Summary

Now that you have completed this chapter, you should have a firm understanding of the following concepts:

  • VLANs solve many of the issues found in Layer 2 environments. These issues include broadcast control, isolation of problem components in the network, security, and load balancing through the use of a Layer 3 protocol between VLANs.

  • VLAN identification allows different VLANs to be carried on the same physical link, called a trunk link. There are two different types of frame identification methods: ISL and 802.1Q.

  • The VLAN Trunking Protocol provides support for dynamic reporting of the addition, deletion, and renaming of VLANs across the switch fabric.

  • The overwrite process would mean that if the server deleted all VLANs and had a higher configuration revision number, the other devices in the VTP domain would also delete their VLANs.