Про VTP они тоже пишут в ключе, мол все:
In the days when networks were flat and VLANs stretched end to end, VTP was a convenient administrative tool. VLANs could be created or deleted on all switches in a VTP domain very easily. In this book, you have learned that end-to-end VLANs are not a good idea. Instead, VLANs should be contained within a single switch block or a single access switch.
In such small areas, VTP is not really necessary at all. In fact, Cisco recommends a best practice of configuring all switches in VTP transparent or off mode. You should understand VTP because you might encounter it in an existing network and you should know how to maintain and disable it.