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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 5: Virtual Local Area Networks (VLANs)

Exam Objectives

Describing the purpose and implications of VLANs

Describing the benefits of using VLANs

Creating and managing VLANs

Identifying VLANs using Cisco ISL and IEEE 802.1q frame tagging

Creating and managing VLAN port trunks

Creating and managing EtherChannel logical ports

Understanding the difference between Port Aggregation Protocol (PAgP) and Link Aggregation Control Protocol (LACP)

Understanding the difference between a VLAN port trunk and an EtherChannel logical port

Creating and managing VLAN port trunk over EtherChannel logical port

Managing switch port types: access ports and trunk ports

Managing VLAN port trunks using the Dynamic Trunking Protocol (DTP)

Managing the VLAN Trunking Protocol (VTP)

Managing inter-VLAN routing

VLANs are an important feature that allows you to subdivide a LAN into several logical (virtual) LANs (VLANs) using the same physical equipment. In other words, you could have some devices communicate within one virtual LAN and other devices communicate within another virtual LAN on the same cables, switches, and routers. You can identify and separate network traffic for different purposes on any given network using VLANs. The nice thing about VLANs is that you don’t need to have separate physical networks to separate traffic within the LAN.

VLANs also limit the broadcast domain. Switches do not limit broadcast domains. A broadcast frame sent on a Layer 2 switch will reach every host and network ...

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