Host WCF in IIS 7 using net.tcp binding

I am hosting a WCF service in IIS 7 through net.tcp binding. I have two questions about IIS configuration.

1. Can I only configure net.tcp protocol in the the web site containing my service code? All the samples I found so far always append the net.tcp protocol after http protocol.
2. There are two features we can turn on: Windows Communication Foundation Http Activation and Windows Communication Foundation Non-Http Activation. Some sample state that we need to turn on Non-Http activation and others state that both are required to turn on.开发者_开发技巧 My test shows that both are required. However, I do not understand the difference between the two. If only net.tcp protocol is used by my service and client, why should Http Activation be required?

Even if your service is net.tcp the meta data exchange that is used when you add a service reference may be http.

Which tests did you do? If you need more help post your config file.