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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Chapter 30. LAN Switching and VLANs

Objectives

  • Understand the relationship of LAN switching to legacy internetworking devices such as bridges and routers.

  • Understand the advantages of VLANs.

  • Know the difference between access and trunk links.

  • Know the purpose of a trunk protocol.

  • Understand Layer 3 switching concepts.

A LAN switch is a device that provides much higher port density at a lower cost than traditional bridges. For this reason, LAN switches can accommodate network designs featuring fewer users per segment, thereby increasing the average available bandwidth per user. This chapter provides a summary of general LAN switch operation and maps LAN switching to the OSI reference model.

The trend toward fewer users per segment is known as microsegmentation ...

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