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Appendix A

Introduction to Virtual LANs

A virtual LAN (VLAN) is a group of end nodes that function as if they are a

part of the same LAN segment. A VLAN can consist of end nodes located

in one specific area of a network or of end nodes that are widely

dispersed. This flexibility allows you to form logical workgroups of end

nodes located anywhere on your network.

A VLAN constitutes a broadcast domain. A VLAN restricts the

transmission of broadcasts only to the end nodes that are members of

the same VLAN. Members of a VLAN can communicate directly with

other members of the same VLAN. If an end node needs to communicate

with a member of another VLAN, a routing device or a Layer 3 switch is

required.

There are a number of advantages to VLANs:

❑ Improve network performance

—

Grouping end nodes with

related functions in the same virtual LAN can reduce the amount

of data traffic on each segment.

❑ Improve network security

—

When networking devices, such as

workstations and servers, are grouped into a VLAN, data is

exchanged only between those members of the group. This can

help to limit unauthorized access to restricted data and network

devices.

❑ Simplify network management

—

Moving network devices

between LAN segments can be accomplished through software

management, without having to move the devices physically or

having to rewire connections to switches in the wiring closet.

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Allied-telesis AT-S25 Manual de usuario Pagina 139