The previous chapter introduced you to the world of LAN switching. We discussed switching loops and their negative impact on network performance while learning several techniques to prevent those loops using dynamic methods. We are now all set to explore the more interesting enhanced switching technologies including: VLANs, ISL and 802.1q trunking, VLAN trunking protocol (VTP), inter-VLAN routing, and Voice VLANs. By the time you finish this chapter, you will be armed with all the information you need to configure, verify, and troubleshoot these technologies on your Cisco Certified Network Associate (CCNA) exam as well as the real world. Please note that the examples in this chapter were created on Cisco 3550 and Cisco 3560 switches.