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C
HAPTER
8: S
ETTING
U
P
V
IRTUAL
LAN
S
Figure 16
A network setup showing three VLANs
Benefits of VLANs
The main benefit of VLANs is that they provide a network segmentation
system that is far more flexible than any traditional network. Using VLANs
also provides you with three other benefits:
■
VLANs ease the movement of devices on networks
With traditional networks, network administrators spend much of
their time dealing with moves and changes. If users move to a
different subnetwork, the addresses of each endstation must be
updated manually.
With a VLAN setup, if an endstation in VLAN
Marketing
for example is
moved to a port in another part of the network, and retains its original
subnet membership, you only need to specify that the new port is in
VLAN
Marketing
. You do not need to carry out any re-cabling.
■
VLANs provide extra security
Devices within each VLAN can only communicate with other devices in
the same VLAN. If a device in VLAN
Marketing
needs to communicate
with devices in VLAN
Finance
, the traffic must pass through a routing
device or Layer 3 switch.