WCF 4.0 new feature - Default Endpoints

WCF 3.x services required at least one endpoint or you'd get an exception.
WCF 4.0 comes with default endpoints. Windows Communication Foundation (WCF) looks at the configured mappings and decides on which binding to use for a particular based address.
If you have defined at least one endpoint, you won't get default endpoints.

WCF defines a default protocol mapping between transport protocol schemes (e.g., http, net.tcp, net.pipe, etc) and the built-in WCF bindings. The default protocol mapping is found in the .NET 4 machine.config.comments file and it looks like this:

<protocolMapping>
    <add scheme="http" binding="basicHttpBinding"/>
    <add scheme="net.tcp" binding="netTcpBinding"/>
    <add scheme="net.pipe" binding="netNamedPipeBinding"/>
    <add scheme="net.msmq" binding="netMsmqBinding"/>
</protocolMapping>