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3-3

Cisco 1710 Security Router Software Configuration Guide

78-12696-01

Chapter 3 Overview of Routing Between Virtual LANs

What Is a VLAN?

Figure 3-1 LAN Segmentation and VLAN Segmentation

Security

VLANs also improve security by isolating groups. High-security users can be

grouped into a VLAN, possibly on the same physical segment, and no users

outside that VLAN can communicate with them.

Broadcast Control

Just as switches isolate collision domains for attached hosts and only forward

appropriate traffic out a particular port, VLANs provide complete isolation

between VLANs. A VLAN is a bridging domain; all broadcast and multicast

traffic is contained within the VLAN.

Catalyst

VLAN switch

VLAN 1

VLAN segmentationTraditional LAN segmentation

VLAN 2 VLAN 3

LAN 1

Shared hub

Floor 3

Floor 2

Floor 1

LAN 2

LAN 3

S6619

Catalyst

VLAN switch

Catalyst

VLAN switch

Router

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