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Chapter 6
Virtual LANs (VLANs)
As a logical grouping of users by function, VLANs can be consid-
ered independent from their physical or geographic locations.
VLANs can enhance network security.
VLANs increase the number of broadcast domains while decreas-
ing their size.
Remember to check a switch port's VLAN assignment when plugging in
a new host. If you plug a new host into a switch, then you must verify
the VLAN membership of that port. If the membership is different than
what is needed for that host, the host will not be able to reach the needed
network services, such as a workgroup server.
Key Terms
B
e sure you're familiar with the following terms before taking the exam:
There are no hands-on labs associated with this chapter. Please see the compan-
ion CD or www.routersim.com for programs that provides practice in configuring
switches and VLANs.
access link
pruning
broadcast domain
static VLAN
collision domain
switch fabric
dynamic VLAN
trunk link
flat network
virtual LAN (VLAN)
frame tagging
VLAN Trunk Protocol (VTP)
ISL routing
VTP transparent mode
native VLAN
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