hem for spanning-tree portfast. Configure one of the core switches to be the spanning tree root bridge, and the other core switch to be the secondary root bridge. See Chapter 8 for additional details. VTP. I'm not a big fan of Virtual Trunking Protocol (VTP), especially for small networks, but even if you don't use it, you'll need to configure a VTP domain name. Trunk ne- gotiation requires the VTP domain to be set properly. See Chapters 5 and 6 for more details. VLANs. How many VLANs will you need? Make sure you plan them all out ahead of time. Here's a list I came up with just by looking at Figure 35-9: Internet Internet inside Server farm Chapter 35: Designing Networks User VLANs Planning ahead of time will save you from having to make last-minute decisions and wasting time. Ecommerce Websites An ecommerce website is one on which goods are sold and money is exchanged, and thus it involves some concerns that don't exist with simple websites. The biggest chal- lenge is security. If you throw together a Linux server and host a simple website on it, you only have to worry about security for the web server. With an ecommerce website, you will probably have multiple web servers. Each of those web servers will probably need to access a database, which should not be accessible from the Internet. In fact, the database shouldn't even be directly accessible from the web servers! Instead, there should be a layer of servers that process requests to the database on the web servers' behalf. This layer of servers is called the application layer. Now you have to worry about security for web servers, application servers, and database servers. Some or all of these servers may need to be load balanced, and all of them will need to be managed. Man- agement can be an interesting challenge because, as I've said, database servers should not be accessible from the Internet. The database servers will contain customer information and possibly credit card data. This information must be protected. Keeping the servers away from the Interne