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Network Sales and Services Handbook by Matthew J. Castelli

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Chapter 12. Virtual LAN (VLAN) Introduction

This chapter covers the following topics:

  • VLAN Memberships

  • VLAN/WAN Integration

VLANs create logically separate LANs on the same physical switch. VLANs also can be used to group physically separate LANs so they behave as though they are on the same physical network segment (wire). Each switch port switch is assigned to a VLAN and in the case of the Cisco Catalyst, VLAN operation is performed at Layer-2 (OSI Model Data-Link Layer), requiring a Layer-3 (Network) device (such as a router, to move traffic between VLANs). You configure VLANs through software rather than hardware, which make VLANs flexible in their implementation. The biggest advantage of a VLAN is that when you move a workstation to another ...

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