Summary

This module described VLANs and how their implementation can benefit network management and troubleshooting while improving network performance. When VLANs are created, their names and descriptions are stored in a VLAN database that can be shared between switches. Design considerations were identified that determine which VLANs will be End-to-End and which VLANs will remain local to a switch block. The use of trunking protocols such as ISL and 802.1Q were covered. These allow individual switch ports to carry traffic for one or more VLANs. Access ports allow connection of hubs, servers and end-user devices. This module explained both why and how VLAN implementation occurs in an enterprise network. The function and configuration of the VLAN Trunking Protocol (VTP) was covered along with the process of adding a new switch to an existing network LAN.