reasons of security.
A VLAN can be defined by listing switch ports that participate in the VLAN.
A link between a pair of VLAN switches is called a trunk. Traffic belonging to several VLANs can share a trunk.
A link that connects one or ...
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